Montana House of Representatives seat · lines in effect since 2024
Montana House District 40
A district of about 4,700 people, 15% of adults with a bachelor's degree. It votes R+48.0 relative to the nation for president.
Where it sits among all 100 seats
Every Montana 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.
| 2016 | 2018 | 2020 | 2024 | 2026 | |
|---|---|---|---|---|---|
| U.S. Senate | No race | R+18.9 | R+35.0 | R+35.6 | No race |
| Governor | R+7.6 | No race | No race | R+47.3 | No race |
| Montana House of Representatives | No race | No race | No race | R+48.9 | R+40.0 |
Outlined: the race for this seat itselfBlank: no race that year
Source: 99chambers results archive: precinct results allocated to current lines; 2026: Montana Secretary of StateUpdated Nov 7, 2026, 3:01 PM ET
Who lives here, compared
Grey bars show the spread of all 100 seats. Small marks are other seats in Montana. The black marker is District 40.
Lower than 99% of seats.
Highest of 97 seats.
Higher than 94% of seats.
Lower than 100% of seats.
Lower than 100% of seats.
Denser than 53% 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 5425% college gradsR+42.2Held RDistrict 87
27% college gradsR+48.1Held RDistrict 1
MontanaR+54.5Held RDistrict 39
25% college gradsR+34.3Held 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 2024.
- Mike Vinton (R)
2025– · Won 2024 by 48.9, 2026 by 40.0
Source: Past results: 99chambers results archive (MEDSL, Klarner, state election offices)