Statistics on U.S. Congress candidates and incumbents, 2018

• Primary elections
  • The Heart of the Primaries
  • Democratic Party primaries
  • Republican Party primaries
• Federal elections
  • U.S. Congress
  • U.S. Senate
  • U.S. House
  • Congressional special elections
• State elections
  • Ballot measures
  • State executives
  • State legislatures
  • State legislature special elections
  • State supreme courts
  • Intermediate appellate courts
• Local elections
  • Ballot measures
  • Municipal government
  • School boards
  • Trial courts
  • Political recalls
• Voter information
  • Sample ballot
  • Election calendar
  • Election results
  • Poll opening and closing times
  • Voting policies

See also: The Heart of the Primaries, Democratic Party primaries, 2018, and Republican Party primaries, 2018

This page provides an overview of statistics on congressional elections in 2018, including information about the partisan affiliation of candidates, the number of open seats by party, and the potential impact of the 2016 presidential election on incumbents.

Candidate breakdown

This chart shows the partisan affiliation of all candidates running for U.S. Congress.

Partisan breakdown

This chart shows the partisan breakdown of currently sitting members of Congress and those who have resigned or will retire after 2018, making the seat open.

*Includes two independent senators who caucus with the Democrats

Incumbents and presidential election results

This chart indicates how many seats up for election are held by an incumbent from a different party than the presidential candidate who won that state in 2016.