Montana 21st State Senate District · the strongest Democratic and Republican presidential performances recorded here, measured three ways.
1892–2024 · 34 presidential cycles
Highest vote share
Largest share of the presidential candidate vote cast here.
Democratic
Woodrow Wilson1916
72.6%
1,717 votes · D+46.6 · modeled estimate
Runner-up · Franklin D. Roosevelt, 1936 · 71.3%
Republican
Benjamin Harrison1892
61.1%
11 votes · R+33.3 · modeled estimate
Runner-up · William McKinley, 1900 · 61.0%
Most votes
Largest number of votes cast for the party’s presidential nominee here.
Democratic
Barack Obama2008
5,272votes
66.5% of the vote · D+35.0 · modeled estimate
Runner-up · Barack Obama, 2012 · 4,261 votes
Republican
Donald Trump2020
3,486votes
47.0% of the vote · D+3.9 · modeled estimate
Runner-up · Donald Trump, 2024 · 3,351 votes
Best relative to the U.S.
This Place’s margin against the national margin in the same election — positive when it leaned toward the party more than the country did.
Democratic
William J. Bryan1908
+50.3pts D vs U.S.
Place D+40.8 · U.S. R+9.6 · modeled estimate
Runner-up · Alton B. Parker, 1904 · +44.2 pts
Republican
Benjamin Harrison1892
+35.0pts R vs U.S.
Place R+33.3 · U.S. D+1.7 · modeled estimate
Runner-up · William McKinley, 1900 · +14.4 pts
current representation
Current officeholders
RGayle LammersState Senate · 21
State legislative officeholder from OpenStates nightly current-legislator data.
U.S. House elections · 1 House
Senate and governor results are in the Office selector at the top of this page.
U.S. House
Each row is a county-allocated estimate of U.S. House votes for this district — county returns apportioned onto its boundary, not precinct-counted. “Vote lead” is the estimated local lead here, not necessarily the winner of the full contest.
Source · Akashic county-allocated estimate from certified county returns, House; not precinct-counted.
Year
Vote lead
Democratic
Republican
Total
2020
R
48.0%4,082
52.0%4,418
8,500
Montana 21st State Senate District sits in the Northern Rockies. In 2024 it voted Republican.
Across the recorded series it reached a Democratic high of 46.6 points in 1916 and a Republican high of 33.3 points in 1892. Between 2020 and 2024 the district moved 6.1 points toward the Republican candidate; the 2024 margin was 2.2 points.
A population of 20,560, a 33% non-Hispanic-white share, and a median household income of $58,100 describe the district. The district's voting pattern over the last decade is most similar to that of State Senate District 16 and State Senate District 8.
Akashic
Political twins — state-senate districts
The state-senate districts whose fingerprint — 2000–2024 trajectory, demographics, ancestry, religion — sits closest to this one, and why.
Twin score (0–100) = weighted cosine between tier-standardized fingerprints: presidential margins 2000–2024 with 12-yr trend and elasticity, ACS income, age, education, population and race, top reported ancestries, and religious adherence — chips name the closest-shared dimensions and the widest gap. Re-weight the groups in the twins explorer.
Compare two places, side by side
Twelve curated comparisons line up election history, demographics, and the divergence story for two places at a glance. Browse all comparisons → · Or open the source-auditable district brief for electoral baseline, electorate, current-cycle coverage, geography, official dates, and methodology. Open campaign intelligence report →
Cite this page
All citations released under CC BY 4.0. Attribution: Akashic Intelligence.
Montana 21st State Senate District. Akashic. https://akashic.app/sld-upper/30021/. Accessed May 20, 2026. License: CC BY 4.0.
How did Montana 21st State Senate District vote in 2024?
In 2024, Montana 21st State Senate District voted Republican by 2.2 points (R+2.2), carried by the Republican candidate. Out of 6,812 votes cast, 3,200 went Democratic and 3,351 went Republican.
When did Montana 21st State Senate District last vote Democratic?
The most recent presidential election in which Montana 21st State Senate District voted Democratic was 2020.
How many people live in Montana 21st State Senate District?
Montana 21st State Senate District has a population of 20,560 according to the 2024 American Community Survey 5-year estimates from the US Census Bureau.
What is the median household income in Montana 21st State Senate District?
Median household income in Montana 21st State Senate District is $58,100 — below the national median of $80,734. The Montana state median is $72,509.
What is the political history of Montana 21st State Senate District?
Akashic tracks 38 presidential elections in Montana 21st State Senate District from 1876 to 2024. Of those, 25 went Democratic and 9 went Republican.