WISCONSIN — The filing deadline for candidates running for the U.S. House of Representatives in Wisconsin passed on June 1, 2026, establishing the field for the upcoming primary election. Thirty-one candidates are running across Wisconsin's eight U.S. House districts, marking the highest number of candidates since 2014.

Overall, 19 Democrats and 12 Republicans are seeking seats in the state's congressional districts. This results in an average of 3.9 candidates per district for the 2026 election. For comparison, the average was 2.9 candidates per district in 2024, 2.8 in 2022, 2.9 in 2020, 3.1 in 2018, 2.9 in 2016, and 3.4 in 2014.

Nine primaries are contested in Wisconsin for the U.S. House in 2026, consisting of seven Democratic and two Republican primaries. This number is higher than the five contested primaries in 2024, and the six contested primaries observed in 2022, 2020, and 2018. Eight contested primaries took place in 2016 and 2014.

Rep. Tom Tiffany, a Republican representing the 7th Congressional District, is not seeking re-election to the U.S. House; instead, Tiffany is running for governor of Wisconsin. This makes the 7th Congressional District an open seat in the 2026 election, a situation that has occurred in at least one U.S. House district in Wisconsin each year since 2014. The 7th District has attracted the most candidates, with eight individuals running, including three Democrats and five Republicans.

Two incumbents, Rep. Mark Pocan (D-2nd) and Rep. Gwen Moore (D-4th), are running in contested primaries. In 2024, there were no incumbents in contested primaries. In previous cycles, three incumbents faced contested primaries in 2022, one in 2020, two in 2018, four in 2016, and three in 2014.

Democrats filed to run in all eight of Wisconsin's U.S. House districts, ensuring the party has a candidate in every race. No U.S. House district in Wisconsin is guaranteed to Republicans in the 2026 election. The 2nd Congressional District is guaranteed to Democrats because no Republicans filed to run. Wisconsin will hold U.S. House primaries on August 11, 2026, alongside Alabama, Connecticut, Minnesota, and Vermont. Primary elections in Wisconsin are determined by a plurality vote, meaning the candidate with the highest number of votes wins.