Missouri House of Representatives seat · lines in effect since 2022
Missouri House District 55
A district of about 39,000 people, 30% of adults with a bachelor's degree. It votes R+39.4 relative to the nation for president.
Where it sits among all 163 seats
Every Missouri House of Representatives seat by partisan lean, from most Democratic to most Republican. Lean is the seat's presidential vote on current lines, relative to the nation.
Democratic
Source: 99chambers: 2024 and 2020 presidential results on current lines, relative to the nation (2024 weighted 3:1)Updated Oct 16, 2026, 5:19 AM ET
Every race on these lines
Results recomputed from precinct returns as if today's boundaries had always existed, so years compare like for like.
| 2018 | 2026 | |
|---|---|---|
| U.S. Senate | R+30.3 | No race |
| Missouri House of Representatives | No race | R+23.3 |
Outlined: the race for this seat itselfBlank: no race that year
Source: 99chambers results archive: precinct results allocated to current lines; 2026: civicAPIUpdated Nov 7, 2026, 3:01 PM ET
Who lives here, compared
Grey bars show the spread of all 163 seats. Small marks are other seats in Missouri. The black marker is District 55.
Higher than 52% of seats.
Higher than 62% of seats.
Higher than 52% of seats.
Lower than 71% of seats.
Lower than 79% of seats.
Less dense than 64% of seats.
Source: Census Bureau, American Community Survey 2020–2024 5-year estimates, allocated to current linesUpdated Oct 13, 2026, 5:06 AM ET
Seats most like this one
Nearest seats on demographics, density and lean.
District 832% college gradsR+36.2Held RDistrict 109
29% college gradsR+43.0Held RDistrict 111
28% college gradsR+41.6Held RDistrict 131
30% college gradsR+50.5Held R
Source: Census Bureau, American Community Survey 2020–2024 5-year estimates, allocated to current lines; 99chambers: 2024 and 2020 presidential results on current lines, relative to the nation (2024 weighted 3:1)Updated Oct 16, 2026, 5:19 AM ET
Who has held it
These lines took effect in 2022.
- William "bill" Irwin (R)
2025– · Won 2024 unopposed, 2026 by 23.3 - Mike Haffner (R)
2023–2025 · Won 2022 unopposed
Source: Past results: 99chambers results archive (MEDSL, Klarner, state election offices)