Montana State Senate seat · lines in effect since 2024
Montana Senate District 21
A district of about 27,000 people, 21% of adults with a bachelor's degree. It votes R+1.2 relative to the nation for president.
Where it sits among all 50 seats
Every Montana 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.
| 2016 | 2018 | 2020 | 2024 | |
|---|---|---|---|---|
| U.S. Senate | No race | D+27.8 | D+7.1 | D+22.6 |
| Governor | D+26.2 | No race | No race | R+2.8 |
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 50 seats. Small marks are other seats in Montana. The black marker is District 21.
Lower than 98% of seats.
Lower than 84% of seats.
Higher than 86% of seats.
Higher than 88% of seats.
Lower than 82% of seats.
Less dense than 78% 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 4629% college gradsD+13.8Not up in 2026District 16
26% college gradsD+7.1Not up in 2026District 8
22% college gradsD+12.2Held DDistrict 42
43% college gradsR+11.8Held D
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