# 2018 United States state legislative elections

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 made significant ground in state legislative races, flipping six chambers from the Republicans and winning control of one tied chamber.

## 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 | Upper House | Upper House | Upper House | Lower House | Lower House | Lower House | 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) | N/A (unicameral) | N/A (unicameral) | 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.
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 | PVI | Chamber | Last election | Governing Oct. 8, 2018 | Result |
| Alabama | R+14 | Senate | R 27–8 | Safe R | R 27–8 |
| Alabama | R+14 | House of Representatives | R 72–33 | Safe R | R 77–28 |
| Alaska | R+9 | Senate | R 14–6 | Safe R | R 13–7 |
| Alaska | R+9 | House of Representatives | Coal. 22–18 | Tossup | Coal. 23–15–2 |
| Arizona | R+5 | Senate | R 17–13 | Lean R | R 17–13 |
| Arizona | R+5 | House of Representatives | R 35–25 | Likely R | R 31–29 |
| Arkansas | R+15 | Senate | R 26–9 | Safe R | R 26–9 |
| Arkansas | R+15 | House of Representatives | R 73–27 | Safe R | R 76–24 |
| California | D+12 | State Senate | D 27–13 | Safe D | D 29–11 |
| California | D+12 | State Assembly | D 55–25 | Safe D | D 61–18–1 |
| Colorado | D+1 | Senate | R 18–17 | Tossup | D 19–16 |
| Colorado | D+1 | House of Representatives | D 37–28 | Likely D | D 41–24 |
| Connecticut | D+6 | State Senate | 18–18 | Tossup | D 22–14 |
| Connecticut | D+6 | House of Representatives | D 80–71 | Lean D | D 97–54 |
| Delaware | D+6 | Senate | D 11–10 | Lean D | D 12–9 |
| Delaware | D+6 | House of Representatives | D 25–16 | Safe D | D 26–15 |
| Florida | R+2 | Senate | R 25–15 | Lean R | R 23–17 |
| Florida | R+2 | House of Representatives | R 79–41 | Likely R | R 73–47 |
| Georgia | R+5 | State Senate | R 38–18 | Likely R | R 35–21 |
| Georgia | R+5 | House of Representatives | R 118–62 | Likely R | R 105–75 |
| Hawaii | D+18 | Senate | D 25–0 | Safe D | D 24–1 |
| Hawaii | D+18 | House of Representatives | D 45–6 | Safe D | D 46–5 |
| Idaho | R+19 | Senate | R 29–6 | Safe R | R 28–7 |
| Idaho | R+19 | House of Representatives | R 59–11 | Safe R | R 56–14 |
| Illinois | D+7 | Senate | D 37–22 | Safe D | D 40–19 |
| Illinois | D+7 | House of Representatives | D 67–51 | Safe D | D 74–44 |
| Indiana | R+9 | Senate | R 41–9 | Safe R | R 40–10 |
| Indiana | R+9 | House of Representatives | R 70–30 | Likely R | R 67–33 |
| Iowa | R+3 | Senate | R 29–20–1 | Safe R | R 32–18 |
| Iowa | R+3 | House of Representatives | R 59–41 | Lean R | R 53–47 |
| Kansas | R+13 | House of Representatives | R 85–40 | Safe R | R 84–41 |
| Kentucky | R+15 | Senate | R 27–11 | Safe R | R 28–10 |
| Kentucky | R+15 | House of Representatives | R 64–36 | Safe R | R 61–39 |
| Maine | D+3 | Senate | R 18–17 | Tossup | D 21–14 |
| Maine | D+3 | House of Representatives | D 77–72–2 | Lean D | D 89–56–6 |
| Maryland | D+12 | Senate | D 33–14 | Safe D | D 32–15 |
| Maryland | D+12 | House of Representatives | D 92–49 | Safe D | D 99–42 |
| Massachusetts | D+12 | Senate | D 34–6 | Safe D | D 34–6 |
| Massachusetts | D+12 | House of Representatives | D 125–35 | Safe D | D 127–32–1 |
| Michigan | D+1 | Senate | R 27–11 | Likely R | R 22–16 |
| Michigan | D+1 | House of Representatives | R 63–47 | Lean R | R 58–52 |
| Minnesota | D+1 | House of Representatives | R 77–57 | Lean R | D 75–59 |
| Missouri | R+9 | Senate | R 25–9 | Likely R | R 23–10 |
| Missouri | R+9 | House of Representatives | R 117–46 | Likely R | R 116–47 |
| Montana | R+11 | Senate | R 32–18 | Safe R | R 30–20 |
| Montana | R+11 | House of Representatives | R 59–41 | Safe R | R 58–42 |
| Nevada | D+1 | Senate | D 11–10 | Likely D | D 13–8 |
| Nevada | D+1 | Assembly | D 27–15 | Likely D | D 29–13 |
| New Hampshire | D+1 | Senate | R 14–10 | Lean D (flip) | D 14–10 |
| New Hampshire | D+1 | House of Representatives | R 227–173 | Lean D (flip) | D 234–166 |
| New Mexico | D+3 | House of Representatives | D 38–32 | Safe D | D 46–24 |
| New York | D+11 | State Senate | Coal. 39–24 | Lean D (flip) | D 40–23 |
| New York | D+11 | State Assembly | D 106–43–1 | Safe D | D 105–44–1 |
| North Carolina | R+3 | Senate | R 35–15 | Likely R | R 29–21 |
| North Carolina | R+3 | House of Representatives | R 74–46 | Likely R | R 65–55 |
| North Dakota | R+16 | Senate | R 38–9 | Safe R | R 37–10 |
| North Dakota | R+16 | House of Representatives | R 81–13 | Safe R | R 79–15 |
| Ohio | R+3 | Senate | R 24–9 | Safe R | R 24–9 |
| Ohio | R+3 | House of Representatives | R 66–33 | Likely R | R 61–38 |
| Oklahoma | R+20 | Senate | R 42–6 | Safe R | R 38–9 |
| Oklahoma | R+20 | House of Representatives | R 75–26 | Likely R | R 77–23 |
| Oregon | D+5 | State Senate | D 17–13 | Safe D | D 18–12 |
| Oregon | D+5 | House of Representatives | D 35–25 | Safe D | D 38–22 |
| Pennsylvania | EVEN | State Senate | R 34–16 | Likely R | R 28–21–1 |
| Pennsylvania | EVEN | House of Representatives | R 121–82 | Likely R | R 110–93 |
| Rhode Island | D+10 | Senate | D 33–5 | Safe D | D 33–5 |
| Rhode Island | D+10 | House of Representatives | D 64–10–1 | Safe D | D 66–9 |
| South Carolina | R+8 | House of Representatives | R 80–44 | Safe R | R 80–44 |
| South Dakota | R+14 | Senate | R 29–6 | Safe R | R 30–5 |
| South Dakota | R+14 | House of Representatives | R 60–10 | Safe R | R 59–11 |
| Tennessee | R+14 | Senate | R 28–5 | Safe R | R 27–5 |
| Tennessee | R+14 | House of Representatives | R 74–25 | Safe R | R 73–26 |
| Texas | R+8 | Senate | R 20–11 | Safe R | R 19–12 |
| Texas | R+8 | House of Representatives | R 95–55 | Likely R | R 83–67 |
| Utah | R+20 | State Senate | R 24–5 | Safe R | R 23–6 |
| Utah | R+20 | House of Representatives | R 62–13 | Safe R | R 59–16 |
| Vermont | D+15 | Senate | D 21–7–2 | Safe D | D 22–6–2 |
| Vermont | D+15 | House of Representatives | D 85–53–7–7 | Safe D | D 95–43–7–5 |
| Washington | D+7 | State Senate | D 26–23 | Likely D | D 28–21 |
| Washington | D+7 | House of Representatives | D 50–48 | Likely D | D 57–41 |
| West Virginia | R+19 | Senate | R 22–12 | Likely R | R 20–14 |
| West Virginia | R+19 | House of Delegates | R 63–37 | Safe R | R 59–41 |
| Wisconsin | EVEN | Senate | R 20–13 | Tossup | R 19–14 |
| Wisconsin | EVEN | State Assembly | R 64–35 | Likely R | R 63–34 |
| Wyoming | R+25 | Senate | R 27–3 | Safe R | R 27–3 |
| Wyoming | R+25 | House of Representatives | R 52–8 | Safe R | R 50–9–1 |

## National results

Lower house results by party :
| Party | Party | Seats before | Chambers before | Seats after | +/- | Chambers after | +/- |
| | Republican | 3034 | 31 | 2792 | 242 | 29 | 2 |
| | Democratic | 2348 | 17 | 2594 | 246 | 19 | 2 |
| | Independent | 20 | 0 | 17 | 3 | 0 | |
| | Progressive | 7 | 0 | 7 | | 0 | |
| | Independence | 1 | 0 | 1 | | 0 | |
| | Green | 1 | 0 | 0 | 1 | 0 | |
| Total | Total | 5411 | 49 | 5411 | — | 49 | — |
Upper house results by party :
| Party | Party | Seats before | Chambers before | Seats after | +/- | Chambers after | +/- |
| | Republican | 1153 | 36 | 1091 | 62 | 32 | 4 |
| | Democratic | 811 | 13 | 877 | 66 | 18 | 5 |
| | Independent | 5 | 0 | 2 | 3 | 0 | |
| | Progressive | 2 | 0 | 2 | | 0 | |
| | Libertarian | 1 | 0 | 0 | 1 | 0 | |
| Total | Total | 1972 | 50 | 1972 | — | 50 | — |
Democrats flipped over 350 state legislative seats from the Republicans, with Republican flips offsetting their to total net gain to just over 300 seats. Democrats picked 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. Additionally the Connecticut Senate went from being evenly divided to a Democratic majority. Democrats also broke Republican legislative supermajorities in North Carolina, Michigan, and Pennsylvania, and they gained a legislative supermajority in both houses of the California, Illinois, and Oregon legislatures.

## Maps

* Partisan control of states in the 2018 elections Democrats retained trifecta Democrats gained trifecta Republicans retained trifecta Republicans gained trifecta Divided government maintained Divided government established Officially non-partisan legislature
* Upper house seats by party holding majority in each state Republican 50–60% 60–70% 70–80% 80–90% 90–100% Democratic 50–60% 60–70% 70–80% 80–90% 90–100%
* Lower house seats by party holding majority in each state Republican 50–60% 60–70% 70–80% 80–90% Democratic 50–60% 60–70% 70–80% 80–90% 90–100%
* Net changes to upper house seats after the 2018 elections +1 Dem seat +2 Dem seats +3–5 Dem seats +6–8 Dem seats +1 Rep seat +3 Rep seats
* Net changes to lower house seats after the 2018 elections +1 Dem seat +2 Dem seats +3–5 Dem seats +6–61 Dem seats +1 Rep seat +2 Rep seats +5 Rep seats +1 Ind seat

## State summaries
### Alabama

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

### Alaska

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.

### Arizona

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.

### 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.

### California

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.

### Colorado

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.

### Connecticut

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.

### Delaware

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.

### Florida

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.

### Georgia

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.

### Hawaii

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.

### 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.

### Illinois

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.

### Indiana

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.

### Iowa

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.

### 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.

### Kentucky

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.

### Maine

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.

### Maryland

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.

### Massachusetts

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.

### Michigan

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.

### Minnesota

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.

### Missouri

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.

### Montana

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.

### Nebraska

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.

### Nevada

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.

### New Hampshire

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.

### New Mexico

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.

### New York

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.

### North Carolina

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.

### 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.

### Ohio

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.

### 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.

### Oregon

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.

### Pennsylvania

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.

### 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.

### South Carolina

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.

### 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.

### Tennessee

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.

### Texas

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.

### Utah

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.

### Vermont

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.

### Washington

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. Democrats retained control of both chambers.

### West Virginia

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.

### Wisconsin

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.

### Wyoming

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.

## 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.

### 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.

### 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.

### 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.

## Special elections

Various states will hold special elections for legislative districts throughout the year.

### Alabama

| District | District | Incumbent | Incumbent | Incumbent | This race | 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. | ▌ Y 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. | ▌ Y 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. | ▌ Y David Burkette (Democratic) 89.3% ▌ D.J. Johnson(Republican) 10.4% |

### New Jersey

| District | District | Incumbent | Incumbent | Incumbent | This race | This race |
| Chamber | No. | Representative | Party | First elected | Results | Candidates |
| Senate | 38 | Robert M. Gordon | Democratic | 2007 | Incumbent resigned April 4, 2018, to join the New Jersey Board of Public Utilities. New member elected November 6, 2018. Democratic hold. | ▌ Y 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. New member elected November 6, 2018. Democratic hold. | ▌ Y William Spearman (Democratic) 66.3% ▌ Nicholas Kush (Republican) 33.7% |
| Assembly | 15 | Elizabeth Maher Muoio | Democratic | 2015 (appointed) | Incumbent resigned January 15, 2018, to become State Treasurer of New Jersey. New member elected November 6, 2018. Democratic hold. | ▌ Y 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. New member elected November 6, 2018. Democratic hold. | ▌ Y 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. New member elected November 6, 2018. Democratic hold. | ▌ Y Linda S. Carter (Democratic) 69.4% ▌ John Quattrocchi (Republican) 30.6% |
| Assembly | 32 | Vincent Prieto | Democratic | 2004 (appointed) | Incumbent resigned February 26, 2018, to become President and CEO of the New Jersey Sports and Exposition Authority. New member elected November 6, 2018. Democratic hold. | ▌ Y Pedro Mejia (Democratic) 100.0% |
| Assembly | 34 | Sheila Oliver | Democratic | 2003 | Incumbent resigned January 9, 2018, to become Lieutenant Governor of New Jersey. New member elected November 6, 2018. Democratic hold. | ▌ Y 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. New member elected November 6, 2018. Democratic hold. | ▌ Y 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. New member elected November 6, 2018. Democratic hold. | ▌ Y 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. New member elected November 6, 2018. Democratic hold. | ▌ Y Chris Tully (Democratic) 59.3% ▌ Jayme Ouellette (Republican) 40.7% |