Mid-decade redistricting has driven recent shifts in several states' congressional districts ahead of the November 2026 House elections, with legislatures enacting new maps outside the standard post-census cycle. Starting in summer 2025, Republican-controlled states including Texas, North Carolina, Florida, Missouri, Tennessee, Ohio, Alabama, and Louisiana passed revised lines, often following special sessions and influenced by the Supreme Court's Louisiana v. Callais ruling that narrowed Voting Rights Act challenges to race-based districting. California voters approved counter-maps via ballot measure, while Utah also finalized changes; multiple other attempts, such as in Virginia, were blocked by courts or voters. These developments reflect partisan competition over district boundaries, with ongoing litigation in a few states and candidate filing deadlines already passed in most. The maps currently in place will determine which districts are used on election day unless further court orders intervene.