2026 results · Missouri · county

Jefferson County, Missouri

Onder carried Jefferson County by 19.1 points in the Missouri 3rd District, 22.0 points more Democratic than the 2024 presidential vote here (R+41.1). 2 races have votes counted here.

Jefferson County on the national map

Votes counted, Missouri 3rd District: 24,005; 65% of the 37,107 votes for president in 2024
2026 margin: R+19.1
2024 president: R+41.1
Shift from 2024: 22.0 pts → D

The House

Jefferson County is split between 2 districts; each line is the county’s own part of that district.

Missouri 3rd DistrictJefferson County's part of the district · Bob Onder won · R+8.5 across the district
39.0% Bethany Mann58.2% Bob Onder
R+19.124,005 votes
22.0 pts → D2024 R+41.1
Missouri 8th DistrictJefferson County's part of the district · Jason Smith won · R+38.6 across the district
41.3% Christopher Reichard55.2% Jason Smith
R+13.953,012 votes
20.3 pts → D2024 R+34.2

Counts come from each race’s official source, named on its own page. Margins are the leading two candidates’ difference in points of all votes counted. 2024 is the presidential vote, Harris against Trump, on the same ground (for a House district, the county’s part of it). A county is not compared with 2024 until a quarter of its 2024 vote is counted. Ranks are among the state’s counties with votes counted in the same race.