List of state highways in South Dakota
# List of state highways in South Dakota

South Dakota's state highways were assigned in a numbering pattern that followed that of the U.S. Highways followed upon their inception. East–west highways carried even numbers and increased from North to South  – while north–south highways carried odd numbers and increased from east to west. This holds true only for two-digit highways. Three-digit highways follow the odd–even routing, but do not sequentially remain near a "parent" route as a spur or alternate route, instead being more independent of any parent two-digit route.

## State highways

| Number | Length (mi) | Length (km) | Southern or western terminus | Northern or eastern terminus | Formed | Removed | Notes |
| - | - | - | - | - | - | - | - |
| SD 8 | 180 | 290 | Montana state line | Mobridge | 01935-01-011935 | 01968-01-01c. 1968 | Absorbed by SD 20 when extended west across the Missouri River |
| SD 9 | — | — | North Dakota state line | Britton | 01935-01-011935 | 01950-01-011950 | Now an unnumbered county road |
| SD 10 | 175.945 | 283.156 | SD 1804 in Pollock | MN 28 at the Minnesota state line southeast of Sisseton | 01927-01-011927 | current | |
| SD 11 | 77.724 | 125.085 | South Franklin Street / East Rose Street in Elk Point | MN 269 at the Minnesota state line near Sherman | 01926-01-011926 | current | Segment between SD 50 and SD 48 is currently not a portion of the highway |
| SD 12 | 325 | 523 | Mound City | Minnesota state line southeast of Sisseton | 01926-01-011926 | 01927-01-011927 | Redesignated as SD 10 |
| SD 13 | 23.891 | 38.449 | SD 34 east of Egan | US 14 north of Elkton | 01926-01-011926 | current | |
| SD 15 | 67.562 | 108.730 | SD 28 west of Toronto | CR 17 / CR 34 north of Summit | 01926-01-011926 | current | |
| SD 15A | 10.486 | 16.876 | US 12 near Marvin | SD 15 at Wilmot | 01951-01-011951 | 01976-12-311976 | Originally part of the SD 15 mainline; redesignated as SD 123 |
| SD 15Y | 12.167 | 19.581 | US 12 in Big Stone City | SD 15 near Hartford Beach State Park | 01957-01-011957 | 01976-12-311976 | Redesignated as SD 109 |
| SD 16 | — | — | White Butte | Big Stone City | 01926-01-011926 | 01927-01-011927 | Designated as part of US 12 |
| SD 17 | 1.006 | 1.619 | SD 44 at Lennox | 278th Street at Lennox | 01926-01-011926 | current | |
| SD 18 | 200 | 320 | Montana state line | Mobridge | 01926-01-011926 | 01935-01-01c. 1935 | Redesignated as South Dakota Highway 8 |
| SD 19 | 86.974 | 139.971 | N-15 at the Nebraska state line south of Vermillion | SD 34 southeast of Madison | 01926-01-011926 | current | Designated as part of US 12 |
| SD 19A | 8.161 | 13.134 | SD 19/SD 46 south of Centerville | SD 19 west of Centerville | 01950-01-011950 | current | Originally part of SD 19 |
| SD 20 | 385.079 | 619.725 | Montana state line near Camp Crook | MN 40 at the Minnesota state line near Revillo | 01930-01-011930 | current | Follows US 212, US 81 and I-29 between two segments |
| SD 20A | 9.150 | 14.725 | SD 15 / SD 20 near La Bolt | CSAH 44 at the Minnesota state line | — | 01975-07-011975 | Redesignated as SD 158 |
| SD 20 Spur | 3.532 | 5.684 | Akaska | US 83 / SD 20 near Akaska | — | 01976-12-311976 | Redesignated as SD 144 |
| SD 20 Spur | 0.458 | 0.737 | North Lake Drive near Watertown | SD 20 near Watertown | — | — | Listed as SD 20P |
| SD 21 | 9.470 | 15.240 | SD 28 west of Lake Norden | US 81 east of Hayti | 01926-01-011926 | current | |
| SD 22 | 48.546 | 78.127 | CR 181 in Hazel | MN 68 at the Minnesota state line south of Gary | 01926-01-011926 | current | |
| SD 22 Spur | 3.064 | 4.931 | SD 22 near Gary | Main Avenue in Gary | — | 01976-12-311976 | Redesignated as SD 101 |
| SD 23 | — | — | — | — | — | 01976-12-311976 | Redesignated as SD 139 |
| SD 24 | 148 | 238 | Belle Fourche | Faith | 01926-01-011926 | 01960-01-011960 | Eliminated by a westward extension of SD 34 |
| SD 24A | 27 | 43 | Belle Fourche | Black Hills | 01940-01-011940 | 01948-01-011948 | |
| SD 25 | 194.524 | 313.056 | SD 50 northwest of Tabor | ND 18 at the North Dakota state line north of Claire City | 01926-01-011926 | current | Gap in route designated as CR 9 |
| SD 26 | 49.540 | 79.727 | SD 47 north of Highmore | US 281 south of Redfield | 01935-01-011935 | current | |
| SD 27 | — | — | — | Hutchinson | 01926-01-011926 | 01935-01-011935 | Redesignated as part of SD 35 |
| SD 27 | 42.639 | 68.621 | US 12 southeast of Andover | ND 32 at the North Dakota state line northeast of Kidder | 01975-07-011975 | current | Originally northern part of the path of SD 25 |
| SD 28 | 105.937 | 170.489 | US 281 west of Hitchcock | MN 271 at the Minnesota state line near Astoria | 01934-01-011934 | current | |
| SD 30 | — | — | Wyoming border southwest of Lead | Minnesota border near Elkton | 01926-01-011926 | 01927-01-011927 | |
| SD 30 | 17.077 | 27.483 | CR 6/CR 77 west of White | MN 19 at the Minnesota state line northeast of Bushnell | 01955-01-011955 | current | |
| SD 32 | 8.643 | 13.910 | I-29 (via Exit 114) | SD 13 in Flandreau | — | — | |
| SD 34 | 419.010 | 674.331 | WYO 24 at the Wyoming state line | MN 30 at the Minnesota state line | — | — | |
| SD 35 | 19 | 31 | Near Tabor | Near Emery | 01935-01-011935 | 01976-12-311976 | |
| SD 36 | 9.087 | 14.624 | US 16A in Custer State Park | SD 79 near Hermosa | — | — | |
| SD 37 | 242 | 389 | N-14 at the Nebraska state line | ND 1 at the North Dakota state line | — | — | |
| SD 37A | 2.4 | 3.9 | SD 37 south of Tripp | US 18 north of Tripp | — | — | Business loop of highway 37 in Tripp |
| SD 38 | 63.393 | 102.021 | I-90 Business in Mitchell | I-29 in Sioux Falls | — | — | |
| SD 38A | — | — | SD 38 near Sioux Falls | SD 38 in Sioux Falls | — | 01994-01-011994 | |
| SD 40 | 37.369 | 60.140 | US 16A in Keystone | BIA Highway 41 in Red Shirt | — | — | |
| SD 40A | 2.173 | 3.497 | SD 40 at Interior | Badlands National Park Interior entrance gate | — | — | Redesignated as SD 377 |
| SD 41 | 197 | 317 | Ravinia | North Dakota | 01926-01-011926 | 01952-01-01c. 1952 | Absorbed by US 281 |
| SD 42 | 71.973 | 115.829 | US 281 | IA 9 at the Iowa state line near Larchwood | — | — | Three segments |
| SD 43 | 1.131 | 1.820 | N-11 at the Nebraska state line | US 18 in Fairfax | — | — | |
| SD 44 | 379.022 | 609.977 | US 385 near Merritt | I-29 near Worthing | — | — | |
| SD 45 | 198 | 319 | SD 44 / SD 50 in Platte | ND 3 at the North Dakota state line near Ashley | — | — | |
| SD 46 | 105.535 | 169.842 | US 18 / US 281 in Pickstown | IA 10 at the Iowa state line near Hawarden | — | — | |
| SD 47 | 240.866 | 387.636 | N-137 at the Nebraska state line | North Dakota state line | — | — | |
| SD 48 | 12.469 | 20.067 | I-29 near Spink | Iowa state line near Akron | — | — | |
| SD 49 | 35.134 | 56.543 | US 18 / US 183 in Colome | SD 47 | — | — | |
| SD 50 | 212.421 | 341.858 | SD 34 near Fort Thompson | IA 3 at the Iowa state line near Richland | — | — | |
| SD 52 | 28.567 | 45.974 | SD 37 near Springfield | US 81 / SD 50 in Yankton | — | — | |
| SD 53 | 67.475 | 108.590 | Nebraska state line near Clearfield | I-90 / US 83 in Vivian | — | — | Two segments |
| SD 54 | 16 | 26 | Bonesteel | Nebraska | 01926-01-011926 | 01960-01-01c. 1960 | |
| SD 59 | 51 | 82 | Nebraska | Murdo | 01927-01-011927 | 01935-01-01c. 1935 | Replaced by US 183 |
| SD 63 | 167.455 | 269.493 | US 18 near Parmelee | ND 6 at the North Dakota state line near McLaughlin | — | — | Two segments |
| SD 65 | 70.485 | 113.435 | US 212 near Dupree | ND 31 near McIntosh | — | — | |
| SD 71 | 34.535 | 55.579 | N-2 / N-71 at the Nebraska state line near Ardmore | US 18 Bypass in Hot Springs | 01962-01-011962 | current | |
| SD 73 | 255.291 | 410.851 | N-61 near Merriman | ND 49 at the North Dakota state line near Thunder Hawk | — | — | |
| SD 75 | 29.352 | 47.237 | SD 20 near Bison | ND 8 at the North Dakota state line near Hettinger | — | — | |
| SD 79 | 213.7 | 343.9 | US 18 / US 385 at Maverick Junction | ND 22 at the North Dakota state line | — | — | |
| SD 81 | — | — | — | — | — | — | Redesignated as SD 87 |
| SD 83 | — | — | — | — | — | — | Redesignated as US 385 |
| SD 85 | — | — | — | — | — | — | Redesignated as SD 83 |
| SD 87 | 37.894 | 60.984 | US 385 near Pringle | US 16 / US 385 near Hill City | — | — | |
| SD 89 | 34.5 | 55.5 | US 18 near Minnekahta | SD 87 in Custer State Park | — | — | |
| SD 100 | — | — | I-29 south of Sioux Falls | I-90 east of Sioux Falls | 02020-01-012020 | current | Under construction |
| SD 101 | 7.312 | 11.768 | SD 10 / SD 45 near Eureka | Long Lake | — | 01976-12-311976 | Redesignated as SD 239 |
| SD 101 | 3.064 | 4.931 | SD 22 near Gary | Main Avenue in Gary | 01976-12-311976 | current | Formerly SD 22 Spur |
| SD 102 | 18.024 | 29.007 | US 12 near Roscoe | SD 47 near Hosmer | — | 01976-12-311976 | Redesignated as SD 253 |
| SD 103 | — | — | SD 46 near Beresford | Iowa state line at Hudson | — | 01994-01-011994 | |
| SD 105 | 25.010 | 40.250 | US 12 near Java | CR 55 at the North Dakota state line near Artas | — | 01976-12-311976 | Formerly SD 271 |
| SD 105 | 7.4 | 11.9 | I-29 at North Sioux City | I-29 at Jefferson | 01980-01-01c. 1980 | 01998-01-011998 | |
| SD 106 | 4.935 | 7.942 | SD 25 near Claire City | SD 127 near Hammer | 01975-07-011975 | current | |
| SD 109 | 12.167 | 19.581 | US 12 in Big Stone City | SD 15 near Hartford Beach State Park | 01975-07-011975 | current | Formerly SD 15Y |
| SD 115 | 40 | 64 | US 18 near Canton | I-29 near Dell Rapids | 01980-01-011980 | current | |
| SD 116 | — | — | — | — | — | — | Became SD 423 |
| SD 123 | 10.486 | 16.876 | US 12 near Marvin | SD 15 at Wilmot | 01975-07-011975 | current | Formerly SD 15A |
| SD 127 | 37.328 | 60.074 | SD 10 in Sisseton | ND 127 at the North Dakota state line | 01980-01-011980 | current | |
| SD 130 | 7.111 | 11.444 | US 12 / US 83 / SD 20 in Selby | SD 271 in Java | 01975-07-011975 | current | |
| SD 134 | — | — | US 12 near Mina | Edmunds–Brown county line near Mina Lake | — | 02009-01-012009 | |
| SD 136 | — | — | SD 37 in Groton | US 12 at Groton | 01975-07-011975 | 02004-01-012004 | |
| SD 139 | — | — | US 212 near Watertown | SD 50 near Watertown | 01975-07-011975 | 02010-01-012010 | Formerly SD 23 |
| SD 144 | 3.532 | 5.684 | Akaska | US 83 / SD 20 near Akaska | 01975-07-011975 | current | Formerly SD 20 Spur |
| SD 147 | — | — | — | — | — | — | Redesignated as SD 49 |
| SD 153 | 2.369 | 3.813 | SD 52 near Yankton | SD 50 near Yankton | — | — | |
| SD 158 | 9.150 | 14.725 | SD 15 / SD 20 near La Bolt | CSAH 44 at the Minnesota state line | 01975-07-011975 | current | Formerly SD 20A |
| SD 168 | 6.931 | 11.154 | US 85 near Belle Fourche | SD 79 near Castle Rock | — | — | |
| SD 203 | 0.957 | 1.540 | SD 258 near Plankinton | State Training School near Plankinton | — | — | |
| SD 204 | 2.131 | 3.430 | SD 1806 at Lake Oahe | SD 1804 at Lake Oahe | — | — | Travels over Oahe Dam |
| SD 214 | — | — | Bad River Road near Wendte | US 83 near Fort Pierre | — | 01991-01-011991 | |
| SD 218 | 8.680 | 13.969 | I-29 near Brookings | SD 13 near Elkton | — | — | Redesignated as SD 324 |
| SD 224 | 7.962 | 12.814 | Alpena | SD 37 near Huron | — | — | |
| SD 228 | — | — | I-90 at Box Elder | Near Box Elder | 01975-07-011975 | — | Former US 14/US 16 |
| SD 230 | — | — | I-90 BL at Rapid City | Box Elder | 01975-07-011975 | 02006-01-012006 | Former US 14/US 16 |
| SD 231 | 7.040 | 11.330 | I-90 near Black Hawk | SD 44 at Rapid City | — | — | |
| SD 232 | — | — | SD 79 at Rapid City | SD 445 at Rapid City | 01975-07-011975 | 01994-01-011994 | |
| SD 235 | — | — | — | — | — | — | Redesignated as US 16 Truck |
| SD 236 | — | — | Lake Herman State Park | SD 34 near Madison | — | 02006-01-012006 | |
| SD 238 | — | — | SD 79 at Rapid City | SD 44 at Rapid City | 01975-07-011975 | 02006-01-012006 | |
| SD 239 | 7.312 | 11.768 | SD 10 / SD 45 near Eureka | Long Lake | 01975-07-011975 | current | Formerly SD 101 |
| SD 240 | 40.033 | 64.427 | I-90 / US 14 at Wall | I-90 near Cottonwood | — | — | Passes through Badlands National Park |
| SD 244 | 10.457 | 16.829 | US 16 / US 385 near Hill City | US 16A near Keystone | 01975-07-011975 | current | Provides access to Mount Rushmore |
| SD 245 | — | — | SD 34 / SD 50 near Fort Thompson | SD 34 / SD 47 near Stephan | — | 01985-01-011985 | |
| SD 247 | 23.023 | 37.052 | US 12 at Roscoe | SD 10 / SD 45 near Eureka | 01975-07-011975 | current | |
| SD 248 | 117.108 | 188.467 | SD 240 near Badlands National Park | I-90 at Reliance | — | — | Former US 16 |
| SD 249 | 1.055 | 1.698 | SD 47 at Fort Thompson | SD 34 near Fort Thompson | 01975-07-011975 | current | |
| SD 251 | 15.800 | 25.428 | Nebraska state line near Gregory | US 18 / SD 47 at Gregory | — | — | |
| SD 253 | 18.024 | 29.007 | US 12 near Roscoe | SD 47 near Hosmer | 01975-07-011975 | current | Formerly SD 102 |
| SD 258 | 2.552 | 4.107 | I-90 at Plankinton | US 281 near Plankinton | — | — | |
| SD 262 | 17.563 | 28.265 | I-90 near Alexandria | SD 42 at Bridgewater | — | — | Former US 16 |
| SD 264 | — | — | SD 11 at Brandon | Minnesota state line near Valley Springs | — | 01999-01-011999 | Former US 16 |
| SD 271 | 25.010 | 40.250 | US 12 near Java | CR 55 at the North Dakota state line near Artas | 01975-07-011975 | current | Formerly SD 105 |
| SD 273 | 12.723 | 20.476 | I-90 near Kennebec | SD 1806 near Lower Brule | 01975-07-011975 | current | |
| SD 296 | 3 | 4.8 | Turner—Lincoln near Centerville | SD 17 near Centerville | — | 01991-01-011991 | |
| SD 298 | — | — | Black Hills Ordnance Depot at Igloo | SD 471 near Igloo | — | 01998-01-011998 | |
| SD 314 | 3.751 | 6.037 | SD 50 near Yankton | Yankton city limits | — | — | |
| SD 324 | 8.680 | 13.969 | I-29 near Brookings | SD 13 near Elkton | — | — | Former SD 218 |
| SD 365 | 1.5 | 2.4 | US 18 / SD 73 at Martin | North of Martin | — | 01995-01-011995 | Former US 18/SD 73 |
| SD 377 | 2.173 | 3.497 | SD 44 at Interior | Badlands National Park Interior entrance gate | — | — | |
| SD 391 | 3.362 | 5.411 | N-27 at the Nebraska state line near Denby | US 18 near Denby | — | — | |
| SD 407 | 1.786 | 2.874 | N-87 at the Nebraska state line near Pine Ridge | US 18 at Pine Ridge | — | — | |
| SD 423 | 0.5 | 0.80 | New Underwood | I-90 near New Underwood | — | 01998-01-011998 | |
| SD 435 | — | — | SD 230 at Box Elder | I-90 at Box Elder | — | 01998-01-011998 | |
| SD 437 | — | — | SD 238 at Rapid City | I-90 at Rapid City | 01975-07-011975 | 01994-01-011994 | Now part of US 16 Truck |
| SD 439 | — | — | SD 79 at Rapid City | I-90 BL at Rapid City | 01975-07-011975 | 01990-01-011990 | |
| SD 443 | — | — | SD 44 at Rapid City | SD 79 at Rapid City | 01975-07-011975 | 02005-01-012005 | |
| SD 445 | 2.372 | 3.817 | SD 231 at Rapid City | I-90 near Rapid City | 01975-07-011975 | current | |
| SD 471 | 21.981 | 35.375 | SD 71 near Rumford | US 18 at Edgemont | — | — | |
| SD 473 | 3.168 | 5.098 | US 14A / US 85 near Lead | Stewart Slope Road near Trojan | — | — | |
| SD 514 | — | — | — | — | — | — | Redesignated as parts of SD 1804 and SD 1806; became all of SD 204 |
| SD 1804 | 126.745 | 203.976 | Shore of the Missouri River south of Geddes | ND 1804 at the North Dakota state line northwest of Pollock | 01975-07-011975 | current | Four segments |
| SD 1806 | 122.603 | 197.310 | SD 273 north of Kennebec | Mission Ridge Road near Mission Ridge | 01975-07-011975 | current | |
| Former ||||||||
