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Congress Basics

Guide to Congressional Elections (House & Senate)

Congressional elections determine who represents you in the U.S. House of Representatives and Senate. Understanding the election cycle, including when elections occur and which seats are on the ballot, helps you stay informed and engaged as a voter.

Quick Answer

House: All 435 seats up for election every 2 years
Senate: About one-third (33–34 seats) up every 2 years, on staggered 6-year terms
Election Day: First Tuesday after the first Monday in November of even-numbered years
New Congress: Convenes at noon on January 3 of the following year

House Elections: Every 2 Years

All 435 House seats are up for election every two years. House elections occur in:

Presidential election years (2024, 2028, 2032...) - Higher turnout due to presidential race
Midterm election years (2026, 2030, 2034...) - Lower turnout, often seen as referendum on sitting president

This 2-year cycle keeps House members closely accountable to voters. Representatives must campaign frequently, making the House the most responsive chamber to current public opinion.

Senate Elections: Staggered 6-Year Terms

Senators serve 6-year terms, but only about one-third of the Senate (33-34 seats) is elected every two years. The Senate is divided into three classes:

Class I - Last elected in 2024, next election in 2030
Class II - Last elected in 2020, next election in 2026
Class III - Last elected in 2022, next election in 2028

This staggered system ensures the Senate always has experienced members, providing stability and institutional knowledge. Learn more about how Senate classes work.

Election Day: When and Why

Federal elections are held on the first Tuesday after the first Monday in November in even-numbered years. This tradition dates back to 1845 and was chosen because:

November followed the harvest season, allowing farmers to vote
Tuesday avoided conflicts with Sunday worship and Wednesday market days
The formula ensures Election Day falls between November 2 and 8

Upcoming election dates:

2026: November 3
2028: November 7
2030: November 5

Primary Elections vs. General Elections

Primary Elections

Primary elections determine which candidates from each political party will appear on the general election ballot. Primary dates vary by state, typically occurring between March and September of an election year.

Some states have "closed primaries" (only registered party members can vote), while others have "open primaries" (any registered voter can participate).

General Elections

The general election in November is when voters choose between the candidates who won their party primaries. This is when House members and senators are officially elected to office.

Special Elections

When a House or Senate seat becomes vacant due to death, resignation, or other reasons, a special election may be held to fill the remainder of the term. Special election rules vary by state:

House vacancies: Most states hold special elections within a few months
Senate vacancies: Some states allow the governor to appoint a temporary replacement until the next general election

The Election Timeline

A typical congressional election cycle follows this pattern:

Voter Eligibility and Registration

To vote in congressional elections, you must:

Be a U.S. citizen
Be 18 years or older on Election Day
Meet your state's residency requirements
Be registered to vote (registration deadlines vary by state)

Check your voter registration status and find your polling place at Vote.gov.

Track Your Representatives

Want to see when your current representatives' terms end? Use our interactive map to explore your congressional delegation and upcoming elections.

Frequently Asked Questions

How often are congressional elections?

Congressional elections occur every 2 years in even-numbered years. All 435 House seats are on the ballot every election. For the Senate, approximately one-third (33-34 seats) are elected every 2 years due to staggered 6-year terms.

How often are House elections?

House elections occur every 2 years. All 435 House seats are up for election every two years, in both presidential election years (2024, 2028) and midterm years (2026, 2030). House members serve 2-year terms.

When is the next congressional election?

The next congressional election is on November 3, 2026 (midterm election). All 435 House seats and 33 Senate seats (Class II) will be on the ballot. Early voting and mail-in ballot timelines vary by state.

What is the difference between primary and general elections?

Primary elections (held spring/summer) determine which candidate from each political party advances to the general election. General elections (held in November) are when voters choose between the primary winners to elect representatives and senators to Congress.

When does a newly elected Congress start?

A newly elected Congress convenes at noon on January 3 of the year following the November election. For example, members elected in November 2026 will be sworn in on January 3, 2027, beginning the 120th Congress.

Related Resources

How Congress Works

A clear overview of the House, Senate, committees, and the lawmaking process.

The Role of Congress: Checks and Balances

How Congress checks the executive and judicial branches through constitutional powers.

What Can Congress Do?

Can Congress declare war, override a veto, impeach a cabinet member, remove a senator, overrule the Supreme Court, or invoke the 25th Amendment? Question by question, with live vote math.

Congressional Terms Explained

What a caucus, censure, hearing, inquiry and joint resolution are, what "congressional" and "congressman" mean, and what Congress consists of.