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. Nebraska is not included in the national summaries below.

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

References[edit]

See also List of United States state legislatures