99chambers

Montana State Senate seat · lines in effect since 2024

Montana Senate District 10

A district of about 22,000 people, 25% of adults with a bachelor's degree. It votes R+6.6 relative to the nation for president.

Jeremy Trebas (R) · since Nov 8, 2022Flipped in 2026Next election Nov 5, 2030The 2026 race →

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.

R+6.621st most
Democratic
Most DemocraticMost Republican26th seat · the majority lineDistrict 10

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.

20162018202020242026
U.S. SenateNo raceD+16.7D+1.0D+11.2No race
GovernorD+19.0No raceNo raceR+9.1No race
Montana State SenateNo raceNo raceNo raceNo raceD+13.3

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 50 seats. Small marks are other seats in Montana. The black marker is District 10.

Adults with a bachelor's degree25% 20th pct · 40th of 50 in MT

Lower than 80% of seats.

White adults without a degree61% 63rd pct · 19th of 50 in MT

Higher than 63% of seats.

Hispanic residents6% 80th pct · 11th of 50 in MT

Higher than 80% of seats.

Black residents1% 96th pct · 3rd of 50 in MT

Higher than 96% of seats.

Asian residents1% 65th pct · 18th of 50 in MT

Higher than 65% of seats.

People per square mile4,237 98th pct · 2nd of 50 in MT

Denser than 98% 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 12
33% college gradsR+14.7Held RDistrict 41
35% college gradsD+5.6Held DDistrict 24
27% college gradsR+4.6Not up in 2026District 25
38% college gradsR+24.1Held 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.

  1. Margaret Mitchell (D)
    2027– · Won 2026 by 13.3

Source: Past results: 99chambers results archive (MEDSL, Klarner, state election offices)