1923 Ohio state highway renumbering
# 1923 Ohio state highway renumbering

This article is part of the highway renumbering series. :

| Alabama | 1928, 1957 |
| - | - |
| Arkansas | 1926 |
| California | 1964 |
| Colorado | 1953, 1968 |
| Connecticut | 1932, 1963 |
| Florida | 1945 |
| Indiana | 1926 |
| Iowa | 1926, 1969 |
| Louisiana | 1955 |
| Maine | 1933 |
| Massachusetts | 1933 |
| Minnesota | 1934 |
| Missouri | 1926 |
| Montana | 1932 |
| Nebraska | 1926 |
| Nevada | 1976 |
| New Jersey | 1927, 1953 |
| New Mexico | 1988 |
| New York | 1927, 1930 |
| North Carolina | 1934, 1937, 1940, 1961 |
| Ohio | 1923, 1927, 1962 |
| Pennsylvania | 1928, 1961 |
| Puerto Rico | 1953 |
| South Carolina | 1928, 1937 |
| South Dakota | 1927, 1975 |
| Tennessee | 1983 |
| Texas | 1939 |
| Utah | 1962, 1977 |
| Virginia | 1923, 1928, 1933, 1940, 1958 |
| Washington | 1964 |
| Wisconsin | 1926 |
| Wyoming | 1927 |
| This box: viewtalkedit ||

In 1923, Ohio renumbered almost all of its state highways in order to simplify the system.

| Old | New | Now | From | To |
| - | - | - | - | - |
| 1 National Road | State Route 1 | US 40 | Indiana | Pennsylvania |
| 2 Cleveland-Buffalo Road | State Route 2 | US 20 | Cleveland | Pennsylvania |
| 3 Cleveland-Sandusky Road | State Route 12 | US 6 | Cleveland | Sandusky |
| 4 Columbus-Sandusky Road | State Route 4 | US 23 | Columbus | Waldo |
| 4 Columbus-Sandusky Road | State Route 98 | SR 98 | Waldo | Bucyrus |
| 4 Columbus-Sandusky Road | State Route 4 | SR 4 | Bucyrus | Sandusky |
| 5 Portsmouth-Columbus Road | State Route 4 | US 23 | Portsmouth | Columbus |
| 6 Columbus-Cincinnati Road | State Route 28 | SR 142, US 42 | West Jefferson | Sharonville |
| 7 Ohio River Road | State Route 7 | US 52, SR 7 | Cincinnati | Pomeroy |
| 7 Ohio River Road | State Route 144 | SR 124 | Hockingport | Little Hocking |
| 7 Ohio River Road | State Route 7 | SR 7 | Little Hocking | East Liverpool |
| 7 Ohio River Road | State Route 5 | SR 39 | East Liverpool | Pennsylvania |
| 8 Cincinnati-Chillicothe Road | State Route 27 | US 50, SR 28 | Cincinnati | Chillicothe |
| 9 Milford-Hillsboro Road | State Route 26 | US 50 | Milford | Hillsboro |
| 10 Cincinnati-Zanesville Road | State Route 3 | SR 3/US 22 | Cincinnati | Washington Court House |
| 10 Cincinnati-Zanesville Road | State Route 40 | US 22 | Washington Court House | Zanesville |
| 11 Toledo-Detroit Road | State Route 6 | US 25 (former) | Toledo | Michigan |
| 12 Cleveland-East Liverpool Road | State Route 14 | SR 14 | Cleveland | Salem |
| 12 Cleveland-East Liverpool Road | State Route 45 | SR 45 | Salem | Lisbon |
| 12 Cleveland-East Liverpool Road | State Route 5 | US 30 | Lisbon | East Liverpool |
| 13 Youngstown-Conneaut Road | State Route 7 | SR 7 | Hubbard | Conneaut |
| 14 Youngstown-Lowellville Road | State Route 18 | SR 289 | Youngstown | Pennsylvania |
| 15 Cleveland-Meadville Road | State Route 15 | US 322 | Cleveland | Pennsylvania |
| 16 Akron-Cleveland Road | State Route 8 | SR 8 | Akron | Cleveland |
| 17 Cleveland-Massillon Road | State Route 13 | SR 21 | Cleveland | Massillon |
| 18 Akron-Youngstown Road | State Route 18 | SR 18 (former) | Akron (east of) | Youngstown |
| 19 Cincinnati-Dayton Road | State Route 28 | US 42 | Cincinnati | Sharonville |
| 19 Cincinnati-Dayton Road | State Route 124 | US 25 (former) | Sharonville | Franklin |
| 19 Cincinnati-Dayton Road | State Route 6 | US 25 (former) | Franklin | Dayton |
| 20 Toledo-Wauseon Road | State Route 2 | SR 2 | Toledo | Wauseon |
| 21 Toledo-Angola Road | State Route 23 | US 20, SR 120 | Toledo | Indiana |
| 22 Lima-Sandusky Road | State Route 6 | US 25 (former) | Lima | Findlay |
| 22 Lima-Sandusky Road | State Route 12 | SR 12, US 6 | Findlay | Sandusky |
| 23 Columbus-Millersburg Road | State Route 19 | US 62 | Columbus | Millersburg |
| 24 Columbus-Wooster Road | State Route 3 | SR 3 | Columbus | Wooster |
| 25 Cleveland-Wooster Road | State Route 3 | SR 3, US 42 | Cleveland | Wooster |
| 26 Steubenville-Cambridge Road | State Route 49 | US 22 | Steubenville | Cambridge |
| 27 Dayton-Lakeview Road | State Route 201 | SR 201 | Dayton | Brandt |
| 27 Dayton-Lakeview Road | State Route 69 | SR 235 | East of Brandt | Lakeview |
| 28 Dayton-Indianapolis Road | State Route 11 | US 35 | Dayton | Eaton |
| 28 Dayton-Indianapolis Road | State Route 122 | SR 122 | Eaton | Indiana |
| 29 Dayton-Chillicothe Road | State Route 11 | US 35 | Dayton | Chillicothe |
| 30 Cincinnati-West Union Road | State Route 25 | SR 125 | Cincinnati | West Union |
| 31 Cleveland-Elyria Road | State Route 2 | US 20 | Cleveland | Elyria |
| 32 Cleveland-Hinckley-Medina Road | State Route 55 | SR 94, SR 3 | Cleveland | Medina |
| 33 Cleveland-Burton Road | State Route 16 | US 422 | Cleveland | Chagrin Falls (west of) |
| 33 Cleveland-Burton Road | State Route 87 | SR 87 | Chagrin Falls (west of) | Burton |
| 34 Euclid-Chardon Road | State Route 85 | US 6 | Euclid | Chardon |
| 35 Chagrin Falls-Greenville Road | State Route 16 | US 422 | Chagrin Falls (west of) | Parkman |
| 35 Chagrin Falls-Greenville Road | State Route 87 | SR 88 | Parkman | Pennsylvania |
| 36 Twinsburg-Elyria Road | State Route 81 | SR 82 | Twinsburg | Elyria (south of) |
| 37 Rocky River-Berea Road | State Route 232 | SR 237, Eastland Road, Fowles Road | Rocky River | Berea (east of) |
| 38 Cincinnati-Louisville Road | State Route 7 | SR 264, US 50 | Cincinnati | Indiana |
| 39 Cincinnati-Hamilton Road | State Route 9 | US 127 | Cincinnati | Hamilton |
| 40 Cincinnati-Brookville Road | State Route 129 | US 27, SR 126 | Cincinnati | Indiana |
| 41 Cincinnati-Batavia Road | State Route 74 | SR 32 | Cincinnati | Batavia |
| 42 Harrison Road | State Route 130 | US 52 | Cincinnati | Indiana |
| 43 Carthage-Hamilton Road | State Route 6 | SR 4 | Carthage | Hamilton |
| 44 Hamilton-Cleves Road | State Route 128 | SR 128 | Hamilton | Cleves |
| 45 Dunlap-Springdale Road | State Route 26 | SR 126 | Dunlap | Springdale |
| 46 Glendale-Milford Road | State Route 26 | SR 126 | Glendale | Milford |
| 47 Columbus-Newark Road | State Route 20 | SR 16 | Columbus | Newark |
| 48 Columbus-Marysville Road | State Route 21 | US 33 | Columbus | Marysville |
| 49 Columbus-Lancaster Road | State Route 21 | US 33 | Columbus | Lancaster |
| 50 Columbus-Washington Court House Road | State Route 3 | SR 3/US 62 | Columbus | Washington Court House |
| 51 Toledo-Napoleon Road | State Route 31 | US 24 | Toledo | Napoleon |
| 52 Toledo-Elmore Road | State Route 2 | SR 51 | Toledo | Southeast of Woodville |
| 53 Toledo-Perrysburg Road | State Route 6 | SR 65 | Toledo | Perrysburg |
| 53 Toledo-Perrysburg Road | State Route 110 | SR 65 | Perrysburg | Grand Rapids |
| 54 Toledo-Lansing Road | State Route 112 | SR 51 | Toledo | Michigan |
| 55 Toledo-Ann Arbor Road | State Route 183 | SR 246, Secor Road | Toledo | Michigan |
| 56 Jerusalem Road | State Route 23 | SR 2 | Toledo | Bono |
| 57 Perrysburg-Holland Road | State Route 102 | US 20, Perrysburg Holland Road | Perrysburg | Holland |
| 58 Holland-Sylvania Road | State Route 63 | US 20, Holland Sylvania Road | Southeast of Holland | Sylvania |
| 59 Waterville-Swanton Road | State Route 64 | SR 64 | Waterville | Swanton |
| 60 Dayton-Springfield Road | State Route 52 | SR 4 | Dayton | Springfield |
| 61 Dayton-Troy Road | State Route 6 | US 25 (former) | Dayton | Troy |
| 62 Dayton-Greenville Road | State Route 51 | SR 49 | Dayton | Greenville |
| 63 Dayton-Covington Road | State Route 50 | SR 48 | Dayton | Covington (north of) |
| 64 Dayton-Lebanon Road | State Route 50 | SR 48 | Dayton | Lebanon |
| 65 Dayton-Germantown Road | State Route 52 | SR 4 | Dayton | Germantown |
| 66 Akron-Canton Road | State Route 8 | SR 8 (former) | Akron | Canton |
| 67 Canton-Alliance Road | State Route 44 | US 62 | Canton | Louisville (north of) |
| 67 Canton-Alliance Road | State Route 19 | US 62, SR 193 (former) | Louisville (north of) | Alliance |
| 68 Canton-Massillon Road | State Route 5 | SR 172 | Canton | Massillon |
| 69 Massillon-Wooster Road | State Route 5 | US 30, SR 172 | Massillon | Wooster |
| 70 Canton-Canal Dover Road | State Route 8 | SR 800 | Canton | New Philadelphia |
| 71 Akron-Massillon Road | State Route 93 | SR 93, SR 236 | Akron | Massillon |
| 72 Canton-New Franklin Road | State Route 5 | SR 172 | Canton | Osnaburg |
| 72 Canton-New Franklin Road | State Route 172 | SR 172 | Osnaburg | New Franklin |
| 73 Canton-Louisville Road | State Route 19 | SR 153 | Canton | Louisville |
| 74 Ravenna-Louisville Road | State Route 44 | SR 44 | Ravenna | Louisville (north of) |
| 74 Ravenna-Louisville Road | State Route 19 | SR 44 | Louisville (north of) | Louisville |
| 75 Canton-Steubenville Road | State Route 43 | SR 43 | Canton | Waynesburg |
| 75 Canton-Steubenville Road | State Route 171 | SR 171 | Waynesburg | Carrollton |
| 75 Canton-Steubenville Road | State Route 43 | SR 43 | Carrollton | Steubenville |
| 76 Alliance-Yale Road | State Route 80 | SR 225 | Alliance | East of Atwater Center |
| 76 Alliance-Yale Road | State Route 225 | SR 225 (former) | East of Atwater Center | Yale |
| 77 Massillon-Canal Dover Road | State Route 13 | SR 21 | Massillon | Northwest of Strasburg |
| 78 Alliance-Minerva Road | State Route 80 | SR 183 | Alliance | Minerva |
| 79 Navarre-Berlin Road | State Route 19 | US 62 | Navarre | Berlin |
| 80 Youngstown-Warren Road | State Route 16 | US 422 | Youngstown | Girard |
| 80 Youngstown-Warren Road | State Route 169 | US 422 | Girard | Warren |
| 81 Youngstown-Salem Road | State Route 19 | US 62 | Youngstown | Salem |
| 82 Youngstown-Lisbon Road | State Route 164 | SR 164, SR 7 | Youngstown | Lisbon |
| 83 Pittsburg-Youngstown Road | State Route 90 | SR 170, SR 617 | Pennsylvania | Youngstown |
| 84 Alliance-Salem Road | State Route 19 | US 62, SR 173 (former) | Alliance | Salem |
| 85 Youngstown-New Bedford Road | State Route 16 | US 422 | Youngstown | Pennsylvania |
| 86 Salem-Unity Road | State Route 14 | SR 14 | Salem | Unity |
| 86 Salem-Unity Road | State Route 170 | SR 14 | Unity | Pennsylvania |
| 87 Akron-Canfield Road | State Route 17 | US 224 | Akron | Canfield |
| 88 Niles-Warren Road | State Route 16 | SR 169 | Girard | Warren |
| 89 North Lima-East Palestine Road | State Route 165 | SR 165 | North Lima | Unity |
| 89 North Lima-East Palestine Road | State Route 14 | SR 165 | Unity | East Palestine |
| 90 Chagrin Falls-Willoughby Road | State Route 174 | SR 174 | Chagrin Falls | Willoughby |
| 91 Cuyahoga Falls-Chagrin Falls Road | State Route 91 | SR 91 | Cuyahoga Falls | Solon |
| 91 Cuyahoga Falls-Chagrin Falls Road | State Route 174 | SR 174 (former) | Solon | Chagrin Falls |
| 92 Akron-Cuyahoga Falls Road | State Route 36 | SR 59 | Akron | Cuyahoga Falls |
| 93 Cuyahoga Falls-Kent Road | State Route 36 | SR 59 | Cuyahoga Falls | Kent |
| 94 Akron-Kent Road | State Route 36 | SR 261 | Akron | Kent |
| 95 Akron-Medina Road | State Route 18 | SR 18 | Akron | Medina |
| 96 Akron-Wooster Road | State Route 36 | SR 585 | Akron | Wooster |
| 97 Barberton-Greenwich Road | State Route 17 | US 224 | Barberton | Chicago Junction |
| 98 Ghent Road | State Route 92 | SR 176 (former) | Northwest of Akron | Ghent |
| 99 High Ridge-Bellaire Road | State Route 214 | SR 214 (former) | St. Clairsville (east of) | Bellaire |
| 100 Bridgeport-Cadiz Road | State Route 13 | US 250 | Bridgeport | Cadiz |
| 101 Barnesville-Hendrysburg Road | State Route 48 | SR 800 | Barnesville | Hendrysburg |
| 102 Cadiz-St. Clairsville Road | State Route 35 | SR 9 | Cadiz | St. Clairsville |
| 103 New Athens-Morristown Road | State Route 149 | SR 149 | New Athens | Morristown |
| 104 Barnesville-Woodsfield Road | State Route 48 | SR 800 | Barnesville | Woodsfield |
| 105 Barnesville-Powhatan Road | State Route 148 | SR 148 | Barnesville | Powhatan Point |
| 106 St. Clairsville-Armstrong Mills Road | State Route 35 | SR 9 | St. Clairsville | Armstrongs Mills |
| 107 Cambridge-Barnesville Road | State Route 148 | SR 265 | Cambridge | Barnesville |
| 108 Malaga-Alledonia Road | State Route 35 | SR 145 | Malaga | Alledonia |
| 109 Marion-Waldo Road | State Route 4 | SR 423 | Marion | Waldo |
| 110 Marion-Bucyrus Road | State Route 4 | SR 4 | Marion | Bucyrus |
| 111 Marion-Mount Gilead Road | State Route 42 | SR 95 | Marion | Mount Gilead |
| 112 Marion-Kenton Road | State Route 10 | SR 309 | Kenton | Marion |
| 113 Marion-Upper Sandusky Road | State Route 22 | US 23, SR 199, SR 423 | Marion | Upper Sandusky |
| 114 Marion-Galion Road | State Route 10 | SR 309 | Marion | Galion |
| 115 Marysville-Marion Road | State Route 38 | SR 4 | Marysville | Marion |
| 116 Delaware-Prospect Road | State Route 203 | SR 203 | Delaware | North of Prospect |
| 117 Richwood-Larue Road | State Route 47 | SR 37 | South of Richwood | LaRue |
| 118 Larue-Marseilles Road | State Route 47 | SR 37 | LaRue | Marseilles |
| 119 West Union-Portsmouth Road | State Route 25 | SR 125 | West Union | Portsmouth (west of) |
| 120 West Union-Bradysville Road | State Route 41 | SR 41, SR 136 | West Union | Manchester |
| 121 West Union-Wrightsville Road | State Route 137 | SR 247 | West Union | Wrightsville |
| 122 West Union-Belfast Road | State Route 137 | SR 247, SR 785 | West Union | Belfast |
| 123 Hillsboro-Portsmouth Road | State Route 73 | SR 73 | Hillsboro | Portsmouth (north of) |
| 124 West Union-Sinking Spring Road | State Route 41 | SR 41 | West Union | Bainbridge |
| 125 Batavia-Winchester Road | State Route 74 | SR 32 | Batavia | South of Seaman |
| 126 Lima-Wapakoneta Road | State Route 6 | US 25 (former) | Lima | Wapakoneta |
| 127 Lima-Delphos Road | State Route 10 | SR 309 | Lima | Delphos |
| 128 Lima-Kenton Road | State Route 10 | SR 309 | Lima | Kenton |
| 129 Lima-Ottawa Road | State Route 33 | SR 65 | Lima | Ottawa |
| 130 Lima-Bellefontaine Road | State Route 117 | SR 117 | Lima | North of Huntsville |
| 130 Lima-Bellefontaine Road | State Route 32 | US 33 | North of Huntsville | Bellefontaine |
| 131 Delphos-St. Marys Road | State Route 66 | SR 66 | Delphos | St. Marys |
| 132 Lima-Spencerville Road | State Route 117 | SR 117 | Lima | Conant |
| 132 Lima-Spencerville Road | State Route 116 | SR 117 | Conant | Spencerville |
| 133 Findlay-Delphos Road | State Route 106 | SR 12 | Findlay | Vaughnsville |
| 133 Findlay-Delphos Road | State Route 189 | SR 12 (former) | Vaughnsville | Gomer |
| 133 Findlay-Delphos Road | State Route 5 | US 30 | Gomer | Delphos |
| 134 Kalida-Lima Road | State Route 115 | SR 115 | Kieferville | Lima |
| 135 Van Wert-Spencerville Road | State Route 116 | SR 116, SR 117 | Van Wert | Spencerville |
| 136 Delphos-Wapakoneta Road | State Route 117 | SR 198 (former) | Delphos (south of) | Conant |
| 136 Delphos-Wapakoneta Road | State Route 116 | SR 198 | Conant | Wapakoneta |
| 137 Delphos-Kalida Road | State Route 106 | SR 190 | Delphos | Fort Jennings |
| 137 Delphos-Kalida Road | State Route 190 | SR 190 | Fort Jennings | West of Kalida |
| 138 Bluffton-Carey Road | State Route 103 | SR 103 | Bluffton | Carey |
| 139 Ashland-Medina Road | State Route 55 | US 42 | Ashland | Medina |
| 140 Mansfield-Ashland Road | State Route 5 | US 42 | Mansfield | Ashland |
| 141 Ashland-Wooster Road | State Route 5 | US 250 | Ashland | Wooster |
| 142 Ashland-Norwalk Road | State Route 60 | SR 60/US 250 | Ashland | Savannah |
| 142 Ashland-Norwalk Road | State Route 180 | US 250 | Savannah | Fitchville |
| 142 Ashland-Norwalk Road | State Route 30 | SR 13/US 250 | Fitchville | Norwalk |
| 143 Ashland-Loudonville Road | State Route 60 | SR 60 | Ashland | Loudonville |
| 144 Ashland-Oberlin Road | State Route 96 | SR 58 | Ashland | South of Sullivan |
| 144 Ashland-Oberlin Road | State Route 58 | SR 58 | South of Sullivan | Oberlin |
| 145 Mansfield-Millersburg Road | State Route 39 | SR 39 | Mansfield | Millersburg |
| 146 Mansfield-Wooster Road | State Route 10 | US 30, SR 430 | Mansfield | Wooster |
| 147 Hayesville-Nashville Road | State Route 179 | SR 179 | Hayesville | Nashville |
| 148 Ashland-Shelby Road | State Route 96 | SR 96 | Ashland | Shelby |
| 149 Savannah-Vermilion Road | State Route 60 | SR 60 | Savannah | Vermilion |
| 150 Niles-Ashtabula Road | State Route 46 | SR 46 | Niles | Ashtabula |
| 151 Jefferson-Andover Road | State Route 84 | SR 307, Mells Road, Stanhope-Kelloggsville Road | Jefferson | West Andover |
| 151 Jefferson-Andover Road | State Route 85 | SR 85, US 6 | West Andover | Pennsylvania |
| 152 Jefferson-Geneva Road | State Route 84 | SR 307 | Jefferson | Geneva (south of) |
| 153 Painesville-Warren Road | State Route 86 | SR 86 | Painesville | Windsor |
| 153 Painesville-Warren Road | State Route 45 | SR 45 | Windsor | Warren |
| 154 Windsor-Geneva Road | State Route 45 | SR 534 | Windsor | Geneva |
| 155 Logan-Athens Road | State Route 21 | US 33 | Logan | Athens |
| 156 Athens-Hockingport Road | State Route 144 | SR 144, US 50 | Athens | Hockingport |
| 157 Athens-Marietta Road | State Route 26 | SR 550 | Athens | Marietta |
| 158 New Lexington-Athens Road | State Route 30 | SR 13 | New Lexington | Chauncey |
| 159 Athens-Pomeroy Road | State Route 21 | US 33 | Athens | Pomeroy |
| 160 Athens-McArthur Road | State Route 26 | US 50 | Athens | McArthur |
| 161 Pomeroy-Marietta Road | State Route 7 | SR 7 | Pomeroy | Little Hocking |
| 162 McConnelsville-Athens Road | State Route 77 | SR 377 | McConnelsville | Sharpsburg |
| 163 Middleport-McArthur Road | State Route 143 | SR 143 | Pomeroy | West of Albany |
| 164 Sidney-Wapakoneta Road | State Route 6 | US 25 (former) | Sidney | Wapakoneta |
| 165 Wapakoneta-St. Marys Road | State Route 32 | US 33 | Wapakoneta | St. Marys |
| 166 Kenton-Wapakoneta Road | State Route 67 | SR 67 | Wapakoneta | Kenton |
| 167 St. Marys-Celina Road | State Route 32 | SR 29, SR 703 | St. Marys | Celina |
| 168 Bellefontaine-Wapakoneta Road | State Route 32 | US 33, SR 366 | North of Huntsville | Wapakoneta |
| 169 Sidney-St. Marys Road | State Route 54 | SR 29 | Sidney | St. Marys |
| 170 Piqua-St. Marys Road | State Route 66 | SR 66 | Piqua | St. Marys |
| 171 Fort Recovery-Minster Road | State Route 119 | SR 119 | Indiana | Minster |
| 172 Minster-Sidney Road | State Route 119 | SR 119 | Minster | Northwest of Sidney |
| 173 St. Marys-Fort Wayne Road | State Route 54 | US 33 | St. Marys | Indiana |
| 174 Celina-Kossuth Road | State Route 197 | SR 197 | Celina | Kossuth |
| 175 Georgetown-Wilmington Road | State Route 53 | US 68 | Georgetown | Wilmington |
| 176 Georgetown-Ripley Road | State Route 221 | US 68 | Georgetown | Ripley |
| 177 Ripley-Hillsboro Road | State Route 38 | US 62 | Ripley | Hillsboro |
| 178 Georgetown-Higginsport Road | State Route 53 | SR 221 | Georgetown | Higginsport |
| 179 Hamilton-Middletown Road | State Route 6 | SR 4, SR 73 | Hamilton | Franklin |
| 180 Hamilton-Eaton Road | State Route 9 | US 127 | Hamilton | Eaton |
| 181 Hamilton-Richmond Road | State Route 224 | SR 177 | Hamilton | Indiana |
| 182 Oxford-Millville Road | State Route 126 | US 27 | Indiana | McGonigle |
| 182 Oxford-Millville Road | State Route 223 | US 27 | McGonigle | Northeast of Ross |
| 183 Old Oxford Road | State Route 126 | SR 130 | Hamilton | McGonigle |
| 184 Eaton-Middletown Road | State Route 122 | SR 122 | Eaton | Middletown |
| 185 Hamilton-Lebanon Road | State Route 125 | SR 63 | Hamilton (east of) | Lebanon |
| 186 Middletown-Germantown Road | State Route 52 | SR 4 | Middletown | Germantown |
| 187 Springfield-Urbana Road | State Route 53 | US 68 | Springfield | Urbana |
| 188 Urbana-West Jefferson Road | State Route 29 | SR 29 | Urbana | West Jefferson |
| 189 Urbana-Bellefontaine Road | State Route 53 | US 68 | Urbana | Bellefontaine |
| 190 Piqua-Urbana Road | State Route 29 | US 36 | Piqua | Urbana |
| 191 Urbana-Marysville Road | State Route 55 | US 36 | Urbana | Marysville |
| 192 Urbana-Sidney Road | State Route 54 | SR 29 | Urbana | Sidney |
| 193 Troy-Urbana Northern Road | State Route 202 | Troy Urbana Road | Troy | Urbana |
| 194 Urbana-London Road | State Route 56 | SR 56 | Urbana (east of) | London |
| 195 Springfield-Xenia Road | State Route 53 | US 68 | Springfield | Xenia |
| 196 Springfield-Troy Road | State Route 70 | SR 41 | Springfield | Troy |
| 197 Springfield-Washington Court House Road | State Route 70 | SR 41 | Springfield | Washington Court House |
| 198 Milton-Carlisle Road | State Route 71 | SR 571 | West Milton | Donnelsville |
| 199 Bucyrus-Tiffin Road | State Route 62 | SR 19 | Bucyrus | Broken Sword |
| 199 Bucyrus-Tiffin Road | State Route 100 | SR 100 | Broken Sword | Tiffin |
| 200 Bucyrus-Upper Sandusky Road | State Route 5 | US 30 | Bucyrus | Upper Sandusky |
| 201 Galion-Bucyrus Road | State Route 62 | SR 19 | Galion | Bucyrus |
| 202 Mansfield-Galion Road | State Route 10 | SR 309 | Mansfield | Galion |
| 203 Bucyrus-Crestline Road | State Route 5 | US 30 | Bucyrus | Crestline |
| 204 Shelby-Galion Road | State Route 61 | SR 61 | Shelby | Galion |
| 205 Plymouth-Bucyrus Road | State Route 98 | SR 98 | Plymouth | Bucyrus |
| 206 Galion-Mount Gilead Road | State Route 61 | SR 61 | Galion | Mount Gilead |
| 207 Crestline-Ontario Road | State Route 181 | SR 181 | Crestline | Ontario (west of) |
| 208 Greenville-Covington Road | State Route 29 | US 36 | Greenville | Covington |
| 209 Greenville-Milton Road | State Route 71 | SR 571 | Greenville | West Milton |
| 210 Eaton-Greenville Road | State Route 9 | US 127 | Eaton | Greenville |
| 211 Celina-Greenville Road | State Route 9 | US 127 | Celina | Greenville |
| 212 Greenville-Union City Road | State Route 29 | SR 571 | Greenville | Union City |
| 213 Greenville-Fort Recovery Road | State Route 51 | SR 49 | Greenville | Fort Recovery |
| 214 Greenville-Versailles Road | State Route 121 | SR 121 | Greenville | Versailles |
| 215 Greenville-New Paris Road | State Route 121 | SR 121 | Greenville | Indiana |
| 216 Piqua-Versailles Road | State Route 120 | SR 185 | Piqua | Versailles |
| 217 Sidney-Versailles Road | State Route 68 | SR 47 | Sidney | Versailles |
| 218 Versailles-Brock Road | State Route 120 | SR 185 | Versailles | Brock |
| 219 Findlay-Tiffin Road | State Route 106 | US 224 | Findlay | Tiffin |
| 220 Findlay-Bowling Green Road | State Route 6 | SR 25 | Findlay | Bowling Green |
| 221 Findlay-Kenton Road | State Route 21 | US 68 | Findlay | Kenton |
| 222 Findlay-Upper Sandusky Road | State Route 22 | SR 199, SR 568 | Findlay | Upper Sandusky |
| 223 Ottawa-Findlay Road | State Route 22 | SR 15 | Ottawa | Findlay |
| 224 Baltimore-Fostoria Road | State Route 17 | SR 18 | Hoytville | Fostoria |
| 225 Deshler-Findlay Road | State Route 17 | SR 18 | Deshler (west of) | Hoytville |
| 225 Deshler-Findlay Road | State Route 186 | SR 186, SR 235 | Hoytville | Findlay (west of) |
| 226 Bellefontaine-Kenton Road | State Route 53 | US 68 | Bellefontaine | Kenton |
| 227 Kenton-Forest Road | State Route 53 | SR 53 | Kenton | Forest |
| 228 Marysville-Kenton Road | State Route 21 | SR 31 | Marysville | Kenton |
| 229 Kenton-Upper Sandusky Road | State Route 67 | SR 67 | Kenton | Upper Sandusky |
| 230 Roundhead-Ada Road | State Route 69 | SR 235 | Roundhead | Ada |
| 231 Ada-Forest Road | State Route 69 | SR 81 | Ada | Forest |
| 232 Reservoir Road | State Route 69 | SR 235 | Roundhead | Lakeview |
| 233 Forest-Upper Sandusky Road | State Route 53 | SR 53 | Forest | Upper Sandusky |
| 234 Sidney-Bellefontaine Road | State Route 68 | SR 47 | Sidney | Bellefontaine |
| 235 Marysville-Bellefontaine Road | State Route 32 | US 33 | Marysville | Bellefontaine |
| 236 Bellefontaine-Richwood Road | State Route 68 | SR 47 | Bellefontaine | East of Richwood |
| 237 Piqua-Sidney Road | State Route 6 | US 25 (former) | Piqua | Sidney |
| 238 Delaware-Marysville Road | State Route 55 | US 36 | Delaware | Marysville |
| 239 Marysville-London Road | State Route 38 | SR 38 | Marysville | London |
| 240 Richwood-Delaware Road | State Route 47 | SR 37 | South of Richwood | Delaware |
| 241 Delaware-London Road | State Route 160 | US 42 | Delaware | London |
| 242 Plain City-Dublin Road | State Route 161 | SR 161 | Plain City | Dublin (west of) |
| 243 London-Circleville Road | State Route 56 | SR 56 | London | Circleville |
| 244 Washington-London Road | State Route 38 | SR 38 | Bloomingburg (south of) | Bloomingburg |
| 244 Washington-London Road | State Route 38 | SR 38 | Bloomingburg | London |
| 245 Piqua-Troy Road | State Route 6 | US 25 (former) | Piqua | Troy |
| 246 Piqua-Covington Road | State Route 29 | US 36 | Piqua | Covington |
| 247 Covington-Troy Road | State Route 70 | SR 41 | Covington | Troy |
| 248 Wilmington-Xenia Road | State Route 53 | US 68 | Wilmington | Xenia |
| 249 Eaton-Richmond Road | State Route 11 | US 35 | Eaton | Indiana |
| 250 Franklin-Lebanon Road | State Route 123 | SR 123 | Franklin | Lebanon |
| 251 Franklin-Wilmington Road | State Route 73 | SR 73 | Franklin | Wilmington |
| 252 Lebanon-Morrow Road | State Route 123 | SR 123 | Lebanon | Morrow |
| 253 Roachester-Blanchester Road | State Route 123 | SR 123 | Roachester | Blanchester |
| 254 Wilmington-Hillsboro Road | State Route 73 | SR 73 | Wilmington | Hillsboro |
| 255 Batavia-Owensville Road | State Route 132 | SR 132 | Batavia | Owensville |
| 256 Batavia-New Richmond Road | State Route 132 | SR 132 | Batavia | New Richmond |
| 257 Bethel-Chilo Road | State Route 133 | SR 133, SR 222 | Bethel | Chilo |
| 258 Hillsboro-Chillicothe Road | State Route 26 | US 50 | Hillsboro | Chillicothe |
| 259 Hillsboro-Washington Road | State Route 38 | US 62 | Hillsboro | Washington Court House |
| 260 Hillsboro-Greenfield Road | State Route 138 | SR 138 | Hillsboro | Greenfield |
| 261 Hillsboro-Piketon Road | State Route 24 | SR 124 | Hillsboro | Piketon |
| 262 Celina-Van Wert Road | State Route 9 | US 127 | Celina | Van Wert |
| 263 Fort Recovery-Willshire Road | State Route 51 | SR 49 | Fort Recovery | Willshire |
| 264 Celina-Wabash Road | State Route 32 | SR 29 | Celina | Indiana |
| 265 Van Wert-Rockford Road | State Route 118 | SR 118 | Van Wert | Rockford |
| 266 Upper Sandusky-Tiffin Road | State Route 53 | SR 53 | Upper Sandusky | Tiffin |
| 267 Upper Sandusky-Bellevue Road | State Route 67 | SR 67, SR 18, SR 113 | Upper Sandusky | Northeast of Bellevue |
| 268 Fostoria-Carey Road | State Route 63 | US 23 | Fostoria | Carey |
| 269 Fremont-Tiffin Road | State Route 53 | SR 53 | Fremont | Tiffin |
| 270 Tiffin-Fostoria Road | State Route 17 | SR 18 | Tiffin | Fostoria |
| 271 Tiffin-Bellevue Road | State Route 101 | SR 101 | Tiffin | South of Clyde |
| 271 Tiffin-Bellevue Road | State Route 229 | SR 113 (former) | South of Clyde | Bellevue |
| 272 Tiffin-New Haven Road | State Route 17 | US 224 | Tiffin | Chicago Junction |
| 273 Perrysburg-Fostoria Road | State Route 63 | SR 199 | Perrysburg | Fostoria |
| 274 Fremont-Bellevue Road | State Route 2 | US 20 | Fremont | Bellevue |
| 275 Fremont-Perrysburg Road | State Route 2 | US 20 | Fremont | Southeast of Woodville |
| 275 Fremont-Perrysburg Road | State Route 102 | US 20 | Southeast of Woodville | Perrysburg |
| 276 Sandusky-Clyde Road | State Route 101 | SR 101 | Sandusky | Clyde (south of) |
| 277 Fremont-Port Clinton Road | State Route 53 | SR 53 | Fremont | Port Clinton |
| 278 Fremont-Bowling Green Road | State Route 34 | US 6 | Fremont | Bowling Green |
| 279 Bowling Green-Port Clinton Road | State Route 105 | SR 105 | Bowling Green | Oak Harbor |
| 279 Bowling Green-Port Clinton Road | State Route 163 | SR 163 | Oak Harbor | Port Clinton |
| 280 Fremont-Oak Harbor Road | State Route 62 | SR 19 | Fremont | Oak Harbor |
| 281 Fremont-Castalia Road | State Route 34 | SR 412 | Fremont | Castalia |
| 282 Bowling Green-Perrysburg Road | State Route 6 | SR 25 | Bowling Green | Perrysburg |
| 283 Bowling Green-Waterville Road | State Route 64 | SR 64 | Bowling Green | Waterville |
| 284 Grand Rapids-Bowling Green Road | State Route 184 | SR 110 (former) | Grand Rapids | Bowling Green (north of) |
| 285 Ottawa-Grand Rapids Road | State Route 65 | SR 65 | Ottawa | McClure |
| 285 Ottawa-Grand Rapids Road | State Route 185 | SR 65 | McClure | North of McClure |
| 285 Ottawa-Grand Rapids Road | State Route 110 | SR 110 | North of McClure | Grand Rapids |
| 285 Ottawa-Grand Rapids Road | State Route 184 | SR 295 | Grand Rapids | Grand Rapids (north of) |
| 286 Bowling Green-Napoleon Road | State Route 34 | US 6 | Bowling Green | Napoleon |
| 287 Mansfield-Norwalk Road | State Route 30 | SR 13 | Mansfield | Fitchville |
| 288 Milan-Elyria Road | State Route 61 | SR 113 | Milan | Berlinville |
| 288 Milan-Elyria Road | State Route 59 | SR 113 | Berlinville | Elyria |
| 289 Bellevue-Norwalk Road | State Route 2 | US 20 | Bellevue | Norwalk |
| 290 Oberlin-Norwalk Road | State Route 2 | US 20, SR 511 | Oberlin | Norwalk |
| 291 Medina-Norwalk Road | State Route 18 | SR 18 | Medina | Norwalk |
| 292 Plymouth-Norwalk Road | State Route 61 | SR 61 | Plymouth | Norwalk |
| 293 New London-Fitchville Road | State Route 162 | SR 162 | New London | Fitchville |
| 294 Sandusky-Norwalk Road | State Route 30 | US 250 | Sandusky | Norwalk |
| 295 Barnesville-Bellaire Road | State Route 147 | SR 147 | Barnesville | Bellaire |
| 296 Wauseon-Napoleon Road | State Route 33 | SR 108 | Wauseon | Napoleon |
| 297 Bryan-Wauseon Road | State Route 2 | SR 2 | Bryan | Wauseon |
| 298 Wauseon-Morenci Road | State Route 33 | SR 108 | Wauseon | Michigan |
| 299 Liberty-Adrian Road | State Route 65 | SR 109 | McClure (west of) | Michigan |
| 300 Swanton-Metamora Road | State Route 64 | SR 64 | Swanton | Michigan |
| 301 Archbold-Fayette Road | State Route 66 | SR 66, US 127 | Archbold | Michigan |
| 302 Archbold-Defiance Road | State Route 66 | SR 66 | Archbold | Defiance |
| 303 West Unity-Montpelier Road | State Route 107 | SR 107, US 20A | Burlington | Montpelier (west of) |
| 304 Bryan-Fort Wayne Road | State Route 108 | SR 2 | Bryan | Hicksville |
| 304 Bryan-Fort Wayne Road | State Route 17 | SR 2 | Hicksville | Indiana |
| 305 Bryan-Defiance Road | State Route 9 | SR 15 | Bryan | Ney |
| 305 Bryan-Defiance Road | State Route 22 | SR 15 | Ney | Defiance |
| 306 Bryan-Pioneer Road | State Route 9 | SR 15 | Bryan | Michigan |
| 307 Bryan-West Unity Road | State Route 108 | US 127 | Bryan | Alvordton (east of) |
| 308 Bryan-Edon Road | State Route 34 | SR 34 | Bryan | Indiana |
| 309 Bryan-Edgerton Road | State Route 2 | US 6 | Bryan | Indiana |
| 310 Bryan-Napoleon Road | State Route 34 | SR 34, US 6 | Bryan | Napoleon |
| 311 Edon-Cooney Road | State Route 107 | SR 49 | Edon | Michigan |
| 312 Stryker-Evansport Road | State Route 191 | SR 191 | Stryker | Evansport (east of) |
| 313 Oberlin-Elyria Road | State Route 2 | US 20, SR 511 | Oberlin | Elyria |
| 314 Medina-Elyria Road | State Route 57 | SR 57 | Medina | Elyria |
| 315 Elyria-Lorain Road | State Route 57 | SR 57 | Elyria | Lorain |
| 316 Napoleon-Defiance Road | State Route 31 | US 24 | Napoleon | Defiance |
| 317 Ottawa-Napoleon Road | State Route 33 | SR 109, SR 108, CR 10A | Ottawa | Napoleon |
| 318 Defiance-Holgate Road | State Route 17 | SR 18 | Defiance | East of Holgate |
| 319 Napoleon-Deshler Road | State Route 17 | SR 18 | East of Holgate | Deshler (west of) |
| 320 Holgate-Kieferville Road | State Route 115 | SR 115 (former), SR 108 | North of Holgate | Kieferville |
| 321 Medina-Wadsworth Road | State Route 57 | SR 57 | Medina | Wadsworth |
| 322 Ravenna-Warren Road | State Route 36 | SR 5 | Ravenna | Warren |
| 323 Kent-Ravenna Road | State Route 36 | SR 59 | Kent | Ravenna |
| 324 Painesville-Ravenna Road | State Route 44 | SR 44 | Painesville | Ravenna |
| 325 Warren-Burton Road | State Route 16 | US 422 | Warren | Parkman |
| 325 Warren-Burton Road | State Route 87 | SR 168 | Parkman | Burton |
| 326 Ravenna-Parkman Road | State Route 88 | SR 88 | Ravenna | Parkman |
| 327 Chardon-Madison Road | State Route 85 | US 6 | Chardon | Hambden |
| 327 Chardon-Madison Road | State Route 166 | SR 166, SR 528 | Hambden | Madison |
| 328 Canfield-Niles Road | State Route 46 | SR 46 | Canfield | Niles |
| 329 Warren-Sharon Road | State Route 82 | SR 82 | Warren | Sharon, PA |
| 330 Warren-Meadville Road | State Route 36 | SR 5 | Warren | Pennsylvania |
| 331 Youngstown-Sharon Road | State Route 19 | US 62 | Youngstown | Sharon, PA |
| 332 Delaware-Mount Gilead Road | State Route 55 | US 42 | Delaware | Mount Gilead |
| 333 Mount Gilead-Mount Vernon Road | State Route 42 | SR 95, SR 13 | Mount Gilead | Mount Vernon |
| 334 Mount Gilead-Mansfield Road | State Route 55 | US 42 | Mount Gilead | Mansfield |
| 335 Mount Gilead-Sunbury Road | State Route 61 | SR 61 | Mount Gilead | Sunbury |
| 336 Delaware-Newark Road | State Route 47 | SR 37 | Delaware | Newark (west of) |
| 337 Newark-Mount Vernon Road | State Route 30 | SR 13 | Newark | Mount Vernon |
| 338 Mount Vernon-Mansfield Road | State Route 30 | SR 13 | Mount Vernon (north of) | Mansfield |
| 339 Mount Vernon-Coshocton Road | State Route 42 | US 36, SR 715 | Mount Vernon | Coshocton |
| 340 Danville-Jelloway Road | State Route 205 | SR 205 | Danville | Jelloway |
| 341 Millersburg-Canal Dover Road | State Route 39 | SR 39 | Millersburg | Canal Dover |
| 342 Millersburg-Wooster Road | State Route 76 | SR 83 | Millersburg | Wooster |
| 343 Killbuck Road | State Route 76 | SR 60 | Coshocton (west of) | Killbuck |
| 344 Zanesville-Dresden Road | State Route 77 | SR 60 | Zanesville | Trinway |
| 345 Zanesville-McConnelsville Road | State Route 77 | SR 60, SR 376 | Zanesville | McConnelsville |
| 346 Newark-Zanesville Road | State Route 156 | SR 146 | Newark (east of) | Zanesville (north of) |
| 347 Newark-Coshocton Road | State Route 20 | SR 16 | Newark | Coshocton |
| 348 Zanesville-Caldwell Road | State Route 146 | SR 146, SR 215 (former) | Zanesville | Caldwell (north of) |
| 349 Cambridge-Coshocton Road | State Route 209 | SR 209 | Cambridge | Bloomfield |
| 349 Cambridge-Coshocton Road | State Route 76 | SR 83 | Bloomfield | Coshocton |
| 350 Zanesville-New Lexington Road | State Route 75 | SR 93 | Zanesville (south of) | New Lexington (east of) |
| 351 Zanesville-Otsego Road | State Route 75 | SR 93 | Zanesville | Otsego |
| 352 Cambridge-Newcomerstown Road | State Route 8 | US 21 (former) | Cambridge | Newcomerstown |
| 353 Cambridge-Caldwell Road | State Route 8 | SR 821 | Cambridge | Caldwell |
| 354 McConnelsville-New Lexington Road | State Route 37 | SR 37 | McConnelsville | New Lexington |
| 355 Logan-New Lexington Road | State Route 75 | SR 93 | Logan | New Lexington |
| 356 Newark-New Lexington Road | State Route 30 | SR 13 | Newark | New Lexington |
| 357 Lancaster-New Lexington Road | State Route 37 | SR 37 | Lancaster | New Lexington |
| 358 Shawnee-Corning Road | State Route 216 | SR 155 | Shawnee | Corning |
| 359 Lancaster-Newark Road | State Route 79 | SR 79, SR 37 | Lancaster | Newark |
| 360 Logan-Lancaster Road | State Route 21 | US 33 | Logan | Lancaster |
| 361 Chillicothe-Lancaster Road | State Route 159 | SR 159 | Chillicothe (north of) | Lancaster (south of) |
| 362 Circleville-Adelphi Road | State Route 56 | SR 56 | Circleville | Adelphi |
| 363 Chillicothe-Logan Road | State Route 27 | SR 180 | Chillicothe (north of) | Logan (west of) |
| 364 Chillicothe-Jackson Road | State Route 11 | US 35 | Chillicothe | Jackson |
| 365 Chillicothe-McArthur Road | State Route 26 | US 50 | Chillicothe | McArthur |
| 366 Jackson-Piketon Road | State Route 24 | SR 124 | Jackson | Piketon |
| 367 Waverly-Zahn's Corner Road | State Route 220 | SR 220 | Waverly | Zahn's Corner |
| 368 Lisbon-Canton Southern Road | State Route 5 | US 30 | Lisbon | Minerva (east of) |
| 368 Lisbon-Canton Southern Road | State Route 226 | unbuilt | Minerva (east of) | Minerva (north of) |
| 369 Minerva-Sandyville Road | State Route 5 | US 30 | Minerva (east of) | Minerva |
| 369 Minerva-Sandyville Road | State Route 155 | SR 183 | Minerva | Sandyville |
| 370 Dennison-Cadiz Road | State Route 13 | US 250 | Dennison | Cadiz |
| 371 Cadiz-Carrollton Road | State Route 35 | SR 9 | Cadiz | Carrollton |
| 372 Dennison-Scio Road | State Route 212 | SR 151 | Dennison (east of) | Bowerston |
| 372 Dennison-Scio Road | State Route 151 | SR 151 | Bowerston | Jewett (west of) |
| 372 Dennison-Scio Road | State Route 227 | New Rumley Road | Jewett (west of) | Jewett (southwest of) |
| 373 Jewett-Hopedale Road | State Route 151 | Old Jewett Road | Jewett (west of) | Jewett |
| 373 Jewett-Hopedale Road | State Route 151 | SR 151 | Jewett | Hopedale |
| 374 Dell Roy-Bowerston Road | State Route 151 | SR 212 | Dellroy | Bowerston |
| 375 Carrollton-Kensington Road | State Route 35 | SR 9 | Carrollton | Kensington |
| 376 Carrollton-Canal Dover Road | State Route 20 | SR 39 | Carrollton | Canal Dover |
| 377 Carrollton-Salineville Road | State Route 20 | SR 39 | Carrollton | Salineville |
| 378 Skelley-Empire Road | State Route 152 | SR 152 | Skelley | Empire |
| 379 Mingo-Smithfield Road | State Route 151 | SR 151 | Mingo Junction | Hopedale |
| 380 Mount Pleasant-Rayland Road | State Route 150 | SR 150 | Mount Pleasant (west of) | Rayland |
| 381 Salineville-Yellow Creek Road | State Route 20 | SR 39 | Salineville | Wellsville |
| 382 Lisbon-Salineville Road | State Route 164 | SR 164 | Lisbon | Salineville |
| 383 Lisbon-East Palestine Road | State Route 154 | SR 517, SR 558 | Lisbon | East Palestine |
| 383 Lisbon-East Palestine Road | State Route 14 | SR 165 | East Palestine | Pennsylvania |
| 384 Salem-Hanoverton Road | State Route 35 | SR 9 | Salem | Hanoverton |
| 385 Woodsfield-Clarington Road | State Route 78 | SR 78 | Woodsfield | Clarington |
| 386 Caldwell-Woodsfield Road | State Route 78 | SR 78, SR 145, SR 724 | Caldwell | Woodsfield |
| 387 Woodsfield-Sistersville Road | State Route 48 | SR 800 | Woodsfield | Fly |
| 388 Lower Salem-Jerles Road | State Route 145 | SR 145 | Lower Salem | Jerles |
| 389 Woodsfield-Marietta Road | State Route 26 | SR 26 | Woodsfield | Marietta |
| 390 Caldwell-McConnelsville Road | State Route 78 | SR 78 | Caldwell | McConnelsville |
| 391 Caldwell-Marietta Road | State Route 8 | SR 821 | Caldwell | Marietta |
| 392 Caldwell-Barnesville Road | State Route 147 | SR 147 | Caldwell (east of) | Barnesville (west of) |
| 393 Marietta-McConnelsville Road | State Route 37 | SR 60 | Marietta | McConnelsville |
| 394 Pomeroy-Portland Road | State Route 24 | SR 124, US 33 | Pomeroy | West Virginia |
| 395 Pomeroy-Jackson Road | State Route 24 | SR 124 | Pomeroy | Jackson |
| 396 McArthur-Jackson Road | State Route 75 | SR 93 | McArthur | Jackson |
| 397 McArthur-Logan Road | State Route 75 | SR 93 | McArthur | Logan |
| 398 Gallipolis-McArthur Road | State Route 142 | SR 160 | Gallipolis | McArthur (south of) |
| 399 Jackson-Gallipolis Road | State Route 11 | US 35 | Jackson | Gallipolis |
| 400 Jackson-Ironton Road | State Route 75 | SR 93 | Jackson | Ironton |
| 401 Oak Hill-Cadmus Road | State Route 141 | SR 233 | Oak Hill | Cadmus |
| 402 Oak Hill-Portsmouth Road | State Route 140 | SR 140 | Oak Hill | Portsmouth (east of) |
| 403 Jackson-Portsmouth Road | State Route 139 | SR 139 | Jackson | Portsmouth |
| 404 Ironton-Miller Road | State Route 141 | SR 141 | Ironton | Ironton (east of) |
| 404 Ironton-Miller Road | State Route 217 | SR 217 | Ironton (east of) | Miller |
| 405 Gallipolis-Ironton Road | State Route 141 | SR 141 | Gallipolis | Ironton (east of) |
| 406 Portsmouth-Lucasville Western Road | State Route 73 | SR 73 | Portsmouth | Portsmouth (north of) |
| 406 Portsmouth-Lucasville Western Road | State Route 104 | SR 104 | Portsmouth (north of) | Lucasville (west of) |
| 406 Portsmouth-Lucasville Western Road | State Route 104 | SR 348 | Lucasville (west of) | Lucasville |
| 407 Newcomerstown-Coshocton Road | State Route 20 | US 36 | Newcomerstown | Coshocton |
| 408 West Lafayette-New Philadelphia Road | State Route 75 | SR 751 | West Lafayette | Stone Creek |
| 408 West Lafayette-New Philadelphia Road | State Route 20 | US 21 (former) | Stone Creek | New Philadelphia (west of) |
| 409 Canal Dover-New Philadelphia Western Road | State Route 211 | SR 211 (former) | Canal Dover | New Philadelphia (west of) |
| 409 Canal Dover-New Philadelphia Western Road | State Route 20 | US 21 (former) | New Philadelphia (west of) | New Philadelphia |
| 410 Marquand Mills-Newcomerstown Road | State Route 75 | SR 93, CR 106 | Marquand Mills | Newcomerstown (west of) |
| 411 Walhonding-Newark Road | State Route 79 | SR 79 | Walhonding | Fallsburg (east of) |
| 411 Walhonding-Newark Road | State Route 207 | SR 668 (former) | Fallsburg (east of) | Newark (east of) |
| 412 New Philadelphia-Uhrichsville Road | State Route 8 | US 250 | New Philadelphia | Uhrichsville |
| 413 Newcomerstown-Uhrichsville Road | State Route 8 | US 36 | Newcomerstown | Uhrichsville |
| 414 Wooster-Canal Dover Road | State Route 95 | US 250 | Wooster | Strasburg (north of) |
| 414 Wooster-Canal Dover Road | State Route 13 | SR 21 | Strasburg (north of) | Canal Dover |
| 415 Newcomerstown-Stone Creek Road | State Route 20 | US 21 (former) | Newcomerstown | Stone Creek |
| 416 Orrville-Wooster Road | State Route 177 | McQuaid Road | Orrville | Wooster (east of) |
| 417 Orrville Northern Road | State Route 94 | SR 57 | Orrville | Easton |
| 418 Van Wert-Delphos Road | State Route 5 | US 30 | Van Wert | Delphos |
| 419 Van Wert-Fort Wayne Road | State Route 5 | US 30 | Van Wert | Indiana |
| 420 Hicksville-Defiance Road | State Route 17 | SR 18 | Hicksville | Defiance |
| 421 Ottawa-Defiance Road | State Route 22 | SR 15 | Ottawa | Defiance |
| 422 Defiance-Fort Wayne Road | State Route 31 | US 24 | Defiance | Indiana |
| 423 Defiance-Paulding Road | State Route 111 | SR 111 | Defiance | Paulding |
| 424 Paulding-Bryan Road | State Route 9 | US 127 | Paulding | Ney |
| 425 Defiance-Delphos Road | State Route 66 | SR 66 | Defiance | Delphos |
| 426 Defiance-Auburn Road | State Route 22 | SR 249 | Ney | Indiana |
| 427 Payne-Hicksville Road | State Route 108 | SR 49 | Convoy (north of) | Hicksville |
| 428 Hicksville-Auburn Road | State Route 193 | SR 18 | Hicksville | Indiana |
| 429 Paulding-Payne Road | State Route 194 | SR 500 | Paulding | Payne |
| 430 Van Wert-Paulding Road | State Route 9 | US 127 | Van Wert | Paulding |
| 431 Continental-Paulding Road | State Route 113 | SR 613 | Continental (east of) | Paulding (south of) |
| 432 Paulding-Fort Wayne Road | State Route 111 | SR 613 | Payne | Indiana |
| 433 Paulding-Woodburn Road | State Route 111 | SR 111 | Paulding | Payne (north of) |
| 434 Van Wert-Decatur Road | State Route 109 | US 224 | Van Wert | Indiana |
| 435 Van Wert-Ottawa Road | State Route 109 | US 224 | Van Wert | Ottawa |
| 436 Shelby-Mansfield Road | State Route 39 | SR 39 | Shelby | Mansfield |
| 437 Shelby-Plymouth Road | State Route 61 | SR 61 | Shelby | Plymouth |
| 438 Bono-Port Clinton Road | State Route 23 | SR 2 | Bono | Port Clinton |
| 439 Oak Harbor-Genoa Road | State Route 163 | SR 163 | Oak Harbor | Genoa |
| 440 Port Clinton-Marblehead Road | State Route 163 | SR 163 | Port Clinton | Marblehead |
| 441 West Union-Hillsboro Road | State Route 136 | SR 136 | West Union (west of) | Hillsboro (south of) |
| 442 Steubenville-Hammondsville Road | State Route 213 | SR 213 | Steubenville | Knoxville |
| 442 Steubenville-Hammondsville Road | State Route 152 | SR 213 | Knoxville | Yellow Creek |
| 443 Gambier-New Castle Road | State Route 206 | SR 229 | Mount Vernon | Newcastle |
| 444 Dorset-Richmond Center Road | State Route 167 | SR 167 (former) | Dorset | Pennsylvania |
| 445 Dayton-Valley Road | State Route 69 | SR 235 | Dayton | East of Brandt |
| 446 Richmond Road | State Route 175 | SR 175 | Bedford | Euclid (east of) |
| 447 Burton-Bloomfield Road | State Route 168 | SR 87 | Burton | North Bloomfield |
| 448 Roundhead-McGuffey Road | State Route 195 | SR 195 | Roundhead (north of) | McGuffey (north of) |
| 449 Tiffin-Republic Road | State Route 106 | SR 18 | Tiffin | Republic |
| 450 Roscoe Southern Road | State Route 210 | SR 16 | Roscoe | Coshocton (south of) |
| 451 Wilmington-Sardinia Road | State Route 134 | SR 134 | Wilmington | Sardinia |
| 452 Nicholsville-Felicity Road | State Route 222 | SR 222 | Nicholsville (north of) | Felicity |
| 453 Columbus-Chillicothe Western Road | State Route 104 | SR 104 | Columbus | Chillicothe |
| 454 Jeromeville-Sullivan Road | State Route 58 | SR 89 | Mohicanville | South of Sullivan |
| 455 Monroeville-Chicago Junction Road | State Route 99 | SR 99 | Monroeville | Chicago Junction |
| 456 Bryan-Evansport Road | State Route 192 | SR 192 (former) | Bryan | Evansport (north of) |
| 457 Toledo-Napoleon Road | State Route 110 | SR 110 | Napoleon | North of McClure |
| 458 Felicity Southern Road | State Route 222 | SR 133 | Felicity | Utopia (west of) |
| 459 Allensburg-Lynchburg Road | State Route 135 | SR 135 | Allensburg | Lynchburg |
| 460 Cleveland-Kent Road | State Route 82 | SR 43 | Cleveland | Aurora |
| 460 Cleveland-Kent Road | State Route 89 | SR 43 | Aurora | Suffield |
| 461 Baltimore-Reynoldsburg Road | State Route 204 | SR 256 | Baltimore | Reynoldsburg |
| 462 Lancaster-Kirkersville Road | State Route 158 | SR 158 | Lancaster | Kirkersville |
| 463 Lancaster-Circleville Northern Road | State Route 158 | SR 188 | Lancaster | Circleville |
| 464 Beamsville-Versailles Road | State Route 199 | SR 242 (former) | Beamsville | Versailles |
| 465 Orrville Southern Road | State Route 94 | SR 57 | Orrville | Dalton (west of) |
| 466 Solon-Willoughby Road | State Route 91 | SR 91 | Solon | Willoughby |
| 467 Hamilton-Scipio Road | State Route 127 | SR 129 | Hamilton | Scipio |
| 468 Versailles Western Road | State Route 68 | SR 47 | Versailles | Dawn |
| 469 Harrisburg-Westville Road | State Route 173 | US 62 | Harrisburg | Beloit (south of) |
| 470 Millersport-Mount Perry Road | State Route 204 | SR 204 | Millersport (west of) | Mount Perry (south of) |
| 471 Troy-Urbana Southern Road | State Route 55 | SR 55 | Troy | Urbana |
| 472 Springfield-Jamestown Road | State Route 72 | SR 72 | Springfield | Jamestown |
| 473 Jamestown-Hillsboro Road | State Route 72 | SR 72 | Jamestown | Hillsboro (north of) |
| 474 Aurora-Warren Road | State Route 82 | SR 82 | Aurora | Warren (west of) |
| 475 Hambden-Andover Road | State Route 85 | US 6 | Hambden | Andover |
| 476 Ashtabula-Sheffield Road | State Route 83 | SR 84 | Ashtabula | Pennsylvania |
| 477 Coshocton-Plainfield-Cambridge Road | State Route 42 | SR 541 | Coshocton | Kimbolton |
| 478 Ganges-Plymouth Road | State Route 178 | SR 603, Ganges 5 Points Road | Ganges (south of) | Plymouth |
| 479 Newark-Fallsburg Road | State Route 79 | SR 79 | Newark | Fallsburg (east of) |
| 480 Williamsburg-Owensville Road | State Route 132 | SR 276 | Williamsburg | Owensville |
| 481 Washington-Bloomingburg Road | State Route 38 | SR 38 (former) | Washington Court House | Bloomingburg |
| 482 St. Marys-Monticello Road | State Route 198 | SR 116 | St. Marys | Monticello (north of) |
| 483 Bellville-Lexington Road | State Route 97 | SR 97 | Bellville | Lexington |
| 484 McConnelsville-Cambridge Road | State Route 215 | SR 83, SR 146 | McConnelsville (east of) | Cambridge (south of) |
| 485 Bucyrus-Clyde Road | State Route 62 | SR 19 | Broken Sword | North of Republic |
| 485 Bucyrus-Clyde Road | State Route 228 | SR 228 | North of Republic | Southwest of Clyde |
| 486 Canfield-Poland Road | State Route 17 | US 224 | Canfield | Pennsylvania |
| 487 Dayton-Troy Eastern Road | State Route 202 | SR 202 | Dayton | Troy |
| 488 Lisbon-Wellsville Road | State Route 153 | SR 45 | Lisbon (south of) | Wellsville |
| 489 Carrollton-Malvern Road | State Route 43 | SR 43 | Carrollton (north of) | Malvern |
| 490 Bucyrus-Nevada-Upper Sandusky Road | State Route 182 | SR 182 (former) | Bucyrus | Upper Sandusky |
| 491 Holgate-Miller City Road | State Route 188 | SR 108 | Holgate | Miller City (south of) |
| 492 Middleport-Bradbury Road | State Route 143 | Bradbury Road | Middleport | East of Rutland |
| 493 Road | State Route 5 | US 30 | Osnaburg | Minerva |
| 494 Road | State Route 131 | SR 131 | Milford | Vera Cruz |
| 495 Road | State Route 230 | SR 230 (former) | Fremont (southwest of) | Fremont (west of) |
| 496 Road | State Route 196 | SR 196 | New Hampshire | Westminster |
| 497 Road | State Route 54 | SR 54 | South Charleston | Urbana |
| 498 Road | State Route 200 | US 36 | Greenville (south of) | Indiana |
| 499 Road | State Route 176 | SR 176 | Richfield | Cleveland |
| 500 Road | State Route 170 | SR 170 | Unity | Petersburg |
| 501 Mansfield-Crestline Road | State Route 5 | US 30 | Mansfield | Crestline |
| 502 Youngstown-East Liverpool Road | State Route 7 | SR 7, SR 164 | East Liverpool | Youngstown |
| 503 Road | State Route 187 | SR 613 | Leipsic | McComb |
| 504 Road | State Route 104 | SR 104 | Lucasville (west of) | Waverly |
| 505 Road | State Route 78 | SR 78 | Glouster | McConnelsville |
| 506 Road | State Route 48 | SR 800 | West of Hendrysburg | Dennison |
| 507 Road | State Route 157 | SR 79 | Lakeside | Hebron (east of) |
| 508 Road | State Route 218 | SR 218, SR 553 | Crown City | Gallipolis (south of) |
| 509 Road | State Route 219 | SR 243 (former) | Proctorville | Athalia (south of) |
| 510 Road | State Route 106 | SR 189 | Fort Jennings | Vaughnsville |
| 511 Canton-Navarre Road | State Route 19 | US 62 (former) | Canton | Navarre |
| 512 Road | State Route 5 | US 30 | Gomer | Upper Sandusky |
| 513 Road | State Route 76 | SR 83 | New Concord | Bloomfield |
| 514 Road | State Route 80 | SR 183, SR 700, Rock Spring Road | Atwater Center | Welshfield |
| 515 Road | State Route 62 | SR 19 | North of Republic | Fremont |
| 516 Salem-Warren Road | State Route 45 | SR 45 | Salem | Warren |
| 517 Road | State Route 114 | SR 114 | Indiana | Mandale |
| 518 Road | State Route 216 | SR 216, SR 78 | Nelsonville | New Straitsville |
| 519 Road | State Route 208 | SR 208 | Dresden | Adamsville |
| | State Route 59 | SR 61 | Norwalk | Berlinville |
| | State Route 61 | SR 61 | Berlinville | Ceylon |
| | State Route 84 | SR 307 | Madison (south of) | Geneva (south of) |
| | State Route 89 | SR 43 | Suffield | Canton |
| | State Route 166 | SR 528 | Madison | North Madison |
| | State Route 175 | SR 283 | Euclid | Painesville |
| | State Route 231 | SR 231 | Nevada | Nevada (north of) |
