akashic
1876–2024
State Senate District 21·Montana

Montana 21st State Senate District delivered R+22 in 2024 — Republican for decades.

One of Montana's most Republican-leaning legislative districts

1876 — 2024·38 elections
MT
Latest
R+22
in 2024
Archetype
Republican loyalist
since the recent cycles
Population
36,839
2024 ACS

Montana 21st State Senate District, Montana: Republican loyalist district. In 2024, voted R+22%. Republican peak: R+48 in 1904.

Key facts

2024 presidential margin
R+22MIT Election Lab
Political archetype
Republican loyalistAkashic typology
Population
36,8392024 5-year
Median household income
$70,3172024 5-year
White (non-Hispanic)
68.1%2024 5-year
Black
0.6%2024 5-year
Hispanic / Latino
5.9%2024 5-year
Peak Democratic margin
D+27 in 1936MIT Election Lab
Peak Republican margin
R+48 in 1904MIT Election Lab
2024 results by constituent county
3 counties · 0 D · 3 R
R+60
D+60
One cell per constituent county. Ordered by 2024 D-vs-R margin (bluest first). Hover for county-level numbers.
38 presidential elections
Source · MIT Election Lab · ICPSR · VEST (precinct-level 2024).
YearWonMarginDemocraticRepublicanTotal
R
−21.7%
6,0959,62816,258
R
−17.4%
6,7629,69316,888
R
−19.2%
5,1537,91914,430
R
−8.0%
6,5037,65814,521
D
+6.2%
7,9426,99615,299
R
−17.1%
5,6358,01213,903
R
−11.9%
5,1726,65212,467
D
+3.9%
5,6975,21312,343
D
+2.8%
5,0344,67912,597
R
−3.9%
5,4025,84811,387
R
−15.4%
5,4117,40212,945
R
−18.2%
3,8055,76510,777
R
−7.4%
4,5605,2989,999
R
−24.5%
3,4145,7319,473
R
−20.7%
2,9294,6058,081
D
+13.4%
4,8493,7028,587
R
−16.7%
3,2284,5247,783
R
−23.6%
2,7484,4437,191
R
−33.1%
2,3484,6757,038
R
−2.0%
2,7082,8185,614
R
−3.5%
2,4612,6385,126
D
+6.1%
3,1722,8076,019
D
+27.4%
3,2381,8185,176
D
+16.8%
2,5021,7674,368
R
−21.9%
1,4992,3423,853
R
−40.6%
4901,7893,200
R
−36.2%
9592,1233,212
D
+14.4%
1,5291,1352,734
O
+1.7%
231218769
R
−25.0%
205357607
R
−48.1%
88266370
R
−11.0%
95119218
D
+14.3%
8463147
R
−12.3%
5470130
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Demographics

Race, ethnicity, and ancestry
Click any group to see the ancestries typically reported within it.
German
22.3%
Irish
10.3%
English
9.7%
American
4.1%
Italian
2.2%
Scottish
1.9%
French
1.7%
Source · American Community Survey 5-year estimates, 2024 release. Hispanic/Latino is an ethnicity that overlaps the race categories, so these shares can total more than 100%. Ancestry is a self-reported, multiple-response item; ancestry percentages do not sum to the parent race percentage.
Age distribution by sex
Median age: 36.9 in this county, 39.1 nationally
Male
Age
Female
0.6%
85+
1.2%
2.3%
75–84
2.7%
5.0%
65–74
5.4%
6.0%
55–64
6.1%
5.3%
45–54
5.5%
6.4%
35–44
6.4%
6.4%
25–34
6.5%
4.5%
18–24
4.2%
10.0%
5–17
9.5%
3.0%
<5
3.1%
Source · American Community Survey 5-year estimates, 2024 release.
Median household income
2024 inflation-adjusted dollars
$70,317
State Senate District 21 ranks near the middle of US counties.
State Senate District 21$70,317
Montana$72,509
United States$80,734
Source · American Community Survey 5-year estimates, 2024 release.
Poverty rate
All persons below federal poverty line
13.6%
Children face moderate poverty.
Children under 1815.7%
Working age (18–64)12.7%
Seniors (65+)11.4%
Source · American Community Survey 5-year estimates, 2024 release.
Language at home
Population aged 5 and older
90.6%
speak English only
Other languages6.7%
Spanish1.3%
Other Indo-European0.9%
Asian & Pacific Islander0.5%
Source · ACS 5-year estimates, 2024.
Religious adherents
Adherents per capita by tradition
Catholic & Orthodox
12.9%
Other Christian
10.9%
Mainline Protestant
5.6%
Pentecostal & Holiness
3.0%
Baptist
2.8%
Methodist
0.8%
Non-Christian
0.1%
Source · 2020 US Religion Census. Remaining 63.8% of residents not counted as adherents by any reporting body.

With a 2024 presidential margin of R+58.9, this sparsely populated district of roughly 20,000 residents ranks among the most lopsided in the state, reflecting the deep rural conservatism of Montana's interior.

The Republican margin in Montana 21st State Senate District reached its widest at forty-eight points in 1904. The margin in 2024 was twenty-two points, in line with the district's deep historical pattern.

Its loyalty is rooted in its place. Median household income of $70,317, a 68% non-Hispanic-white share, and a population of 36,839 together describe a district whose political habits are deeply settled.

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 →

Cite this page
All citations released under CC BY 4.0. Attribution: Akashic Intelligence.
State Senate District 21, Montana. Akashic. https://akashic.app/sld-upper/30021/. Accessed May 20, 2026. License: CC BY 4.0.
License: CC BY 4.0

Frequently asked questions

How did State Senate District 21, Montana vote in 2024?
In 2024, State Senate District 21, Montana voted Republican by 21.7 points (R+22), carried by the Republican candidate. Out of 16,258 votes cast, 6,095 went Democratic and 9,628 went Republican.
What is State Senate District 21, Montana's political archetype?
Akashic classifies State Senate District 21, Montana as a "Republican loyalist" district based on its long-arc presidential voting pattern. Across 38 elections in the dataset, the district has voted Democratic 9 times, Republican 24 times, and other 1 times.
When did State Senate District 21, Montana last vote Democratic?
The most recent presidential election in which State Senate District 21, Montana voted Democratic was 2008.
How many people live in State Senate District 21, Montana?
State Senate District 21, Montana has a population of 36,839 according to the 2024 American Community Survey 5-year estimates from the US Census Bureau.
What is the median household income in State Senate District 21, Montana?
Median household income in State Senate District 21, Montana is $70,317 — below the national median of $80,734. The Montana state median is $72,509.
What is the political history of State Senate District 21, Montana?
Akashic tracks 38 presidential elections in State Senate District 21, Montana from 1876 to 2024. Of those, 9 went Democratic and 24 went Republican. The district's archetype — "Republican loyalist" — captures the overall trajectory of that voting record.