United States state legislatures' partisan trend

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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 summary2020201820132010200820062004
Lower Houses R 28-20R 31-18R 29-18, 1 tieD 33–16D 30–19R 25–23, 1 tieR 26–23
Upper Houses R 31-19R 36-14R 29-18, 1 Coal.D 28–20, 1 Coal.D 28–20, 1 Coal.24–24, 1 tieR 27–21, 1 tie
Both houses controlled by one partyR 28-19, 2 splitR 32-14, 4 splitR 26-15, 8 splitD 27–14, 8 splitD 23–13, 13 splitR 20–19, 10 splitR 21–17, 11 split
Governor and both houses controlled by one partyR 21-15, 14 dividedR 26-7, 17 dividedR 24-13, 13 dividedD 16–9, 24 dividedD 14–9, 26 dividedR 12–8, 29 dividedR 12–8, 29 divided
StateHouse2020201820132010200820062004
Alabama House of Representatives R 75-28R 70-33R 66–39D 60–45D 62–43D 63–42D 64-41
Senate R 27-8R 26-7, 1 Ind.R 22–12, 1 Ind.D 21–13, 1 Ind.D 22–13D 25–10D 25-10
Alaska House of Representatives Coal. 23-17D 22–18R 24–16R 22–18R 23–17R 26–14R 27-13
Senate R 13-7R 14-6R 13-7Coal. 16–4Coal. 15–5R 12–8R 12-8
Arizona House of Representatives R 31-29R 35-25R 40–20R 36–24R 33–27R 38–22R 39-20, 1 Ind.
Senate R 17-13R 17-13R 21–9R 18–12R 17–13R 18–12R 17-13
Arkansas House of Representatives R 76-25R 75-24D 55–44D 72–28D 75-25D 72-28D 70-30
Senate R 26-9R 25-9D 20–15D 27–8D 27-8D 27-8D 27-8
California Assembly D 61-17, 1 Ind.D 53-25D 52–28D 50–29, 1 Ind.D 48-32D 48-32D 48-32
Senate D 29-11D 27-13D 25–15D 26–14D 25-15D 25-15D 25-15
Colorado House of Representatives D 41-24D 37-27R 33-32D 38–27D 40-25D 35-30R 37-28
Senate D 19-16R 18-17D 20–15D 20–15D 20-15D 18-17R 18-17
Connecticut House of Representatives D 91-60D 79-72D 100-51D 114–37D 107-44D 99-52D 95-56
Senate D 22-14Tied D 18-18D 23-13D 24–12D 23-13D 24-12D 21-15
Delaware House of Representatives D 26-15D 25-16D 26-15D 24–16R 22-19R 26-15R 29-12
Senate D 12-9D 11-10D 14-7D 15–6D 13-8D 13-8D 13-8
Florida House of Representatives R 72-46R 76-40R 81-39R 76–44R 78-42R 85-35R 81-39
Senate R 23-17R 24-15R 28-12R 26–14R 26-14R 26-14R 26-14
Georgia House of Representatives R 105-75R 116-62R 113-66, 1 Ind.R 105–74, 1 Ind.R 107-73R 100-79, 1 Ind.D 107-72, 1 Ind.
Senate R 35-21R 36-17R 36-20R 34–22R 34-22R 34-22R 30-26
Hawaii House of Representatives D 46-5D 45-5D 43-8D 45–6D 44-7D 41-10D 36-15
Senate D 24-1D 25-0D 24-1D 23–2D 21-4D 20-5D 20-5
Idaho House of Representatives R 56-14R 59-11R 57-13R 52–18R 51-19R 57-13R 54-16
Senate R 28-7R 29-6R 28–7R 28–7R 28-7R 28-7R 28-7
Illinois House of Representatives D 73-44D 67-51D 64-54D 70–48D 67-51D 65-53D 66-52
Senate D 40-19D 37-22D 35-24D 37–22D 37-22D 31-27 1 Ind.D 32-26, 1 Ind.
Indiana House of Representatives R 66-33R 70-30R 59-40D 52–47, 1 Ind.D 51-49R 52-48D 51-49
Senate R 40-10R 41-9R 37-13R 33–17R 33-17R 33-17R 32-18
Iowa House of Representatives R 53-47R 59-41R 60-40D 56–44D 53-47R 51-49R 54-46
Senate R 32-18R 28-20, 1 Ind.D 26-24D 31–19D 30-2025-25R 29-21
Kansas House of Representatives R 84-41R 85-40R 92-33R 77–48R 78-47R 83-42R 80-45
Senate R 29-11R 31-9R 32-8R 31–9R 30-10R 30-10R 30-10
Kentucky House of Representatives R 62-38R 64-36D 58-42D 65–35D 64-36D 56-44D 64-36
Senate R 28-10R 27-11R 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.
Senate R 27-12R 25-14R 20-19D 22–15, 2 Ind.D 23-16D 24-15D 25-14
Maine House of Representatives D 87-56, 6 Ind.D 80-70R 78-72, 1 Ind.D 95–55, 1 Ind.D 90-59, 2 Ind.73-73, 4 Ind, 1 GreenD 82-66, 4 Ind, 1 Green
Senate D 21-14R 18-17R 20-14D 20–15D 18-17D 19-16D 18-17
Maryland House of Delegates D 99-42D 91-49D 98-43D 104–36, 1 Ind.D 104-37D 98-43D 98-43
Senate D 32-14D 33-14D 35-12D 33–14D 33-14D 33-14D 33-14
Massachusetts House of Representatives D 127-31, 1 Ind.D 125-34, 1 Ind.D 128-31D 143–16, 1 Ind.D 141-19D 139-21D 136-23, 1 Ind.
Senate D 36-4D 33-6D 36-4D 35–5D 35-5D 34-6D 33-7
Michigan House of Representatives R 58-51R 63-47R 63-47D 67–43D 58-52R 58-49R 63-46
Senate R 22-16R 27-11R 26-12R 21–17R 21-17R 22-16R 22-16
Minnesota House of Representatives D 75-55, 4 NPR 76-57R 72-62DFL 87–47DFL 85-48, 1 Ind.R 68-66R 81-53
Senate R 35-32R 34-33R 37-30DFL 46–21DFL 45-22DFL 37-29, 1 Ind.D 35-31, 1 Ind.
Mississippi House of Representatives R 73-45, 1 Ind.R 73-47D 72-50D 74–48D 75-47D 75-47D 76-46
Senate R 34-16R 31-19R 27-25D 27–25D 27-25D 28-24D 29-23
Missouri House of Representatives R 113-48R 112-45R 106-57R 89–74R 92-71R 96-66R 90-73
Senate R 23-8R 24-9R 26-8R 23–11R 20-14R 23-11R 20-14
Montana House of Representatives R 58-42R 59-41R 68-32D 50–50R 50-49, 1 Const.50-50R 53-47
Senate R 30-20R 32-18R 28-22R 27–23D 26-24D 26-24R 29-21
Nebraska Unicameral and non–partisan Senate with 49 members
Nevada Assembly D 29-13D 27-14D 26-16D 28–14D 27-15D 26-16D 23-19
Senate D 13-8D 11-9D 11-10D 12–9R 11-10R 12-9R 13-8
New Hampshire House of Representatives D 231-158, 1 Ind.R 219-174, 3 Lib.R 298-102D 225–175D 239-161R 247-152R 279-121
Senate D 14-10R 14-10R 19-5D 14–10D 14-10R 16-8R 18-6
New Jersey General Assembly D 52-28D 52-28D 47–33D 47–33D 48-32D 49-31D 47-33
Senate D 25-15D 24-16D 24–16D 23–17D 23-17D 22-18D 22-18
New Mexico House of Representatives D 45-24D 38-32D 37-33D 45–25D 42-28D 42-28D 43-27
Senate D 26-16D 26-16D 27-15D 27–15D 24-18D 24-18D 24-18
New York Assembly D 103-42, 1 Ind.D 106-41, 1 IPD 100-48, 2 Vac.D 108–42D 108-42D 105-45D 102-47
Senate D 40-20R 32-31R 32-30D 32–30R 32-30R 35-27R 37-24
North Carolina House of Representatives R 64-55R 75-45R 67-52D 68–52D 68-52D 63-57R 61-59
Senate R 28-21R 35-15R 31-19D 30–20D 31-19D 29-21D 27-23
North Dakota House of Representatives R 79-15R 81-13R 69-25R 58–36R 61-33R 67-27R 66-28
Senate R 37-10R 38-9R 35-12R 26–21R 26-21R 32-15R 31-16
Ohio House of Representatives R 61-38R 65-33R 59-40D 53–46R 53-46R 60-38, 1 Vac.R 62-37
Senate R 24-9R 23-9R 23-10R 21–12R 21-12R 22-11R 22-11
Oklahoma House of Representatives R 77-23R 71-28R 70-31R 62–39R 57-44R 57-44D 53-48
Senate R 38-9R 39-7R 32-16R 26–22D 24-24D 25-22D 28-20
Oregon House of Representatives D 38-22D 35-2430-30D 36–24D 31-29R 33-27R 35-25
State Senate D 18-12D 17-13D 16-14D 18–12D 18-11, 1 Ind.D 18-1215-15
Pennsylvania House of Representatives R 109-93R 121-80R 112-91D 104–99D 102-101R 109-93R 109-94
Senate R 28-21, 1 Ind.R 34-16R 30–20R 30–20R 29-21R 29-20R 29-21
Rhode Island House of Representatives D 66-8, 1 Ind.D 64-11D 65-10D 69–6D 60-15D 60-15D 63-11, 1 Ind.
Senate D 33-5D 33-5D 29-8 1 Ind.D 33–4, 1 Ind.D 33-5D 33-5D 32-6
South Carolina House of Representatives R 78-45R 78-43R 75-48 1 Ind.R 71–53R 73-51R 73-51R 73-51
Senate R 27-19R 28-18R 27-19R 27–19R 26-20R 26-20R 25-21
South Dakota House of Representatives R 59-11R 59-10R 50-19 1 Ind.R 46–24R 50-20R 51-19R 49-21
Senate R 30-5R 29-6R 30-5R 20–14, 1 Ind.R 20-15R 25-10R 26-9
Tennessee House of Representatives R 73-26R 74-25R 64-33 1 Ind.R 50–48, 1 Ind.D 53-46D 53-46D 54-45
Senate R 28-5R 25-5R 19-13; 1 Vac.R 19–14R 16-16, 1 Ind.R 17-15D 18-15
Texas House of Representatives R 83-67R 95-55R 101-49R 76–74R 79-71R 86-64R 88-62
Senate R 19-12R 20-11R 19–12R 19–12R 20-11R 19-12R 19-12
Utah House of Representatives R 59-16R 62-13R 58-17R 53–22R 55-20R 56-19R 56-19
Senate R 23-6R 24-5R 22-7R 21–8R 21-8R 21-8R 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.
Senate D 22-6, 2 Prog.D 21-7, 2 Prog.D 22–8, 1 Prog.D 22–7, 1 Prog.D 23-7D 21-9D 19-11
Virginia House of Delegates D 55-44R 51-49R 59–39, 2 Ind.R 59–39, 2 Ind.R 53-45, 2 Ind.R 56-40, 3 Ind.R 61-37, 2 Ind.
Senate D 21-19R 21-19D 22–18D 22–18D 21-19R 23-17R 24-16
Washington House of Representatives D 57-14D 50-48D 56-42D 64–34D 63-35D 56-42D 52-46
Senate D 29-20D 25-24D 27-22D 31–18D 32-17D 26-23R 25-24
West Virginia House of Delegates R 58-41, 1 Ind.R 62-35, 1 Ind.D 65-35D 79–21D 72-28D 68-32D 69-31
Senate R 20-14R 22-12D 28–6D 28–6D 23-11D 21-13D 24-10
Wisconsin Assembly R 63-34R 63-35R 60-38 1 Ind.D 52–46, 1 Ind.R 52-47R 59-39R 59-40
Senate R 18-13R 19-13R 19-14D 18–15D 18-15R 19-14R 18-15
Wyoming House of Representatives R 50-9, 1 Ind.R 51-9R 50-10R 41–18R 43-17R 46-14R 45-15
Senate R 27-3R 27-3R 26-4R 23–7R 23-7R 23-7R 20-10
National summary2020201820132010200820062004
Lower Houses R 28-20R 31-18R 29-18, 1 tieD 33–16D 30–19R 25–23, 1 tieR 26–23
Upper Houses R 31-19R 36-14R 29-18, 1 Coal.D 28–20, 1 Coal.D 28–20, 1 Coal.24–24, 1 tieR 27–21, 1 tie
Both houses controlled by one partyR 28-19, 2 splitR 32-14, 4 splitR 26-15, 8 splitD 27–14, 8 splitD 23–13, 13 splitR 20–19, 10 splitR 21–17, 11 split
Governor and both houses controlled by one partyR 21-15, 14 dividedR 26-7, 17 dividedR 24-13, 13 dividedD 16–9, 24 dividedD 14–9, 26 dividedR 12–8, 29 dividedR 12–8, 29 divided

See also

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