2018 United States state legislative elections explained

Election Name:	2018 United States state legislative elections
Country:	United States
Type:	legislative
Previous Election:	2017 United States state legislative elections
Previous Year:	2017
Next Election:	2019 United States state legislative elections
Next Year:	2019
Seats For Election:	87 legislative chambers 46 states
Election Date:	November 6, 2018
Ongoing:	no
Party1:	Republican Party (US)
1Data1:	67
2Data1:	61
3Data1:	6
Party2:	Democratic Party (US)
1Data2:	30
2Data2:	37
3Data2:	7
Party3:	Coalition
1Data3:	1
2Data3:	1
1Blank:	Chambers before
2Blank:	Chambers after
3Blank:	Overall change
Map Size:	320px
Map2 Size:	320px
Map2 Caption:	Map of lower house elections:
Colour3:	d9b2d9

The 2018 United States state legislative elections were held on November 6, 2018, for 87 state legislative chambers in 46 states. Across the fifty states, approximately 56 percent of all upper house seats and 92 percent of all lower house seats were up for election. Additionally, six territorial chambers in four territories and the District of Columbia were up as well.

Democrats flipped at least 350 state legislative seats,^[1] picking up most of those seats in states where President Trump's approval rating was relatively low. Six chambers—the Colorado Senate, New Hampshire House, New Hampshire Senate, Minnesota House, Maine Senate and New York State Senate—flipped from Republican to Democratic control.^[2] Additionally the Connecticut Senate went from being evenly divided to a Democratic majority. Democrats also broke Republican legislative supermajorities in North Carolina,^[3] Michigan and Pennsylvania and gained a legislative supermajority in both houses of the California, Illinois and Oregon legislatures.^[4] ^[5]

Summary table

Regularly-scheduled elections were held in 87 of the 99 state legislative chambers in the United States; nationwide, regularly-scheduled elections were held for 6,064 of the 7,383 legislative seats. Most legislative chambers held elections for all seats, but some legislative chambers that use staggered elections held elections for only a portion of the total seats in the chamber. The chambers that were not up for election either hold regularly-scheduled elections in odd-numbered years, or have four-year terms and hold all regularly-scheduled elections in presidential election years.

Note that this table only covers regularly-scheduled elections; additional special elections took place concurrently with these regularly-scheduled elections.

State	Upper House^[6]				Lower House
State	Seats up	Total	% up	Term	Seats up	Total	% up	Term
Alabama	35	35	100	4	105	105	100	4
Alaska	10	20	50	4	40	40	100	2
Arizona	30	30	100	2	60	60	100	2
Arkansas	18	35	51	2/4	100	100	100	2
California	20	40	50	4	80	80	100	2
Colorado	17	35	49	4	65	65	100	2
Connecticut	36	36	100	2	151	151	100	2
Delaware	10	21	48	2/4	41	41	100	2
Florida	20	40	50	2/4	120	120	100	2
Georgia	56	56	100	2	180	180	100	2
Hawaii	12	25	48	2/4	51	51	100	2
Idaho	35	35	100	2	70	70	100	2
Illinois	39	59	66	2/4	118	118	100	2
Indiana	25	50	50	4	100	100	100	2
Iowa	25	50	50	4	100	100	100	2
Kansas	0	40	0	4	125	125	100	2
Kentucky	19	38	50	4	100	100	100	2
Louisiana	0	39	0	4	0	105	0	4
Maine	35	35	100	2	151	151	100	2
Maryland	47	47	100	4	141	141	100	4
Massachusetts	40	40	100	2	160	160	100	2
Michigan	38	38	100	4	110	110	100	2
Minnesota	0	67	0	2/4	134	134	100	2
Mississippi	0	52	0	4	0	122	0	4
Missouri	17	34	50	4	163	163	100	2
Montana	25	50	50	4	100	100	100	2
Nebraska	24	49	49	4	N/A (unicameral)
Nevada	11	21	52	4	42	42	100	2
New Hampshire	24	24	100	2	400	400	100	2
New Jersey	0	40	0	2/4	0	80	0	2
New Mexico	0	42	100	4	70	70	100	2
New York	63	63	100	2	150	150	100	2
North Carolina	50	50	100	2	120	120	100	2
North Dakota	24	47	51	4	47	94	50	4
Ohio	16	33	52	4	99	99	100	2
Oklahoma	24	48	50	4	101	101	100	2
Oregon	15	30	50	4	60	60	100	2
Pennsylvania	25	50	50	4	203	203	100	2
Rhode Island	38	38	100	2	75	75	100	2
South Carolina	0	46	0	4	124	124	100	2
South Dakota	35	35	100	2	70	70	100	2
Tennessee	17	33	52	4	99	99	100	2
Texas	15	31	48	2/4	150	150	100	2
Utah	14	29	48	4	75	75	100	2
Vermont	30	30	100	2	150	150	100	2
Virginia	0	40	0	4	0	100	0	2
Washington	25	49	49	4	98	98	100	2
West Virginia	17	34	50	4	100	100	100	2
Wisconsin	17	33	52	4	99	99	100	2
Wyoming	15	30	50	4	60	60	100	2
	Total	1106	1972	56	N/A	4958	5411	92	N/A

Electoral predictions

News sources predicted Democrats would make significant gains in state legislative control, flipping multiple chambers and narrowing Republican majorities in many others.^[7]

Ratings are designated as follows:

"Tossup": Competitive, no advantage
"Lean": Competitive, slight advantage
"Likely": Not competitive, but opposition could make significant gains
"Safe": Not competitive at all

State	Chamber	Lastelection	Governing	Result
Alabama	Senate	data-sort-value="77.1"	R 27–8		data-sort-value="77.1"	R 27–8
Alabama	House of Representatives	data-sort-value="68.6"	R 72–33		data-sort-value="73.3"	R 77–28
Alaska	Senate	data-sort-value="70.0"	R 14–6		data-sort-value="65.0"	R 13–7
Alaska	House of Representatives	data-sort-value="-55.0"	Coal. 22–18		data-sort-value="-57.5"	Coal. 23–15–2
Arizona	Senate	data-sort-value="56.7"	R 17–13		data-sort-value="56.7"	R 17–13
Arizona	House of Representatives	data-sort-value="58.3"	R 35–25		data-sort-value="51.7"	R 31–29
Arkansas	Senate	data-sort-value="74.3"	R 26–9		data-sort-value="74.3"	R 26–9
Arkansas	House of Representatives	data-sort-value="73.0"	R 73–27		data-sort-value="76.0"	R 76–24
California	State Senate	data-sort-value="-67.5"	D 27–13		data-sort-value="-72.3"	D 29–11
California	State Assembly	data-sort-value="-68.8"	D 55–25		data-sort-value="-76.3"	D 61–18–1
Colorado	Senate	data-sort-value="51.4"	R 18–17		data-sort-value="-54.3"	D 19–16
Colorado	House of Representatives	data-sort-value="-56.9"	D 37–28		data-sort-value="-63.1"	D 41–24
Connecticut	State Senate	data-sort-value="0"	18–18		data-sort-value="-61.1"	D 22–14
Connecticut	House of Representatives	data-sort-value="-53.0"	D 80–71		data-sort-value="-64.2"	D 97–54
Delaware	Senate	data-sort-value="-52.4"	D 11–10		data-sort-value="-57.1"	D 12–9
Delaware	House of Representatives	data-sort-value="-61.0"	D 25–16		data-sort-value="-63.4"	D 26–15
Florida	Senate	data-sort-value="62.5"	R 25–15		data-sort-value="57.5"	R 23–17
Florida	House of Representatives	data-sort-value="65.8"	R 79–41		data-sort-value="60.8"	R 73–47
Georgia	State Senate	data-sort-value="67.9"	R 38–18		data-sort-value="62.5"	R 35–21
Georgia	House of Representatives	data-sort-value="65.6"	R 118–62		data-sort-value="58.3"	R 105–75
Hawaii	Senate	data-sort-value="-100.0"	D 25–0		data-sort-value="-96.0"	D 24–1
Hawaii	House of Representatives	data-sort-value="-88.2"	D 45–6		data-sort-value="-90.2"	D 46–5
Idaho	Senate	data-sort-value="82.3"	R 29–6		data-sort-value="80.0"	R 28–7
Idaho	House of Representatives	data-sort-value="84.3"	R 59–11		data-sort-value="80.0"	R 56–14
Illinois	Senate	data-sort-value="-62.7"	D 37–22		data-sort-value="-67.8"	D 40–19
Illinois	House of Representatives	data-sort-value="-56.8"	D 67–51		data-sort-value="-62.7"	D 74–44
Indiana	Senate	data-sort-value="82.0"	R 41–9		data-sort-value="80.0"	R 40–10
Indiana	House of Representatives	data-sort-value="70.0"	R 70–30		data-sort-value="67.0"	R 67–33
Iowa	Senate	data-sort-value="58.0"	R 29–20–1		data-sort-value="64.0"	R 32–18
Iowa	House of Representatives	data-sort-value="59.0"	R 59–41		data-sort-value="53.0"	R 53–47
Kansas		House of Representatives	data-sort-value="68.0"	R 85–40		data-sort-value="67.2"	R 84–41
Kentucky	Senate	data-sort-value="71.1"	R 27–11		data-sort-value="73.7"	R 28–10
Kentucky	House of Representatives	data-sort-value="64.0"	R 64–36		data-sort-value="61.0"	R 61–39
Maine	Senate	data-sort-value="51.4"	R 18–17		data-sort-value="-60.0"	D 21–14
Maine	House of Representatives	data-sort-value="-51.0"	D 77–72–2		data-sort-value="-59.0"	D 89–56–6
Maryland	Senate	data-sort-value="-70.2"	D 33–14		data-sort-value="-68.1"	D 32–15
Maryland	House of Representatives	data-sort-value="-65.2"	D 92–49		data-sort-value="-70.2"	D 99–42
Massachusetts	Senate	data-sort-value="-85.0"	D 34–6		data-sort-value="-85.0"	D 34–6
Massachusetts	House of Representatives	data-sort-value="-78.1"	D 125–35		data-sort-value="-79.4"	D 127–32–1
Michigan	Senate	data-sort-value="71.1"	R 27–11		data-sort-value="57.9"	R 22–16
Michigan		House of Representatives	data-sort-value="57.3"	R 63–47		data-sort-value="50.9"	R 58–52
Minnesota		House of Representatives	data-sort-value="57.5"	R 77–57		data-sort-value="-56.0"	D 75–59
Missouri	Senate	data-sort-value="73.5"	R 25–9		data-sort-value="70.6"	R 23–10
Missouri	House of Representatives	data-sort-value="71.8"	R 117–46		data-sort-value="71.2"	R 116–47
Montana	Senate	data-sort-value="64.0"	R 32–18		data-sort-value="60.0"	R 30–20
Montana	House of Representatives	data-sort-value="59.0"	R 59–41		data-sort-value="58.0"	R 58–42
Nevada	Senate	data-sort-value="-52.4"	D 11–10		data-sort-value="-61.9"	D 13–8
Nevada	Assembly	data-sort-value="-64.3"	D 27–15		data-sort-value="-61.9"	D 29–13
New Hampshire	Senate	data-sort-value="58.3"	R 14–10		data-sort-value="-58.3"	D 14–10
New Hampshire	House of Representatives	data-sort-value="56.8"	R 227–173		data-sort-value="-58.5"	D 234–166
New Mexico		House of Representatives	data-sort-value="-54.3"	D 38–32		data-sort-value="-65.7"	D 46–24
New York	State Senate	data-sort-value="61.9"	Coal. 39–24		data-sort-value="-63.5"	D 40–23
New York	State Assembly	data-sort-value="-70.7"	D 106–43–1		data-sort-value="-70.7"	D 105–44–1
North Carolina	Senate	data-sort-value="70.0"	R 35–15		data-sort-value="58.0"	R 29–21
North Carolina	House of Representatives	data-sort-value="61.7"	R 74–46		data-sort-value="54.1"	R 65–55
North Dakota	Senate	data-sort-value="80.7"	R 38–9		data-sort-value="78.7"	R 37–10
North Dakota	House of Representatives	data-sort-value="86.2"	R 81–13		data-sort-value="84.0"	R 79–15
Ohio	Senate	data-sort-value="72.7"	R 24–9		data-sort-value="72.7"	R 24–9
Ohio	House of Representatives	data-sort-value="66.7"	R 66–33		data-sort-value="61.6"	R 61–38
Oklahoma	Senate	data-sort-value="87.5"	R 42–6		data-sort-value="81.3"	R 38–9
Oklahoma	House of Representatives	data-sort-value="74.3"	R 75–26		data-sort-value="76.2"	R 77–23
Oregon	State Senate	data-sort-value="-56.7"	D 17–13		data-sort-value="-60.0"	D 18–12
Oregon	House of Representatives	data-sort-value="-58.3"	D 35–25		data-sort-value="-63.3"	D 38–22
Pennsylvania	State Senate	data-sort-value="68.0"	R 34–16		data-sort-value="56.0"	R 28–21–1
Pennsylvania	House of Representatives	data-sort-value="59.6"	R 121–82		data-sort-value="54.2"	R 110–93
Rhode Island	Senate	data-sort-value="-86.8"	D 33–5		data-sort-value="-86.8"	D 33–5
Rhode Island	House of Representatives	data-sort-value="-85.3"	D 64–10–1		data-sort-value="-88.0"	D 66–9
South Carolina		House of Representatives	data-sort-value="64.5"	R 80–44		data-sort-value="64.5"	R 80–44
South Dakota	Senate	data-sort-value="82.9"	R 29–6		data-sort-value="85.7"	R 30–5
South Dakota	House of Representatives	data-sort-value="85.7"	R 60–10		data-sort-value="84.2"	R 59–11
Tennessee	Senate	data-sort-value="84.8"	R 28–5		data-sort-value="81.8"	R 27–5
Tennessee	House of Representatives	data-sort-value="74.7"	R 74–25		data-sort-value="73.7"	R 73–26
Texas	Senate	data-sort-value="64.5"	R 20–11		data-sort-value="61.3"	R 19–12
Texas	House of Representatives	data-sort-value="63.3"	R 95–55		data-sort-value="56.7"	R 83–67
Utah	State Senate	data-sort-value="82.8"	R 24–5		data-sort-value="79.3"	R 23–6
Utah	House of Representatives	data-sort-value="82.7"	R 62–13		data-sort-value="78.7"	R 59–16
Vermont	Senate	data-sort-value="-70.0"	D 21–7–2		data-sort-value="-73.3"	D 22–6–2
Vermont	House of Representatives	data-sort-value="-56.7"	D 85–53–7–7		data-sort-value="-63.3"	D 95–43–7–5
Washington	State Senate	data-sort-value="-53.1"	D 26–23		data-sort-value="-57.1"	D 28–21
Washington	House of Representatives	data-sort-value="-51.0"	D 50–48		data-sort-value="-58.2"	D 57–41
West Virginia	Senate	data-sort-value="64.7"	R 22–12		data-sort-value="58.8"	R 20–14
West Virginia	House of Delegates	data-sort-value="63.0"	R 63–37		data-sort-value="59.0"	R 59–41
Wisconsin	Senate	data-sort-value="60.6"	R 20–13		data-sort-value="57.5"	R 19–14
Wisconsin	State Assembly	data-sort-value="64.6"	R 64–35		data-sort-value="63.6"	R 63–34
Wyoming	Senate	data-sort-value="90.0"	R 27–3		data-sort-value="90.0"	R 27–3
Wyoming	House of Representatives	data-sort-value="86.7"	R 52–8		data-sort-value="83.3"	R 50–9–1

State summaries

Alabama

See main article: 2018 Alabama Senate election and 2018 Alabama House of Representatives election.

All members of the Alabama Senate and the Alabama House of Representatives were up for election in 2018. Republicans retained control of both chambers.

Party		Before	After	Change
+colspan=5	Alabama Senate
	Republican		26		27	1
	Independent		1	0	1
	Democratic	8	8
Total		35	35

Party		Before	After	Change
+colspan=5	Alabama House of Representatives
	Republican		72		77	5
	Democratic	33	28	5
Total		105	105

Alaska

See main article: 2018 Alaska Senate election and 2018 Alaska House of Representatives election.

Half of the seats of the Alaska Senate and all of the seats of the Alaska House of Representatives were up for election in 2018. Republicans retained control of the Senate, while a cross-partisan coalition of Democrats, Republicans, and independents retained control of the House of Representatives.^[8]

Party		Before	After	Change
+colspan=5	Alaska Senate
	Republican		14		13	1
	Democratic	6	7	1
Total		20	20

Party		Before	After
+colspan=5	Alaska House of Representatives
	Democratic		17	15	2
	Independent		2	2
	Republican		3	8	2
18	15				2
Total		40	40

Arizona

See main article: article and 2018 Arizona State Legislature election.

All of the seats of the Arizona Senate and the Arizona House of Representatives were up for election in 2018. Republicans retained control of both chambers, but lost four seats in the House and lost the popular vote in the Senate by 1.4 points.

Party		Before	After
+colspan=5	Arizona Senate
	Republican		17	17
	Democratic	13	13
Total		30	30

Party		Before	After	Change
+colspan=5	Arizona House of Representatives
	Republican		35		31	4
	Democratic	25	29	4
Total		60	60

Arkansas

Half of the seats of the Arkansas Senate and all of the seats of the Arkansas House of Representatives were up for election in 2018. Republicans retained control of both chambers.

Party		Before	After	Change
+colspan=5	Arkansas Senate
	Republican		28		29	1
	Democratic	7	6	1
Total		35	35

Party		Before	After	Change
+colspan=5	Arkansas House of Representatives
	Republican		77		82	5
	Democratic	23	18	5
Total		100	100

California

See main article: 2018 California State Senate election and 2018 California State Assembly election.

Half of the seats of the California State Senate and all of the seats of the California State Assembly were up for election in 2018. Democrats retained control of both chambers.

Party		Before	After	Change
+colspan=5	California State Senate
	Democratic		26		29	3
	Republican	14	11	3
Total		40	40

Party		Before	After	Change
+colspan=5	California State Assembly
	Democratic		55		60	5
	Republican	25	20	5
Total		80	80

Colorado

See main article: 2018 Colorado State Senate election and 2018 Colorado House of Representatives election.

Half of the seats of the Colorado Senate and all of the seats of the Colorado House of Representatives were up for election in 2018. Democrats won control of the Senate and retained control of the House of Representatives.

Party		Before	After	Change
+colspan=5	Colorado Senate
	Democratic	17		19	2
	Republican		18	16	2
Total		35	35

Party		Before	After	Change
+colspan=5	Colorado House of Representatives
	Democratic		37		42	5
	Republican	28	23	5
Total		65	65

Connecticut

See main article: 2018 Connecticut State Senate election and 2018 Connecticut House of Representatives election.

All of the seats of the Connecticut State Senate and the Connecticut House of Representatives were up for election in 2018. Democrats won control of the Senate, which was previously tied and retained control of the House of Representatives.

Party		Before	After	Change
+colspan=5	Connecticut State Senate
	Democratic	18		23	5
	Republican	18	13	5
Total		36	36

Party		Before	After	Change
+colspan=5	Connecticut House of Representatives
	Democratic		80		92	12
	Republican	71	59	12
Total		151	151

Delaware

See main article: 2018 Delaware State Senate election and 2018 Delaware House of Representatives election.

Half of the seats of the Delaware Senate and all of the seats of the Delaware House of Representatives were up for election in 2018. Democrats retained control of both chambers.

Party		Before	After	Change
+colspan=5	Delaware Senate
	Democratic		11		12	1
	Republican	10	9	1
Total		21	21

Party		Before	After	Change
+colspan=5	Delaware House of Representatives
	Democratic		25		26	1
	Republican	16	15	1
Total		41	41

Florida

See main article: 2018 Florida Senate election and 2018 Florida House of Representatives election.

Half of the seats of the Florida Senate and all of the seats of the Florida House of Representatives were up for election in 2018. Republicans retained control of both chambers.

Party		Before	After	Change
+colspan=5	Florida Senate
	Republican		24		23	1
	Democratic	16	17	1
Total		40	40

Party		Before	After	Change
+colspan=5	Florida House of Representatives
	Republican		78		73	5
	Democratic	42	47	5
Total		120	120

Georgia

See main article: 2018 Georgia State Senate election and 2018 Georgia House of Representatives election.

All of the seats of the Georgia State Senate and the Georgia House of Representatives were up for election in 2018. Republicans retained control of both chambers.

Party		Before	After	Change
+colspan=5	Georgia State Senate
	Republican		37		35	2
	Democratic	19	21	2
Total		56	56

Party		Before	After	Change
+colspan=5	Georgia House of Representatives
	Republican		116		105	11
	Democratic	64	75	11
Total		180	180

Hawaii

See main article: 2018 Hawaii Senate election and 2018 Hawaii House of Representatives election.

Half of the seats of the Hawaii Senate and all of the seats of the Hawaii House of Representatives were up for election in 2018. Democrats retained control of both chambers.

Party		Before	After	Change
+colspan=5	Hawaii Senate
	Democratic		25		24	1
	Republican	0	1	1
Total		25	25

Party		Before	After
+colspan=5	Hawaii House of Representatives
	Democratic		46	46
	Republican	5	5
Total		51	51

Idaho

All of the seats of the Idaho Senate and the Idaho House of Representatives were up for election in 2018. Republicans retained control of both chambers.

Party		Before	After	Change
+colspan=5	Idaho Senate
	Republican		29		28	1
	Democratic	6	7	1
Total		35	35

Party		Before	After	Change
+colspan=5	Idaho House of Representatives
	Republican		59		56	3
	Democratic	11	14	3
Total		70	70

Illinois

See main article: 2018 Illinois Senate election and 2018 Illinois House of Representatives election.

Two-thirds of the seats of the Illinois Senate and all of the seats of the Illinois House of Representatives were up for election in 2018. Democrats retained control of both chambers.

Party		Before	After	Change
+colspan=5	Illinois Senate
	Democratic		37		40	3
	Republican	22	19	3
Total		59	59

Party		Before	After	Change
+colspan=5	Illinois House of Representatives
	Democratic		67		74	7
	Republican	51	44	7
Total		118	118

Indiana

See main article: 2018 Indiana State Senate election.

Half of the seats of the Indiana Senate and all of the seats of the Indiana House of Representatives were up for election in 2018. Republicans retained control of both chambers.

Party		Before	After	Change
+colspan=5	Indiana Senate
	Republican		41		40	1
	Democratic	9	10	1
Total		50	50

Party		Before	After	Change
+colspan=5	Indiana House of Representatives
	Republican		70		67	3
	Democratic	30	33	3
Total		100	100

Iowa

See main article: 2018 Iowa Senate election and 2018 Iowa House of Representatives election.

Half of the seats of the Iowa Senate and all of the seats of the Iowa House of Representatives were up for election in 2018. Republicans retained control of both chambers.

Party		Before	After	Change
+colspan=5	Iowa Senate
	Republican		29		32	3
	Democratic	20	18	2
	Independent	1	0	1
Total		50	50

Party		Before	After	Change
+colspan=5	Iowa House of Representatives
	Republican		59		53	6
	Democratic	41	47	6
Total		100	100

Kansas

All of the seats of the Kansas House of Representatives were up for election in 2018; the Republican-controlled Kansas Senate did not hold regularly scheduled elections in 2018. Republicans retained control of the House of Representatives.

Party		Before	After
+colspan=5	Kansas House of Representatives
	Republican		85	85
	Democratic	40	40
Total		125	125

Kentucky

See main article: 2018 Kentucky Senate election and 2018 Kentucky House of Representatives election.

Half of the seats of the Kentucky Senate and all of the seats of the Kentucky House of Representatives were up for election in 2018. Republicans retained control of both chambers.

Party		Before	After	Change
+colspan=5	Kentucky Senate
	Republican		27		28	1
	Democratic	11	10	1
Total		38	38

Party		Before	After	Change
+colspan=5	Kentucky House of Representatives
	Republican		63		61	2
	Democratic	37	39	2
Total		100	100

Maine

See main article: 2018 Maine State Senate election and 2018 Maine House of Representatives election.

All of the seats of the Maine Senate and the Maine House of Representatives were up for election in 2018. Democrats gained control of the state senate and retained control of the House of Representatives.

Party		Before	After	Change
+colspan=5	Maine Senate
	Democratic	17		21	4
	Republican		18	14	4
Total		35	35

Party		Before	After	Change
+colspan=5	Maine House of Representatives
	Democratic		73		89	16
	Republican	70	57	13
	Independent	7	5	2
	Green	1	0	1
Total		151	151

Maryland

See main article: 2018 Maryland Senate election and 2018 Maryland House of Delegates election. All of the seats of the Maryland Senate and the Maryland House of Delegates were up for election in 2018. Democrats retained control of both chambers.

Party		Before	After	Change
+colspan=5	Maryland Senate
	Democratic		33		32	1
	Republican	14	15	1
Total		47	47

Party		Before	After	Change
+colspan=5	Maryland House of Delegates
	Democratic		92		99	7
	Republican	49	42	7
Total		141	141

Massachusetts

See main article: 2018 Massachusetts Senate election.

All of the seats of the Massachusetts Senate and the Massachusetts House of Representatives were up for election in 2018. Democrats control both chambers, and the governor is a member of the Republican Party. Democrats hold a veto-proof supermajority in the state legislature.^[9]

Party		Before	After	Change
+colspan=5	Massachusetts Senate
	Democratic		33		34	1
	Republican	7	6	1
Total		40	40

Party		Before	After	Change
+colspan=5	Massachusetts House of Representatives
	Democratic		125		127	2
	Republican	34	32	2
	Independent	1	1
Total		160	160

Michigan

See main article: 2018 Michigan Senate election and 2018 Michigan House of Representatives election.

All of the seats of the Michigan Senate and the Michigan House of Representatives were up for election in 2018. Republicans retained control of both chambers, but Democrats picked up enough seats to break the Republican legislative supermajority.^[10]

Party		Before	After	Change
+colspan=5	Michigan Senate
	Republican		27		22	5
	Democratic	11	16	5
Total		110	110

Party		Before	After	Change
+colspan=5	Michigan House of Representatives
	Republican		63		58	5
	Democratic	47	52	5
Total		110	110

Minnesota

See main article: 2018 Minnesota House of Representatives election.

All of the seats of the Minnesota House of Representatives were up for election in 2018; the Republican-controlled Minnesota Senate did not hold regularly scheduled elections in 2018. Democrats won control of the House of Representatives, making Minnesota the only state in the country where each major party controlled one state legislative chamber.^[1]

Party		Before	After	Change
+colspan=5	Minnesota House of Representatives
	Democratic (DFL)	57		75	18
	Republican		77	59	18
Total		134	134

Missouri

See main article: 2018 Missouri Senate election.

Half of the seats of the Missouri Senate and all of the seats of the Missouri House of Representatives were up for election in 2018. Republicans retained control of both chambers.

Party		Before	After
+colspan=5	Missouri Senate
	Republican		24	24
	Democratic	10	10
Total		34	34

Party		Before	After	Change
+colspan=5	Missouri House of Representatives
	Republican		117		116	1
	Democratic	46	47	1
Total		163	163

Montana

See main article: 2018 Montana House of Representatives election and 2018 Montana Senate election.

Half of the seats of the Montana Senate and all of the seats of the Montana House of Representatives were up for election in 2018. Republicans retained control of both chambers.

Party		Before	After	Change
+colspan=5	Montana Senate
	Republican		32		30	2
	Democratic	18	20	2
Total		50	50

Party		Before	After	Change
+colspan=5	Montana House of Representatives
	Republican		59		58	1
	Democratic	41	42	1
Total		100	100

Nebraska

See main article: 2018 Nebraska State Legislature election. Nebraska is the only U.S. state with a unicameral legislature; half of the seats of the Nebraska Legislature were up for election in 2018. Nebraska is also unique in that its legislature is officially non-partisan and holds non-partisan elections, although the Democratic and Republican parties each endorse legislative candidates. Republicans maintained control.

Party		Before	After	Change
+colspan=5	Nebraska Legislature
	Republican		31		30	1
	Democratic	16	18	2
	Independent	1	1
	Libertarian	1	0	1
Total		49	49

Nevada

See main article: 2018 Nevada State Senate election.

Half of the seats of the Nevada Senate and all of the seats of the Nevada Assembly were up for election in 2018. Democrats retained control of both chambers.

Party		Before	After	Change
+colspan=5	Nevada Senate
	Democratic		12		13	1
	Republican	9	8	1
Total		21	21

Party		Before	After	Change
+colspan=5	Nevada Assembly
	Democratic		27		29	2
	Republican	15	13	2
Total		42	42

New Hampshire

See main article: 2018 New Hampshire Senate election and 2018 New Hampshire House of Representatives election.

All of the seats of the New Hampshire Senate and the New Hampshire House of Representatives were up for election in 2018. Democrats won control of both chambers.

Party		Before	After	Change
+colspan=5	New Hampshire Senate
	Democratic	10		14	4
	Republican		14	10	4
Total		24	24

Party		Before	After	Change
+colspan=5	New Hampshire House of Representatives
	Democratic	173		234	61
	Republican		227	166	61
Total		400	400

New Mexico

See main article: 2018 New Mexico House of Representatives election.

All of the seats of the New Mexico House of Representatives were up for election in 2018; the Democratic-controlled New Mexico Senate did not hold regularly scheduled elections in 2018. Democrats retained control of the House of Representatives.

Party		Before	After	Change
+colspan=5	New Mexico House of Representatives
	Democratic		39		46	7
	Republican	31	24	7
Total		70	70

New York

See main article: 2018 New York State Senate election and 2018 New York State Assembly election.

All of the seats of the New York State Senate and the New York State Assembly were up for election in 2018. Democrats won control of the state senate and retained control of the state assembly.

Party		Before	After	Change
+colspan=5	New York State Senate
	Democratic	31		39	8
	1	1
	Republican		31	23	8
Total		63	63

Party		Before	After	Change
+colspan=5	New York State Assembly
	Democratic		107		106	1
	Republican	42	43	1
	Independence	1	1
Total		150	150

North Carolina

See main article: 2018 North Carolina Senate election and 2018 North Carolina House of Representatives election.

All of the seats of the North Carolina Senate and the North Carolina House of Representatives were up for election in 2018. Republicans retained control of both chambers, but Democrats won enough seats to break the Republican legislative super-majority.^[3]

Party		Before	After	Change
+colspan=5	North Carolina Senate
	Republican		35		29	6
	Democratic	15	21	6
Total		50	50

Party		Before	After	Change
+colspan=5	North Carolina House of Representatives
	Republican		75		65	10
	Democratic	45	55	10
Total		120	120

North Dakota

Half of the seats of the North Dakota Senate and the North Dakota House of Representatives were up for election in 2018. Republicans retained control of both chambers.

Party		Before	After	Change
+colspan=5	North Dakota Senate
	Republican		38		37	1
	Democratic-NPL	9	10	1
Total		47	47

Party		Before	After	Change
+colspan=5	North Dakota House of Representatives
	Republican		81		79	2
	Democratic-NPL	13	15	2
Total		94	94

Ohio

See main article: 2018 Ohio Senate election and 2018 Ohio House of Representatives election.

Half of the seats of the Ohio Senate and all of the seats of the Ohio House of Representatives were up for election in 2018. Republicans retained control of both chambers.

Party		Before	After
+colspan=5	Ohio Senate
	Republican		24	24
	Democratic	9	9
Total		33	33

Party		Before	After	Change
+colspan=5	Ohio House of Representatives
	Republican		66		58	5
	Democratic	32	38	5
Total		99	99

Oklahoma

Half of the seats of the Oklahoma Senate and all of the seats of the Oklahoma House of Representatives were up for election in 2018. Republicans retained control of both chambers.

Party		Before	After	Change
+colspan=5	Oklahoma Senate
	Republican		42		39	3
	Democratic	6	9	3
Total		48	48

Party		Before	After	Change
+colspan=5	Oklahoma House of Representatives
	Republican		75		77	2
	Democratic	26	24	2
Total		101	101

Oregon

See main article: 2018 Oregon legislative election.

Half of the seats of the Oregon State Senate and all of the seats of the Oregon House of Representatives were up for election in 2018. Democrats retained control of both chambers.

Party		Before	After	Change
+colspan=5	Oregon State Senate
	Democratic		17		18	1
	Republican	13	12	1
Total		30	30

Party		Before	After	Change
+colspan=5	Oregon House of Representatives
	Democratic		35		38	3
	Republican	25	22	3
Total		50	50

Pennsylvania

See main article: 2018 Pennsylvania Senate election and 2018 Pennsylvania House of Representatives election.

Half of the seats of the Pennsylvania State Senate and all of the seats of the Pennsylvania House of Representatives were up for election in 2018. Republicans retained control of both chambers, but Democrats picked up enough seats to break the Republican legislative supermajority.^[10]

Party		Before	After	Change
+colspan=5	Pennsylvania State Senate
	Republican		34		29	5
	Democratic	16	21	5
Total		50	50

Party		Before	After	Change
+colspan=5	Pennsylvania House of Representatives
	Republican		121		110	11
	Democratic	82	93	11
Total		203	203

Rhode Island

All of the seats of the Rhode Island Senate and the Rhode Island House of Representatives were up for election in 2018. Democrats retained control of both chambers.

Party		Before	After
+colspan=5	Rhode Island Senate
	Democratic		33	33
	Republican	5	5
Total		38	38

Party		Before	After	Change
+colspan=5	Rhode Island House of Representatives
	Democratic		64		66	2
	Republican	11	9	2
Total		75	75

South Carolina

See main article: 2018 South Carolina House of Representatives election.

All of the seats of the South Carolina House of Representatives were up for election in 2018; the Republican-controlled South Carolina Senate did not hold regularly scheduled elections in 2018. Republicans retained control of the House of Representatives.

Party		Before	After
+colspan=5	South Carolina House of Representatives
	Republican		80	80
	Democratic	44	44
Total		124	124

South Dakota

All of the seats of the South Dakota Senate and the South Dakota House of Representatives were up for election in 2018. Republicans retained control of both chambers.

Party		Before	After	Change
+colspan=5	South Dakota Senate
	Republican		29		30	1
	Democratic	6	5	1
Total		35	35

Party		Before	After	Change
+colspan=5	South Dakota House of Representatives
	Republican		60		59	1
	Democratic	10	11	1
Total		70	70

Tennessee

See main article: 2018 Tennessee State Senate election and 2018 Tennessee House of Representatives election.

Half of the seats of the Tennessee Senate and all of the seats of the Tennessee House of Representatives were up for election in 2018. Republicans retained control of both chambers.

Party		Before	After
+colspan=5	Tennessee Senate
	Republican		28	28
	Democratic	5	5
Total		33	33

Party		Before	After	Change
+colspan=5	Tennessee House of Representatives
	Republican		74		73	1
	Democratic	25	26	1
Total		99	99

Texas

See main article: 2018 Texas Senate election and 2018 Texas House of Representatives election.

Half of the seats of the Texas Senate and all of the seats of the Texas House of Representatives were up for election in 2018. Republicans retained control of both chambers.

Party		Before	After	Change
+colspan=5	Texas Senate
	Republican		21		19	2
	Democratic	10	12	2
Total		31	31

Party		Before	After	Change
+colspan=5	Texas House of Representatives
	Republican		95		83	12
	Democratic	55	67	12
Total		150	150

Utah

See main article: 2018 Utah Senate election and 2018 Utah House of Representatives election.

Half of the seats of the Utah State Senate and all of the seats of the Utah House of Representatives were up for election in 2018. Republicans retained control of both chambers.

Party		Before	After	Change
+colspan=5	Utah State Senate
	Republican		24		23	1
	Democratic	5	6	1
Total		29	29

Party		Before	After	Change
+colspan=5	Utah House of Representatives
	Republican		62		59	3
	Democratic	13	16	3
Total		75	75

Vermont

See main article: 2018 Vermont Senate election and 2018 Vermont House of Representatives election.

All of the seats of the Vermont Senate and the Vermont House of Representatives were up for election in 2018. Democrats retained control of both chambers.

Party		Before	After	Change
+colspan=5	Vermont Senate
	Democratic		21		22	1
	Republican	7	6	1
	Progressive	2	2
Total		30	30

Party		Before	After	Change
+colspan=5	Vermont House of Representatives
	Democratic		83		95	12
	Republican	53	43	10
	Progressive	7	7
	Independent	7	5	2
Total		150	150

Washington

See main article: 2018 Washington State Senate election and 2018 Washington House of Representatives election.

Half of the seats of the Washington State Senate and all of the seats of the Washington House of Representatives were up for election in 2018. Democrats had previously flipped control of the Senate in a 2017 special election.^[11] Democrats retained control of both chambers.

Party		Before	After	Change
+colspan=5	Washington State Senate
	Democratic		25		28	3
1	1	3
	Republican	3	23	20
Total		49	49

Party		Before	After	Change
+colspan=5	Washington House of Representatives
	Democratic		50		57	7
	Republican	48	41	7
Total		98	98

West Virginia

See main article: 2018 West Virginia Senate election and 2018 West Virginia House of Delegates election.

Half of the seats of the West Virginia Senate and all of the seats of the West Virginia House of Delegates were up for election in 2018. Republicans retained control of both chambers.

Party		Before	After	Change
+colspan=5	West Virginia Senate
	Republican		22		20	2
	Democratic	12	14	2
Total		34	34

Party		Before	After	Change
+colspan=5	West Virginia House of Delegates
	Republican		64		57	7
	Democratic	36	43	7
Total		100	100

Wisconsin

See main article: 2018 Wisconsin State Senate election and 2018 Wisconsin State Assembly election.

Half of the seats of the Wisconsin State Senate and all of the seats of the Wisconsin State Assembly were up for election in 2018. Republicans retained control of both chambers.

Party		Before	After	Change
+colspan=5	Wisconsin Senate
	Republican		18		19	1
	Democratic	15	14	1
Total		33	33

Party		Before	After	Change
+colspan=5	Wisconsin State Assembly
	Republican		64		63	1
	Democratic	35	36	1
Total		99	99

Wyoming

See main article: 2018 Wyoming State Senate election and 2018 Wyoming House of Representatives election.

Half of the seats of the Wyoming Senate and all of the seats of the Wyoming House of Representatives were up for election in 2018. Republicans retained control of both chambers.

Party		Before	After
+colspan=5	Wyoming Senate
	Republican		27	27
	Democratic	3	3
Total		30	30

Party		Before	After	Change
+colspan=5	Wyoming House of Representatives
	Republican		51		50	1
	Democratic	9	9
	Independent	0	1	1
Total		60	60

Territorial and federal district summaries

American Samoa

All of the seats of the American Samoa House of Representatives were up for election. Members of the House of Representatives serve two-year terms. Gubernatorial and legislative elections are conducted on a nonpartisan basis in American Samoa.

Guam

All of the seats of the unicameral Legislature of Guam were up for election. All members of the legislature serve a two-year term. Democrats retained control of the legislature.

Party		Before	After	Change
+colspan=5	Guam Legislature
	Democratic		9		10	1
	Republican	6	5	1
Total		15	15

Northern Mariana Islands

A portion of the seats of the Northern Mariana Islands Senate, and all of the seats of the Northern Mariana Islands House of Representatives, were up for election. Members of the senate serve either four-year terms, while members of the house serve two-year terms. Republicans maintained control of both chambers.

Party		Before	After	Change
+colspan=5	Northern Mariana Islands Senate^[12]
	Republican		7		6	1
	Independent	2	3	1
	Democratic	0	0
Total		9	9

Party		Before	After	Change
+colspan=5	Northern Mariana Islands House of Representatives^[13]
	Republican		15		13	2
	Democratic	0	0
		5	7	2
Total		20	20

U.S. Virgin Islands

All of the seats of the unicameral Legislature of the Virgin Islands were up for election. All members of the legislature serve a two-year term. Democrats retained control of the legislature.

Party		Before	After	Change
+colspan=5	Virgin Islands Legislature
	Democratic		11		13	2
	Independent	4	2	2
Total		15	15

Washington, D.C.

The Council of the District of Columbia serves as the legislative branch of the federal district of Washington, D.C. Half of the council seats are up for election. Council members serve four-year terms. Democrats retained supermajority control of the council.

Party		Before	After
+colspan=5	District of Columbia Council
	Democratic		11	11
	Independent	2	2
Total		13	13

Special elections

Various states will hold special elections for legislative districts throughout the year.^[14]

Alabama

District		Incumbent			This race
Chamber	No.	Representative	Party	First elected	Results	Candidates
House	21	Jim Patterson		Republican	2010		Incumbent died October 2, 2017, of heart attack. New member elected March 27, 2018. Republican hold.	nowrap	*Rex Reynolds (Republican) 52.8%* C. Terry Jones (Democratic) 47.1%
House	4	Micky Hammon		Republican	2002		Incumbent resigned September 11, 2017. New member elected May 15, 2018. Republican hold.	nowrap	*Parker Moore (Republican) 65.0%* Jo Ann Cummings (Democratic) 25.4% Pete Wills (Independent) 9.5%
Senate	26	Quinton T. Ross, Jr.		Democratic	2002		Incumbent resigned October 2, 2017, to become the president of Alabama State University New member elected May 15, 2018. Democratic hold.	nowrap	David Burkette (Democratic) 89.3% D.J. Johnson(Republican) 10.4%

New Jersey

District		Incumbent			This race
Chamber	No.	Representative	Party	First elected	Results	Candidates^[15] ^[16]
Senate	38	Robert M. Gordon		Democratic	2007		Incumbent resigned April 4, 2018, to join the New Jersey Board of Public Utilities.^[17] New member elected November 6, 2018. Democratic hold.	nowrap	Joseph Lagana (Democratic) 60.1% Daisy Ortiz Berger (Republican) 39.9%
Assembly	5	Arthur Barclay		Democratic	2015		Incumbent resigned June 18, 2018, following arrest for assault.^[18] New member elected November 6, 2018. Democratic hold.	nowrap	William Spearman (Democratic) 66.3% Nicholas Kush (Republican) 33.7%
Assembly	15	Elizabeth Maher Muoio		Democratic	2015		Incumbent resigned January 15, 2018, to become State Treasurer of New Jersey.^[19] New member elected November 6, 2018. Democratic hold.	nowrap	Verlina Reynolds-Jackson (Democratic) 72.0% Tracy R. Sinatra (Republican) 26.4% Ed Forchion (Repeal Bail Reform) 1.6%
Assembly	15	Reed Gusciora		Democratic	1995		Incumbent resigned June 30, 2018, to become Mayor of Trenton.^[20] New member elected November 6, 2018. Democratic hold.	nowrap	Anthony Verrelli (Democratic) 71.5% Justin Tibbetts (Republican) 25.5% Alex Bethea (Integrity Transparency Accountability) 3.0%
Assembly	22	Jerry Green		Democratic	1991		Incumbent died April 18, 2018, from a long illness.^[21] New member elected November 6, 2018. Democratic hold.	nowrap	Linda S. Carter (Democratic) 69.4% John Quattrocchi (Republican) 30.6%
Assembly	32	Vincent Prieto		Democratic	2004		Incumbent resigned February 26, 2018, to become President and CEO of the New Jersey Sports and Exposition Authority.^[22] New member elected November 6, 2018. Democratic hold.	nowrap	Pedro Mejia (Democratic) 100.0%
Assembly	34	Sheila Oliver		Democratic	2003		Incumbent resigned January 9, 2018, to become Lieutenant Governor of New Jersey.^[23] New member elected November 6, 2018. Democratic hold.	nowrap	Britnee Timberlake (Democratic) 81.9% Irene DeVita (Republican) 16.6% Clenard Howard Childress Jr. (Stop the Insanity) 1.5%
Assembly	36	Marlene Caride		Democratic	2011		Incumbent resigned January 16, 2018, to become Commissioner of the New Jersey Department of Banking and Insurance.^[24] New member elected November 6, 2018. Democratic hold.	nowrap	Clinton Calabrese (Democratic) 63.8% Marc Marsi (Republican) 36.2%
Assembly	38	Joseph Lagana		Democratic	2013		Incumbent resigned April 12, 2018, to join the State Senate.^[25] New member elected November 6, 2018. Democratic hold.	nowrap	Lisa Swain (Democratic) 59.7% Gail Horton (Republican) 40.3%
Assembly	38	Tim Eustace		Democratic	2011		Incumbent resigned April 13, 2018, to become Deputy Director of the North Jersey District Water Supply Commission.^[26] New member elected November 6, 2018. Democratic hold.	nowrap	Chris Tully (Democratic) 59.3% Jayme Ouellette (Republican) 40.7%

Notes and References

News: Quinton . Sophie . Povich . Elaine S. . So Much Changed in Statehouses This Week. Here's What It All Means. . Stateline. The Pew Charitable Trusts. November 9, 2018.
http://www.ncsl.org/research/elections-and-campaigns/statevote-2018-state-legislative-races-and-ballot-measures.aspx NCSL State Vote
Jim Morrill & Paul A. Specht, Blue waves in urban North Carolina help Democrats break GOP 'supermajorities', Charlotte Observer (November 7, 2018).
Connor Radnovich, Oregon Democrats secure supermajorities in both chambers of Oregon Legislature, Salem Statesman Journal (November 7, 2018).
News: Wildermuth . John . Nearly a Week After Election Day, California Democrats Regain Supermajority in Legislature . November 13, 2018 . Governing . November 13, 2018.
Web site: 2018 Legislative Races by State and Legislative Chamber . National Conference of State Legislatures.
Web site: Jacobson . Louis . 2018-10-08 . A Month Before Election Day, Democrats Poised for Legislative Gains . 2024-06-27 . Governing . en.
News: Wilson . Reid . Alaska House elects a Speaker after more than a month of gridlock . The Hill . February 15, 2019.
News: Young . Colin A. . Lannan . Katie . Democrats Further Solidify Super-Majorities In The Mass. House And Senate . WBUR News . November 7, 2018.
News: Rogers . Steven . The blue wave was big—and significant—in state legislatures . November 12, 2018 . Washington Post . November 12, 2018.
News: May . Patrick . November 8, 2017 . On election night, Democratic voters erect 'big blue wall' on the West Coast . live . https://web.archive.org/web/20171109001018/http://www.mercurynews.com/2017/11/08/on-election-night-democratic-voters-erect-big-blue-wall-on-the-west-coast/ . November 9, 2017 . November 9, 2017 . The Mercury News.
Web site: Northern Mariana Islands Senate . Ballotpedia . November 4, 2020 . January 12, 2021 .
Web site: Northern Mariana Islands House of Representatives . Ballotpedia . November 4, 2020 . January 12, 2021 .
Web site: State legislative special elections, 2021 . Ballotpedia .
Web site: Official List, Candidates for State Senate For GENERAL ELECTION 11/06/2018 Election . . July 31, 2022 . December 3, 2018.
Web site: Official List, Candidates for General Assembly For GENERAL ELECTION 11/06/2018 Election . . July 31, 2022 . December 3, 2018.
Web site: Tate. Curtis. Gov. Phil Murphy appoints Sen. Bob Gordon to NJ utility watchdog. NorthJersey.com. April 14, 2018. April 5, 2018.
Web site: Trethan . Phaedra . Assemblyman Arthur Barclay resigns after arrest for simple assault . . June 18, 2018 . June 18, 2018.
Curran, Phillip Sean. "Assemblywoman Muoio resigns, creating vacancy in legislature", CentralJersey.com, January 17, 2018.
News: Mercer Freeholder Verrelli wins appointment to Gusciora's vacant Assembly seat . July 26, 2018 . Sulaiman . Abdur-Rahman . The Trentonian . August 12, 2018.
Web site: Pizarro. Max. Rest in Peace, Assemblyman and Union County Democratic Chairman Jerry Green of Plainfield. Insider NJ. April 21, 2018. April 19, 2018.
Web site: Johnson. Brent. Ex-Assembly speaker Prieto lands $280K job as head of N.J. sports authority. NJ.com. March 25, 2018. February 15, 2018.
Web site: O'Dea. Colleen. Who's Who, Who's New, And Who's Blue In 218th Legislative Session. NJ Spotlight. January 13, 2018. January 10, 2018.
Web site: Blosfield . Elizabeth . Caride Named Acting Commissioner of N.J. Department of Banking and Insurance . Insurance Journal . June 18, 2018 . February 14, 2018.
Web site: Van Vliet. John. Assemblyman Joseph Lagana to Succeed Senator Bob Gordon in the 38th District. TAPinto. April 14, 2018. April 4, 2018.
Web site: Kanzler. Kaitlyn. Tim Eustace to become deputy director of North Jersey District Water Supply Commission. NorthJersey.com. April 14, 2018. April 12, 2018.