Missouri State Senate seat · lines in effect since 2022
Missouri Senate District 21
A district of about 190,000 people, 29% of adults with a bachelor's degree. It votes R+36.2 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 | |
|---|---|
| U.S. Senate | R+29.2 |
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 21.
Higher than 55% of seats.
Higher than 58% of seats.
Higher than 55% of seats.
Lower than 70% of seats.
Lower than 85% of seats.
Less dense than 79% 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 3128% college gradsR+37.0Not up in 2026District 6
29% college gradsR+49.3Held RDistrict 10
25% college gradsR+46.2Held RDistrict 20
31% college gradsR+48.4Held 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