Montana House of Representatives seat · lines in effect since 2024
Montana House District 31
It votes D+5.3 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 | |
|---|---|---|---|---|
| U.S. Senate | No race | D+30.9 | D+19.0 | D+28.4 |
| Governor | D+30.3 | No race | No race | D+1.9 |
| Montana House of Representatives | No race | No race | No race | D+19.8 |
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 has held it
These lines took effect in 2024.
- Natalie Oneal (D)
2027– · Won 2026 unopposed - Frank J. Smith (D)
2025–2027 · Won 2024 by 19.8
Source: Past results: 99chambers results archive (MEDSL, Klarner, state election offices)