Missouri State Senate seat · lines in effect since 2022
Missouri Senate District 12
A district of about 179,000 people, 21% of adults with a bachelor's degree. It votes R+56.9 relative to the nation for president.
Where it sits among all 34 seats
Every Missouri State Senate 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 | 2022 | 2026 | |
|---|---|---|---|
| U.S. Senate | R+41.7 | No race | No race |
| Missouri State Senate | No race | R+61.5 | R+39.4 |
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 34 seats. Small marks are other seats in Missouri. The black marker is District 12.
Lower than 79% of seats.
Higher than 88% of seats.
Lower than 82% of seats.
Lower than 76% of seats.
Lower than 79% of seats.
Least dense of 34 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 1821% college gradsR+53.8Held RDistrict 33
21% college gradsR+64.9Not up in 2026District 28
MissouriR+58.5Held RDistrict 27
25% college gradsR+55.9Not up in 2026
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.
- Rusty Black (R)
2023– · Won 2022 by 61.5, 2026 by 39.4
Source: Past results: 99chambers results archive (MEDSL, Klarner, state election offices)