2020 vote margin




More voters

Fewer voters

States with no approved map

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Updated Nov. 8 at 10:02 p.m.Originally published May 17, 2022

Each decade, the federal government compiles and publishes updated population figures for all 50 states in a census required by the U.S. Constitution. Seats in the U.S. House of Representatives are then awarded, with some states gaining or losing seats while others retain the same amount. In either case, states must redraw their district lines to make sure each district contains roughly the same number of people.

Redistricting has become a highly politicized process as parties jockey for advantage in the midterms to determine control of the narrowly divided House. Where the lines are drawn can heavily favor one party over the other.

Next, explore our guide to the 2022 midterm elections.

Adrian Blanco, Ted Mellnik and Harry Stevens contributed to this report.

About this story

The Washington Post estimated the lean of congressional districts using 2020 presidential results by precinct from Decision Desk HQ and estimates where the actual votes at the precinct level were unavailable or incomplete. In counties where more than 1 percent of the actual vote was not available by precinct, the map visualizes the actual votes at the county level. New Jersey results are at the township level.

Vote estimates have been used to calculate the lean of districts in all of Alabama, Alaska, Louisiana, Rhode Island and Virginia, and parts of Florida, Idaho, Kentucky, Michigan, Missouri, New Jersey, New York, North Carolina, Oklahoma, Pennsylvania, South Carolina, South Dakota and Tennessee because detailed results are not available.

See something that doesn’t look right? Let us know.

Editing by Kevin Uhrmacher. Copy editing by Anjelica Tan.