99chambers

Montana House of Representatives seat · lines in effect since 2024

Montana House District 23

A district of about 3,400 people, 18% of adults with a bachelor's degree. It votes R+10.0 relative to the nation for president.

Eric Tilleman (R) · since Nov 5, 2024Next election Nov 7, 2028The 2026 race →

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.

R+10.044th most
Democratic
Most DemocraticMost Republican51st seat · the majority lineDistrict 23

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+17.5D+3.0D+5.1No race
GovernorD+22.7No raceNo raceR+16.7No race
Montana House of RepresentativesNo raceNo raceNo raceR+15.6R+2.8

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 lives here, compared

Grey bars show the spread of all 100 seats. Small marks are other seats in Montana. The black marker is District 23.

Adults with a bachelor's degree18% 5th pct · 92nd of 97 in MT

Lower than 95% of seats.

White adults without a degree69% 91st pct · 10th of 97 in MT

Higher than 91% of seats.

Hispanic residents6% 76th pct · 24th of 97 in MT

Higher than 76% of seats.

Black residents1% 90th pct · 11th of 97 in MT

Higher than 90% of seats.

Asian residents0% 0th pct · 89th of 97 in MT

Lower than 100% of seats.

People per square mile796 78th pct · 22nd of 97 in MT

Denser 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. 1 of the 4 flipped this year.

District 48
30% college gradsR+14.2Held RDistrict 20
28% college gradsR+8.9Flipped DDistrict 27
22% college gradsR+19.4Held DDistrict 73
MontanaD+9.8Held 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

Who has held it

These lines took effect in 2024.

  1. Eric Tilleman (R)
    2025– · Won 2024 by 15.6, 2026 by 2.8

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