This year’s filing deadline for candidates running for the U.S. House of Representatives in Missouri was March 31, 2026.
These are the first elections to take place since the Missouri General Assembly passed a new congressional map. The Missouri House of Representatives passed it on Sept. 9, 2025. The Missouri Senate passed it on Sept. 12, 2025. Missouri Gov. Mike Kehoe (R) signed the new congressional map into law on Sept. 28, 2025.
This year has the second-highest number of contested primaries since 2014. In total, 14 primaries — six Democratic and eight Republican — are contested this year. In total, there were 12 contested primaries in 2024, 14 in 2022, 10 in 2020, 11 in 2018, 13 in 2016, and 10 in 2014.