Montana House of Representatives seat · lines in effect since 2024
Montana House District 66
A district of about 14,000 people, 64% of adults with a bachelor's degree. It votes D+12.2 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 | D+19.1 | D+6.3 | D+21.6 | No race |
| Governor | D+14.7 | No race | No race | D+14.6 | No race |
| Montana House of Representatives | No race | No race | No race | D+13.5 | D+26.2 |
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 66.
Higher than 97% of seats.
Lower than 95% of seats.
Higher than 58% of seats.
Higher than 66% of seats.
Higher than 62% of seats.
Less dense than 58% 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 8355% college gradsD+9.9Held DDistrict 65
54% college gradsD+14.2Held DDistrict 57
52% college gradsD+1.3Held DDistrict 93
50% college gradsD+23.9Held 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
Who has held it
These lines took effect in 2024.
- Eric Matthews (D)
2025– · Won 2024 by 13.5, 2026 by 26.2
Source: Past results: 99chambers results archive (MEDSL, Klarner, state election offices)