United States state legislatures' partisan trend
# United States state legislatures' partisan trend

This chart shows the trends in the partisan composition of the various state legislatures in the United States. In most cases the data point for each year is July 1, a time when few elections are scheduled. Most states hold legislative elections in the even numbered years, so the data points below are near the end of the term for most states. However, 2018 data is for the beginning of the year. Nebraska is not included in the national summaries below. Vacancies are not listed.

| National summary | National summary | 2020 | 2018 | 2013 | 2010 | 2008 | 2006 | 2004 |
| - | - | - | - | - | - | - | - | - |
| Lower Houses | Lower Houses | R 28-20 | R 31-18 | R 29-18, 1 tie | D 33–16 | D 30–19 | R 25–23, 1 tie | R 26–23 |
| Upper Houses | Upper Houses | R 31-19 | R 36-14 | R 29-18, 1 Coal. | D 28–20, 1 Coal. | D 28–20, 1 Coal. | 24–24, 1 tie | R 27–21, 1 tie |
| Both houses controlled by one party | Both houses controlled by one party | R 28-19, 2 split | R 32-14, 4 split | R 26-15, 8 split | D 27–14, 8 split | D 23–13, 13 split | R 20–19, 10 split | R 21–17, 11 split |
| Governor and both houses controlled by one party | Governor and both houses controlled by one party | R 21-15, 14 divided | R 26-7, 17 divided | R 24-13, 13 divided | D 16–9, 24 divided | D 14–9, 26 divided | R 12–8, 29 divided | R 12–8, 29 divided |
| State | House | 2020 | 2018 | 2013 | 2010 | 2008 | 2006 | 2004 |
| Alabama | House of Representatives | R 75-28 | R 70-33 | R 66–39 | D 60–45 | D 62–43 | D 63–42 | D 64-41 |
| Alabama | Senate | R 27-8 | R 26-7, 1 Ind. | R 22–12, 1 Ind. | D 21–13, 1 Ind. | D 22–13 | D 25–10 | D 25-10 |
| Alaska | House of Representatives | Coal. 23-17 | D 22–18 | R 24–16 | R 22–18 | R 23–17 | R 26–14 | R 27-13 |
| Alaska | Senate | R 13-7 | R 14-6 | R 13-7 | Coal. 16–4 | Coal. 15–5 | R 12–8 | R 12-8 |
| Arizona | House of Representatives | R 31-29 | R 35-25 | R 40–20 | R 36–24 | R 33–27 | R 38–22 | R 39-20, 1 Ind. |
| Arizona | Senate | R 17-13 | R 17-13 | R 21–9 | R 18–12 | R 17–13 | R 18–12 | R 17-13 |
| Arkansas | House of Representatives | R 76-25 | R 75-24 | D 55–44 | D 72–28 | D 75-25 | D 72-28 | D 70-30 |
| Arkansas | Senate | R 26-9 | R 25-9 | D 20–15 | D 27–8 | D 27-8 | D 27-8 | D 27-8 |
| California | Assembly | D 61-17, 1 Ind. | D 53-25 | D 52–28 | D 50–29, 1 Ind. | D 48-32 | D 48-32 | D 48-32 |
| California | Senate | D 29-11 | D 27-13 | D 25–15 | D 26–14 | D 25-15 | D 25-15 | D 25-15 |
| Colorado | House of Representatives | D 41-24 | D 37-27 | R 33-32 | D 38–27 | D 40-25 | D 35-30 | R 37-28 |
| Colorado | Senate | D 19-16 | R 18-17 | D 20–15 | D 20–15 | D 20-15 | D 18-17 | R 18-17 |
| Connecticut | House of Representatives | D 91-60 | D 79-72 | D 100-51 | D 114–37 | D 107-44 | D 99-52 | D 95-56 |
| Connecticut | Senate | D 22-14 | Tied D 18-18 | D 23-13 | D 24–12 | D 23-13 | D 24-12 | D 21-15 |
| Delaware | House of Representatives | D 26-15 | D 25-16 | D 26-15 | D 24–16 | R 22-19 | R 26-15 | R 29-12 |
| Delaware | Senate | D 12-9 | D 11-10 | D 14-7 | D 15–6 | D 13-8 | D 13-8 | D 13-8 |
| Florida | House of Representatives | R 72-46 | R 76-40 | R 81-39 | R 76–44 | R 78-42 | R 85-35 | R 81-39 |
| Florida | Senate | R 23-17 | R 24-15 | R 28-12 | R 26–14 | R 26-14 | R 26-14 | R 26-14 |
| Georgia | House of Representatives | R 105-75 | R 116-62 | R 113-66, 1 Ind. | R 105–74, 1 Ind. | R 107-73 | R 100-79, 1 Ind. | D 107-72, 1 Ind. |
| Georgia | Senate | R 35-21 | R 36-17 | R 36-20 | R 34–22 | R 34-22 | R 34-22 | R 30-26 |
| Hawaii | House of Representatives | D 46-5 | D 45-5 | D 43-8 | D 45–6 | D 44-7 | D 41-10 | D 36-15 |
| Hawaii | Senate | D 24-1 | D 25-0 | D 24-1 | D 23–2 | D 21-4 | D 20-5 | D 20-5 |
| Idaho | House of Representatives | R 56-14 | R 59-11 | R 57-13 | R 52–18 | R 51-19 | R 57-13 | R 54-16 |
| Idaho | Senate | R 28-7 | R 29-6 | R 28–7 | R 28–7 | R 28-7 | R 28-7 | R 28-7 |
| Illinois | House of Representatives | D 73-44 | D 67-51 | D 64-54 | D 70–48 | D 67-51 | D 65-53 | D 66-52 |
| Illinois | Senate | D 40-19 | D 37-22 | D 35-24 | D 37–22 | D 37-22 | D 31-27 1 Ind. | D 32-26, 1 Ind. |
| Indiana | House of Representatives | R 66-33 | R 70-30 | R 59-40 | D 52–47, 1 Ind. | D 51-49 | R 52-48 | D 51-49 |
| Indiana | Senate | R 40-10 | R 41-9 | R 37-13 | R 33–17 | R 33-17 | R 33-17 | R 32-18 |
| Iowa | House of Representatives | R 53-47 | R 59-41 | R 60-40 | D 56–44 | D 53-47 | R 51-49 | R 54-46 |
| Iowa | Senate | R 32-18 | R 28-20, 1 Ind. | D 26-24 | D 31–19 | D 30-20 | 25-25 | R 29-21 |
| Kansas | House of Representatives | R 84-41 | R 85-40 | R 92-33 | R 77–48 | R 78-47 | R 83-42 | R 80-45 |
| Kansas | Senate | R 29-11 | R 31-9 | R 32-8 | R 31–9 | R 30-10 | R 30-10 | R 30-10 |
| Kentucky | House of Representatives | R 62-38 | R 64-36 | D 58-42 | D 65–35 | D 64-36 | D 56-44 | D 64-36 |
| Kentucky | Senate | R 28-10 | R 27-11 | R 22–15, 1 Ind. | R 22–15, 1 Ind. | R 21-16, 1 Ind. | R 21-16, 1 Ind. | R 22-16 |
| Louisiana | House of Representatives | R 68-35, 2 Ind. | R 60-41, 3 Ind. | R 52-49, 4 Ind. | D 52–50, 3 Ind. | D 53-50, 2 Ind. | D 67-37, 1 Ind. | D 67-37, 1 Ind. |
| Louisiana | Senate | R 27-12 | R 25-14 | R 20-19 | D 22–15, 2 Ind. | D 23-16 | D 24-15 | D 25-14 |
| Maine | House of Representatives | D 87-56, 6 Ind. | D 80-70 | R 78-72, 1 Ind. | D 95–55, 1 Ind. | D 90-59, 2 Ind. | 73-73, 4 Ind, 1 Green | D 82-66, 4 Ind, 1 Green |
| Maine | Senate | D 21-14 | R 18-17 | R 20-14 | D 20–15 | D 18-17 | D 19-16 | D 18-17 |
| Maryland | House of Delegates | D 99-42 | D 91-49 | D 98-43 | D 104–36, 1 Ind. | D 104-37 | D 98-43 | D 98-43 |
| Maryland | Senate | D 32-14 | D 33-14 | D 35-12 | D 33–14 | D 33-14 | D 33-14 | D 33-14 |
| Massachusetts | House of Representatives | D 127-31, 1 Ind. | D 125-34, 1 Ind. | D 128-31 | D 143–16, 1 Ind. | D 141-19 | D 139-21 | D 136-23, 1 Ind. |
| Massachusetts | Senate | D 36-4 | D 33-6 | D 36-4 | D 35–5 | D 35-5 | D 34-6 | D 33-7 |
| Michigan | House of Representatives | R 58-51 | R 63-47 | R 63-47 | D 67–43 | D 58-52 | R 58-49 | R 63-46 |
| Michigan | Senate | R 22-16 | R 27-11 | R 26-12 | R 21–17 | R 21-17 | R 22-16 | R 22-16 |
| Minnesota | House of Representatives | D 75-55, 4 NP | R 76-57 | R 72-62 | DFL 87–47 | DFL 85-48, 1 Ind. | R 68-66 | R 81-53 |
| Minnesota | Senate | R 35-32 | R 34-33 | R 37-30 | DFL 46–21 | DFL 45-22 | DFL 37-29, 1 Ind. | D 35-31, 1 Ind. |
| Mississippi | House of Representatives | R 73-45, 1 Ind. | R 73-47 | D 72-50 | D 74–48 | D 75-47 | D 75-47 | D 76-46 |
| Mississippi | Senate | R 34-16 | R 31-19 | R 27-25 | D 27–25 | D 27-25 | D 28-24 | D 29-23 |
| Missouri | House of Representatives | R 113-48 | R 112-45 | R 106-57 | R 89–74 | R 92-71 | R 96-66 | R 90-73 |
| Missouri | Senate | R 23-8 | R 24-9 | R 26-8 | R 23–11 | R 20-14 | R 23-11 | R 20-14 |
| Montana | House of Representatives | R 58-42 | R 59-41 | R 68-32 | D 50–50 | R 50-49, 1 Const. | 50-50 | R 53-47 |
| Montana | Senate | R 30-20 | R 32-18 | R 28-22 | R 27–23 | D 26-24 | D 26-24 | R 29-21 |
| Nebraska | Unicameral and non–partisan Senate with 49 members | Unicameral and non–partisan Senate with 49 members | Unicameral and non–partisan Senate with 49 members | Unicameral and non–partisan Senate with 49 members | Unicameral and non–partisan Senate with 49 members | Unicameral and non–partisan Senate with 49 members | Unicameral and non–partisan Senate with 49 members |
| Nevada | Assembly | D 29-13 | D 27-14 | D 26-16 | D 28–14 | D 27-15 | D 26-16 | D 23-19 |
| Nevada | Senate | D 13-8 | D 11-9 | D 11-10 | D 12–9 | R 11-10 | R 12-9 | R 13-8 |
| New Hampshire | House of Representatives | D 231-158, 1 Ind. | R 219-174, 3 Lib. | R 298-102 | D 225–175 | D 239-161 | R 247-152 | R 279-121 |
| New Hampshire | Senate | D 14-10 | R 14-10 | R 19-5 | D 14–10 | D 14-10 | R 16-8 | R 18-6 |
| New Jersey | General Assembly | D 52-28 | D 52-28 | D 47–33 | D 47–33 | D 48-32 | D 49-31 | D 47-33 |
| New Jersey | Senate | D 25-15 | D 24-16 | D 24–16 | D 23–17 | D 23-17 | D 22-18 | D 22-18 |
| New Mexico | House of Representatives | D 45-24 | D 38-32 | D 37-33 | D 45–25 | D 42-28 | D 42-28 | D 43-27 |
| New Mexico | Senate | D 26-16 | D 26-16 | D 27-15 | D 27–15 | D 24-18 | D 24-18 | D 24-18 |
| New York | Assembly | D 103-42, 1 Ind. | D 106-41, 1 IP | D 100-48, 2 Vac. | D 108–42 | D 108-42 | D 105-45 | D 102-47 |
| New York | Senate | D 40-20 | R 32-31 | R 32-30 | D 32–30 | R 32-30 | R 35-27 | R 37-24 |
| North Carolina | House of Representatives | R 64-55 | R 75-45 | R 67-52 | D 68–52 | D 68-52 | D 63-57 | R 61-59 |
| North Carolina | Senate | R 28-21 | R 35-15 | R 31-19 | D 30–20 | D 31-19 | D 29-21 | D 27-23 |
| North Dakota | House of Representatives | R 79-15 | R 81-13 | R 69-25 | R 58–36 | R 61-33 | R 67-27 | R 66-28 |
| North Dakota | Senate | R 37-10 | R 38-9 | R 35-12 | R 26–21 | R 26-21 | R 32-15 | R 31-16 |
| Ohio | House of Representatives | R 61-38 | R 65-33 | R 59-40 | D 53–46 | R 53-46 | R 60-38, 1 Vac. | R 62-37 |
| Ohio | Senate | R 24-9 | R 23-9 | R 23-10 | R 21–12 | R 21-12 | R 22-11 | R 22-11 |
| Oklahoma | House of Representatives | R 77-23 | R 71-28 | R 70-31 | R 62–39 | R 57-44 | R 57-44 | D 53-48 |
| Oklahoma | Senate | R 38-9 | R 39-7 | R 32-16 | R 26–22 | D 24-24 | D 25-22 | D 28-20 |
| Oregon | House of Representatives | D 38-22 | D 35-24 | 30-30 | D 36–24 | D 31-29 | R 33-27 | R 35-25 |
| Oregon | State Senate | D 18-12 | D 17-13 | D 16-14 | D 18–12 | D 18-11, 1 Ind. | D 18-12 | 15-15 |
| Pennsylvania | House of Representatives | R 109-93 | R 121-80 | R 112-91 | D 104–99 | D 102-101 | R 109-93 | R 109-94 |
| Pennsylvania | Senate | R 28-21, 1 Ind. | R 34-16 | R 30–20 | R 30–20 | R 29-21 | R 29-20 | R 29-21 |
| Rhode Island | House of Representatives | D 66-8, 1 Ind. | D 64-11 | D 65-10 | D 69–6 | D 60-15 | D 60-15 | D 63-11, 1 Ind. |
| Rhode Island | Senate | D 33-5 | D 33-5 | D 29-8 1 Ind. | D 33–4, 1 Ind. | D 33-5 | D 33-5 | D 32-6 |
| South Carolina | House of Representatives | R 78-45 | R 78-43 | R 75-48 1 Ind. | R 71–53 | R 73-51 | R 73-51 | R 73-51 |
| South Carolina | Senate | R 27-19 | R 28-18 | R 27-19 | R 27–19 | R 26-20 | R 26-20 | R 25-21 |
| South Dakota | House of Representatives | R 59-11 | R 59-10 | R 50-19 1 Ind. | R 46–24 | R 50-20 | R 51-19 | R 49-21 |
| South Dakota | Senate | R 30-5 | R 29-6 | R 30-5 | R 20–14, 1 Ind. | R 20-15 | R 25-10 | R 26-9 |
| Tennessee | House of Representatives | R 73-26 | R 74-25 | R 64-33 1 Ind. | R 50–48, 1 Ind. | D 53-46 | D 53-46 | D 54-45 |
| Tennessee | Senate | R 28-5 | R 25-5 | R 19-13; 1 Vac. | R 19–14 | R 16-16, 1 Ind. | R 17-15 | D 18-15 |
| Texas | House of Representatives | R 83-67 | R 95-55 | R 101-49 | R 76–74 | R 79-71 | R 86-64 | R 88-62 |
| Texas | Senate | R 19-12 | R 20-11 | R 19–12 | R 19–12 | R 20-11 | R 19-12 | R 19-12 |
| Utah | House of Representatives | R 59-16 | R 62-13 | R 58-17 | R 53–22 | R 55-20 | R 56-19 | R 56-19 |
| Utah | Senate | R 23-6 | R 24-5 | R 22-7 | R 21–8 | R 21-8 | R 21-8 | R 22-7 |
| Vermont | House of Representatives | D 95-44, 7 Prog, 5 Ind. | D 83-53, 7 Prog, 7 Ind. | D 95–48, 4 Prog, 3 Ind. | D 95–48, 5 Prog, 2 Ind. | D 93-49, 6 Prog. 2 Ind. | D 83-60, 6 Prog, 1 Ind. | R 73-71, 4 Prog, 2 Ind. |
| Vermont | Senate | D 22-6, 2 Prog. | D 21-7, 2 Prog. | D 22–8, 1 Prog. | D 22–7, 1 Prog. | D 23-7 | D 21-9 | D 19-11 |
| Virginia | House of Delegates | D 55-44 | R 51-49 | R 59–39, 2 Ind. | R 59–39, 2 Ind. | R 53-45, 2 Ind. | R 56-40, 3 Ind. | R 61-37, 2 Ind. |
| Virginia | Senate | D 21-19 | R 21-19 | D 22–18 | D 22–18 | D 21-19 | R 23-17 | R 24-16 |
| Washington | House of Representatives | D 57-14 | D 50-48 | D 56-42 | D 64–34 | D 63-35 | D 56-42 | D 52-46 |
| Washington | Senate | D 29-20 | D 25-24 | D 27-22 | D 31–18 | D 32-17 | D 26-23 | R 25-24 |
| West Virginia | House of Delegates | R 58-41, 1 Ind. | R 62-35, 1 Ind. | D 65-35 | D 79–21 | D 72-28 | D 68-32 | D 69-31 |
| West Virginia | Senate | R 20-14 | R 22-12 | D 28–6 | D 28–6 | D 23-11 | D 21-13 | D 24-10 |
| Wisconsin | Assembly | R 63-34 | R 63-35 | R 60-38 1 Ind. | D 52–46, 1 Ind. | R 52-47 | R 59-39 | R 59-40 |
| Wisconsin | Senate | R 18-13 | R 19-13 | R 19-14 | D 18–15 | D 18-15 | R 19-14 | R 18-15 |
| Wyoming | House of Representatives | R 50-9, 1 Ind. | R 51-9 | R 50-10 | R 41–18 | R 43-17 | R 46-14 | R 45-15 |
| Wyoming | Senate | R 27-3 | R 27-3 | R 26-4 | R 23–7 | R 23-7 | R 23-7 | R 20-10 |
| National summary | National summary | 2020 | 2018 | 2013 | 2010 | 2008 | 2006 | 2004 |
| Lower Houses | Lower Houses | R 28-20 | R 31-18 | R 29-18, 1 tie | D 33–16 | D 30–19 | R 25–23, 1 tie | R 26–23 |
| Upper Houses | Upper Houses | R 31-19 | R 36-14 | R 29-18, 1 Coal. | D 28–20, 1 Coal. | D 28–20, 1 Coal. | 24–24, 1 tie | R 27–21, 1 tie |
| Both houses controlled by one party | Both houses controlled by one party | R 28-19, 2 split | R 32-14, 4 split | R 26-15, 8 split | D 27–14, 8 split | D 23–13, 13 split | R 20–19, 10 split | R 21–17, 11 split |
| Governor and both houses controlled by one party | Governor and both houses controlled by one party | R 21-15, 14 divided | R 26-7, 17 divided | R 24-13, 13 divided | D 16–9, 24 divided | D 14–9, 26 divided | R 12–8, 29 divided | R 12–8, 29 divided |
