Mid-Decade Redistricting Wave Scrambles House Map Ahead of 2026

Six states already have new maps, with more redraws moving through legislatures and courts as both parties test mid-decade changes.

Texas state Rep. Matt Morgan holds a map of the new proposed congressional districts in the state during a legislative session at the Texas Capitol in Austin, Texas, on Aug. 20, 2025. Sergio Flores/Reuters

Mid-decade redistricting—once an exception to the once-per-decade routine after each census—is now reshaping the U.S. House map in the mid-2020s. Legislatures, voters, and courts in both parties’ strongholds are reopening congressional lines ahead of the 2026 midterms.

With three House seats vacant, the current majority mark is 217 votes. Republicans hold 218, giving Speaker Mike Johnson (R-La.) only a one-seat lead on tough party-line votes.