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state senate district

Montana 21st State Senate District

Office (updates table and map)

President margin by year

Place winner margin

1892–2024 · D minus R

Full record · 1892 → 2024

2024

Boundary by 2024 margin · Precinct returns · VEST · MIT Election Lab

The precinct map shows the 2024 presidential vote; the timeline scrubs the district’s overall result across 1892–2024, on its current boundaries.

People and households

Who lives here

Exact values for this place, its state, and the United States.

Race · ethnicity · ancestry

Communities and origins

Navajo0.8%——

Blackfeet0.5%1.0%—

German11.5%22.9%12.5%

Irish5.3%13.5%9.4%

English5.0%13.1%9.5%

Norwegian3.7%7.5%—

American2.1%5.4%5.3%

Italian1.1%3.2%4.8%

Scottish1.0%2.6%1.3%

Swedish0.9%1.4%—

Mexican3.3%2.9%11.3%

Spanish0.6%0.3%—

Spaniard0.4%0.3%—

Hispanic or Latino counts residents of any race; the race groups count only their non-Hispanic residents, so the groups are mutually exclusive and sum to 100%. Expand a row to see ancestries reported within that group.

Age and life stage

Measure	MT SD 21	Montana	United States
Median age	34.3	40.8	39.1
Age 18–24	8.7%	9.1%	9.2%
Age 65 and older	17.2%	20.0%	17.2%

Household economy

Measure	MT SD 21	Montana	United States
Median household income	$58,100	$72,509	$84,427
Poverty rate	23.3%	11.5%	12.5%
Bachelor's degree or higher (25+)	28.8%	35.3%	35.6%

Housing and tenure

Measure	MT SD 21	Montana	United States
Owner-occupied homes	62.9%	69.2%	65.2%
Renter-occupied homes	37.1%	30.8%	34.8%
Median home value	$161,200	$375,800	$332,700
Median gross rent (monthly)	$715	$1,081	$1,413
Renters paying 30%+ of income	24.8%	44.8%	51.1%
Vacant housing units	13.7%	13.2%	10.1%

Getting to work

Measure	MT SD 21	Montana	United States
Mean commute	18.6 min	19.1 min	26.4 min
Commutes 60 minutes or more	3.0%	4.8%	8.6%
Drives alone to work	71.6%	71.1%	68.8%
Takes public transit	1.6%	0.6%	3.2%
Works from home	6.6%	12.5%	15.1%

Languages at home

Measure	MT SD 21	Montana	United States
Speaks a non-English language at home	9.4%	4.2%	22.3%
Spanish	1.3%	1.5%	13.6%
Other languages	6.7%	0.7%	0.8%

Religious landscape

Measure	MT SD 21	Montana	United States
Catholic	—	10.3%	18.6%
Evangelical Protestant	—	13.6%	16.5%
Unclaimed / not counted	—	65.3%	51.5%

Origins and service

Measure	MT SD 21	Montana	United States
Foreign-born residents	1.0%	2.3%	14.1%
Naturalized citizens	0.4%	1.2%	7.4%
Not U.S. citizens	0.6%	1.1%	6.8%
Veterans (18+)	6.5%	9.0%	6.2%
Income inequality (Gini)	0.460	0.465	0.483

American Community Survey 2024 5-year (CVAP, income, age, poverty, education, language, race, ancestry) · 2020 U.S. Religion Census (ASARB) — congregational adherents; unclaimed is the residual not counted by congregations · American Community Survey 2024 — housing and tenure (B25003, B25002, B25077, B25064, B25070), commuting (B08013, B08303, B08301), origins and service (B05002, B21001, B19083).

President results by year

Modeled candidate-vote estimate on current district boundaries

HarrisDemocratic47.0%3,200TrumpRepublican49.2%3,351OtherAll other candidates3.8%261

R+2.2

Lead: 151
Total: 6,812
vs nation: R+0.7

modeled Census-place estimatemodeled estimate

BidenDemocratic50.9%3,777TrumpRepublican47.0%3,486OtherAll other candidates2.1%156

D+3.9

Lead: 291
Total: 7,419
vs nation: R+0.5

modeled Census-place estimatemodeled estimate

ClintonDemocratic48.4%3,143TrumpRepublican43.7%2,838OtherAll other candidates7.9%515

D+4.7

Lead: 305
Total: 6,496
vs nation: D+2.6

modeled Census-place estimatemodeled estimate

ObamaDemocratic60.5%4,261RomneyRepublican37.7%2,656OtherAll other candidates1.8%125

D+22.8

Lead: 1,605
Total: 7,042
vs nation: D+18.9

modeled Census-place estimatemodeled estimate

ObamaDemocratic66.5%5,272McCainRepublican31.6%2,500OtherAll other candidates1.9%151

D+35.0

Lead: 2,772
Total: 7,923
vs nation: D+27.7

modeled Census-place estimatemodeled estimate

KerryDemocratic54.0%3,593BushRepublican44.5%2,965OtherAll other candidates1.5%101

D+9.4

Lead: 628
Total: 6,659
vs nation: D+11.9

modeled Census-place estimatemodeled estimate

GoreDemocratic56.4%3,579BushRepublican38.9%2,468OtherAll other candidates4.7%298

D+17.5

Lead: 1,111
Total: 6,345
vs nation: D+17.0

modeled Census-place estimatemodeled estimate

ClintonDemocratic58.8%3,892DoleRepublican29.6%1,958OtherAll other candidates11.7%774

D+29.2

Lead: 1,934
Total: 6,624
vs nation: D+20.7

modeled Census-place estimatemodeled estimate

Key facts

2024 presidential margin: R+2.2MIT Election Lab
Population: 20,5602024 5-year
Population density: 3.8 / sq mi2024 5-year · TIGER/Line
Land area: 5,451 sq miTIGER/Line
Median household income: $58,1002024 5-year
White (non-Hispanic): 32.9%2024 5-year
Black: 0.2%2024 5-year
Hispanic / Latino: 4.7%2024 5-year
Peak Democratic margin: D+46.6 in 1916MIT Election Lab
Peak Republican margin: R+33.3 in 1892MIT Election Lab
Most similar: State Senate District 16, MT · twin score 95.8

presidential history

Party record book

Montana 21st State Senate District · the strongest Democratic and Republican presidential performances recorded here, measured three ways.

1892–2024 · 34 presidential cycles

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.

Political twins — state-senate districts

The state-senate districts whose fingerprint — 2000–2024 trajectory, demographics, ancestry, religion — sits closest to this one, and why.

State Senate District 16

elasticity2008 marginpopulation scale

State Senate District 8

elasticity2008 marginpopulation scale≠ % unaffiliated

State Senate District 3

elasticity2008 margin12-yr trend≠ college share

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.

District research tools

Open the source-auditable district brief for electoral baseline, electorate, current-cycle coverage, geography, official dates, and methodology. Open campaign intelligence report → · Browse all comparisons →

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.

License: CC BY 4.0

Montana at the ballot boxAll elections →

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Places within Montana 21st State Senate District

counties it covers3

Big Horn County Rosebud County Yellowstone County

Frequently asked questions

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.