State Senate District 21 State Senate District (MO) — Elections 1876–2024

Missouri 21st State Senate District, Missouri: Republican loyalist district. In 2024, voted R+20%. Democratic peak: D+37 in 1932.

Key facts

2024 presidential margin: R+20MIT Election Lab
Political archetype: Republican loyalistAkashic typology
Population: 292,0212024 5-year
Median household income: $82,2372024 5-year
White (non-Hispanic): 82.4%2024 5-year
Black: 5.6%2024 5-year
Hispanic / Latino: 6.9%2024 5-year
Peak Democratic margin: D+37 in 1932MIT Election Lab
Peak Republican margin: R+34 in 1972MIT Election Lab

2024 results by constituent county

6 counties · 0 D · 6 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).
Year	Won	Margin	Democratic	Republican	Total
2024	R	−20.1%	57,018	86,405	146,122
2020	R	−18.3%	57,150	83,335	143,377
2016	R	−22.2%	45,716	74,287	128,965
2012	R	−13.8%	51,928	69,020	123,950
2008	R	−4.8%	60,535	66,797	129,175
2004	R	−11.0%	52,409	65,491	118,679
2000	R	−2.9%	48,505	51,519	102,557
1996	D	+7.9%	43,800	36,549	91,382
1992	D	+10.0%	41,079	31,129	99,508
1988	R	−0.9%	41,820	42,591	84,784
1984	R	−22.2%	33,576	52,719	86,295
1980	R	−6.6%	37,614	43,229	84,798
1976	D	+6.1%	42,818	37,886	81,519
1972	R	−34.4%	25,190	51,551	76,741
1968	R	−4.6%	30,789	34,184	73,909
1964	D	+27.0%	44,850	25,792	70,642
1960	R	−3.1%	35,696	38,009	73,705
1956	R	−0.9%	33,388	33,972	67,360
1952	R	−3.9%	33,301	36,001	69,440
1948	D	+18.4%	34,526	23,794	58,421
1944	D	+3.3%	30,764	28,776	59,633
1940	D	+7.2%	37,012	32,013	69,157
1936	D	+19.9%	39,561	26,398	66,166
1932	D	+36.7%	39,981	18,429	58,726
1928	D	+1.4%	29,628	28,805	58,537
1924	D	+13.6%	30,623	23,040	55,753
1920	D	+9.6%	31,053	25,600	57,002
1916	D	+19.1%	20,161	13,622	34,191
1912	D	+30.4%	18,191	8,592	31,541
1908	D	+17.7%	19,059	13,267	32,753
1904	D	+14.2%	17,230	12,866	30,657
1900	D	+24.3%	21,213	12,822	34,583
1896	D	+27.6%	23,292	13,154	36,760
1892	D	+25.5%	19,006	10,901	31,814
1888	—	No data	—	—	—
1884	—	No data	—	—	—
1880	—	No data	—	—	—
1876	—	No data	—	—	—

Demographics

Race, ethnicity, and ancestry

Click any group to see the ancestries typically reported within it.

German

21.7%

English

13.8%

Irish

12.1%

American

6.3%

Italian

3.5%

Scottish

2.0%

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: 38.5 in this county, 39.1 nationally

Male

Age

Female

0.6%

85+

1.1%

2.3%

75–84

2.8%

4.6%

65–74

5.2%

6.3%

55–64

6.4%

6.1%

45–54

6.1%

6.8%

35–44

6.6%

6.8%

25–34

6.6%

4.4%

18–24

4.1%

8.9%

5–17

8.5%

3.0%

2.8%

Source · American Community Survey 5-year estimates, 2024 release.

Median household income

2024 inflation-adjusted dollars

$82,237

State Senate District 21 ranks near the middle of US counties.

State Senate District 21$82,237

Missouri$70,702

United States$80,734

Source · American Community Survey 5-year estimates, 2024 release.

Poverty rate

All persons below federal poverty line

9.8%

Child poverty is below the national average.

Children under 1812.0%

Working age (18–64)8.9%

Seniors (65+)11.9%

Source · American Community Survey 5-year estimates, 2024 release.

Language at home

Population aged 5 and older

93.5%

speak English only

Spanish3.3%

Asian & Pacific Islander1.2%

Other Indo-European1.1%

Other languages0.8%

Source · ACS 5-year estimates, 2024.

Religious adherents

Adherents per capita by tradition

Baptist

11.4%

Other Christian

9.6%

Methodist

7.1%

Catholic & Orthodox

6.9%

Mainline Protestant

5.1%

Pentecostal & Holiness

2.0%

Non-Christian

1.0%

Source · 2020 US Religion Census. Remaining 57.0% of residents not counted as adherents by any reporting body.

With a 2024 presidential margin of R+28, Missouri Senate District 21 ranks among the state's most one-sided constituencies, reflecting the broad rural realignment that has reshaped Missouri politics over the past two decades.

The Republican margin in Missouri 21st State Senate District reached its widest at thirty-four points in 1972. The margin in 2024 was twenty points, in line with the district's deep historical pattern.

Its loyalty is rooted in its place. Median household income of $82,237, a 82% non-Hispanic-white share, and a population of 292,021 together describe a district whose political habits are deeply settled.

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Cite this page

All citations released under CC BY 4.0. Attribution: Akashic Intelligence.

State Senate District 21, Missouri. Akashic. https://akashic.app/sld-upper/29021/. Accessed May 20, 2026. License: CC BY 4.0.

License: CC BY 4.0

Frequently asked questions

How did State Senate District 21, Missouri vote in 2024?

In 2024, State Senate District 21, Missouri voted Republican by 20.1 points (R+20), carried by the Republican candidate. Out of 146,122 votes cast, 57,018 went Democratic and 86,405 went Republican.

What is State Senate District 21, Missouri's political archetype?

Akashic classifies State Senate District 21, Missouri as a "Republican loyalist" district based on its long-arc presidential voting pattern. Across 38 elections in the dataset, the district has voted Democratic 19 times, Republican 15 times, and other 0 times.

When did State Senate District 21, Missouri last vote Democratic?

The most recent presidential election in which State Senate District 21, Missouri voted Democratic was 1996.

How many people live in State Senate District 21, Missouri?

State Senate District 21, Missouri has a population of 292,021 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, Missouri?

Median household income in State Senate District 21, Missouri is $82,237 — above the national median of $80,734. The Missouri state median is $70,702.

What is the political history of State Senate District 21, Missouri?

Akashic tracks 38 presidential elections in State Senate District 21, Missouri from 1876 to 2024. Of those, 19 went Democratic and 15 went Republican. The district's archetype — "Republican loyalist" — captures the overall trajectory of that voting record.

Missouri 21st State Senate District has voted Republican in seven straight presidential cycles.

Key facts

Demographics

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Frequently asked questions