Among the most closely-watched contests will be for supremacy in the House of Representatives, where Republicans now hold a 220-213 advantage.

Democrats believe they can flip the chamber while the GOP is gunning to increase its majority in the Nov. 3, 2026 election.

The Democratic Congressional Campaign Committee (DCCC) has identified 35 Republican-held congressional districts "in play," while the National Republican Congressional Committee (NRCC) has a "target list" of 26 "vulnerable" incumbent Democrats it believes GOP challengers can unseat.

Among these races are 13 House seats Democrats won in districts President Donald Trump captured, and three Republicans won in districts then-Vice President Kamala Harris secured in November 2024.

These 61 House contests include anticipated tight tussles in eight of California's 52 House seats, with the NRCC putting the bull's eye on five incumbent Democrats, and the DCCC spotlighting three Republicans. Democrats now have a 43–9 bulge in California's congressional delegation.

Other states with multiple House races that could be 2026 dogfights include five each in Florida and Ohio. In both states, the NRCC believes it can knock off two incumbent Democrats, and the DCCC is targeting three sitting Republicans.

Four New York House incumbents are in hot seats with the NRCC confident it can defeat three sitting Democrats—two on Long Island—and the DCCC targeting Rep. Mike Lawler (R-N.Y.) in the lower Hudson Valley.

Once again, the NRCC will attempt to win at least one of three Democrat-held Nevada seats in the Las Vegas area.

The sitting president's party has lost House seats in every midterm but two since 1950.

Of course, with Texas lawmakers set to redraw the state's 38 congressional districts and California legislators threatening to do the same, the playing field could be significantly altered by the end of thr year. Stay tuned.

Here are 16 prospective 2026 midterm House races listed chronologically by primary date that could determine which party controls the chamber when the 120th Congress convenes in January 2027.