An at-large congressional district is a district that covers an entire state and is represented by a single member of the U.S. House. In an at-large seat there are no internal district lines, because the whole state is the district. This guide explains which states have one, how at-large representation works, and why it exists. You can also look up your own congressional district by address or ZIP code at any time.
How an at-large seat works
Most states are divided into multiple congressional districts, each electing one representative. A state with an at-large district has only one House seat, so every voter in the state votes for the same representative in a single statewide election. That member represents the entire state in the House, the same way a senator does, while still serving a two-year House term.
Which states have an at-large district
Six states currently have a single at-large congressional district because their populations entitle them to just one House seat:
Washington, D.C., and the U.S. territories also send members to the House, but those are non-voting delegates rather than voting representatives, so they are counted separately from the 435 voting seats.
Why some states have only one seat
The number of House seats a state receives is set by reapportionment, the process of dividing the 435 seats among the states after each census based on population. Every state is guaranteed at least one seat no matter how small its population, so the least populous states end up with a single at-large district. As populations shift, a state can move between having one at-large seat and having multiple districts. You can read more about how many congressional districts there are and what a congressional district is.
At-large districts in history
At-large seats were once more common, and some states with several House members elected all of them statewide rather than by district. That changed in 1967, when federal law required states with more than one representative to elect them from single-member districts. Today an at-large seat only appears in a state entitled to exactly one representative.
What this means for voters
Why larger states cannot use at-large seats
A state with more than one House seat cannot elect those members statewide. A 1967 federal law requires that representatives be chosen from single-member districts, each electing one person. Before that law, a few states did elect some or all of their House members at-large, which let a single statewide majority win every seat. Congress ended the practice to protect local and minority representation. The result is the system in place today: only states entitled to a single seat use an at-large district, and every multi-seat state must divide into separate districts.
How an at-large House seat compares to a Senate seat
An at-large representative and a U.S. senator both run statewide, so the same voters choose both. The jobs are not the same. A representative serves a two-year term and sits in the House, where seats are tied to population. A senator serves a six-year term in the Senate, where every state has two seats regardless of size. A single-district state therefore sends one at-large representative and two senators to Washington, three members of Congress in total, plus three electoral votes in presidential elections.
When a state gains or loses its second seat
A state can move from one at-large seat to several districts when it grows. Montana did this after the 2020 census, returning to two districts for the first time since the early 1990s after years with a single at-large seat. When that happens, the state must draw district lines for the first time in decades, and voters who once shared one statewide representative are sorted into separate districts. The reverse can also occur. A state that loses population can drop to a single at-large seat, as several small states have over the last century.
What an at-large seat means on your ballot
If you live in a single-district state, your ballot lists one U.S. House race, and every voter in the state sees the same one. There is no district number to look up, because the whole state is the district. You still vote separately for your two U.S. senators, who also run statewide but serve different terms. When you check your district on a lookup tool, a single-district state simply returns the state’s at-large seat, since there are no internal lines to place you within.
If you live in an at-large state, your representative is the same as everyone else’s in the state, and redistricting does not redraw your boundaries because there are none to redraw. Reapportionment can still change your status if your state grows enough to earn a second seat. To see your current member and the next election, enter your address or ZIP on our home page or browse all 435 congressional districts.
Last updated August 3, 2026.
