Iowa 21st State House District, Iowa: Republican loyalist district. In 2024, voted R+26%. Republican peak: R+35 in 1924.
Key facts
- 2024 presidential margin
- R+26MIT Election Lab
- Political archetype
- Republican loyalistAkashic typology
- Population
- 30,9492024 5-year
- Median household income
- $89,4122024 5-year
- White (non-Hispanic)
- 93.5%2024 5-year
- Black
- 0.6%2024 5-year
- Hispanic / Latino
- 3.2%2024 5-year
- Peak Democratic margin
- D+31 in 1964MIT Election Lab
- Peak Republican margin
- R+35 in 1924MIT Election Lab
Constituent county margins for State House District 21, IAOne cell per constituent county, colored by 2024 presidential margin from deep red (Republican) through neutral to deep blue (Democratic), ordered bluest first.
R+60D+60
One cell per constituent county. Ordered by 2024 D-vs-R margin (bluest first). Hover for county-level numbers.
38 presidential elections
| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| R | 6,653 | 11,455 | 18,445 | ||
| R | 6,675 | 10,614 | 17,668 | ||
| R | 5,636 | 8,966 | 15,941 | ||
| R | 7,063 | 7,950 | 15,299 | ||
| R | 6,941 | 7,431 | 14,645 | ||
| R | 6,085 | 7,657 | 13,844 | ||
| R | 5,372 | 6,194 | 11,854 | ||
| D | 5,289 | 4,476 | 10,612 | ||
| D | 4,960 | 4,594 | 11,402 | ||
| D | 5,766 | 4,235 | 10,068 | ||
| R | 5,025 | 5,349 | 10,440 | ||
| R | 4,180 | 4,819 | 10,002 | ||
| D | 4,800 | 3,965 | 8,963 | ||
| R | 3,363 | 4,784 | 8,365 | ||
| R | 3,152 | 3,890 | 7,598 | ||
| D | 4,916 | 2,580 | 7,517 | ||
| R | 2,948 | 4,536 | 7,489 | ||
| R | 3,022 | 4,128 | 7,163 | ||
| R | 2,723 | 4,413 | 7,206 | ||
| D | 3,221 | 2,778 | 6,172 | ||
| D | 3,179 | 3,096 | 6,326 | ||
| R | 3,549 | 3,650 | 7,241 | ||
| D | 3,558 | 3,270 | 6,966 | ||
| D | 3,474 | 2,535 | 6,145 | ||
| R | 2,090 | 3,895 | 6,052 | ||
| R | 1,202 | 3,311 | 6,072 | ||
| R | 1,948 | 3,669 | 5,770 | ||
| D | 1,659 | 1,573 | 3,319 | ||
| D | 1,217 | 888 | 3,127 | ||
| R | 1,451 | 1,779 | 3,399 | ||
| R | 1,116 | 2,022 | 3,389 | ||
| R | 1,603 | 2,021 | 3,744 | ||
| R | 1,783 | 1,905 | 3,744 | ||
| R | 1,326 | 1,620 | 3,244 | ||
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Demographics
Race, ethnicity, and ancestry
Click any group to see the ancestries typically reported within it.
German
28.0%
Irish
14.4%
English
13.8%
American
4.9%
Italian
3.2%
French
1.8%
Scottish
1.6%
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: 39.2 in this county, 39.1 nationally
Male
Age
Female
85+
75–84
65–74
55–64
45–54
35–44
25–34
18–24
5–17
<5
Source · American Community Survey 5-year estimates, 2024 release.
Median household income
2024 inflation-adjusted dollars
$89,412
State House District 21 ranks near the middle of US counties.
State House District 21$89,412
Iowa$75,059
United States$80,734
Source · American Community Survey 5-year estimates, 2024 release.
Poverty rate
All persons below federal poverty line
6.1%
Child poverty is below the national average.
Children under 184.3%
Working age (18–64)6.5%
Seniors (65+)9.1%
Source · American Community Survey 5-year estimates, 2024 release.
Language at home
Population aged 5 and older
97.0%
speak English only
Spanish1.8%
Other Indo-European0.8%
Asian & Pacific Islander0.5%
Source · ACS 5-year estimates, 2024.
Religious adherents
Adherents per capita by tradition
Source · 2020 US Religion Census. Remaining 60.3% of residents not counted as adherents by any reporting body.
With a 2024 presidential margin exceeding 33 points, this rural Iowa district ranks among the state's most one-sided, reflecting the broader rural realignment that has reshaped Iowa's electoral map over the past decade.
The Republican margin in Iowa 21st State House District reached its widest at thirty-five points in 1924. The margin in 2024 was twenty-six points, in line with the district's deep historical pattern.
Its loyalty is rooted in its place. Median household income of $89,412, a 94% non-Hispanic-white share, and a population of 30,949 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 House District 21, Iowa. Akashic. https://akashic.app/sld-lower/19021/. Accessed May 20, 2026. License: CC BY 4.0.
License: CC BY 4.0
Frequently asked questions
How did State House District 21, Iowa vote in 2024?
In 2024, State House District 21, Iowa voted Republican by 26.0 points (R+26), carried by the Republican candidate. Out of 18,445 votes cast, 6,653 went Democratic and 11,455 went Republican.
What is State House District 21, Iowa's political archetype?
Akashic classifies State House District 21, Iowa as a "Republican loyalist" district based on its long-arc presidential voting pattern. Across 38 elections in the dataset, the district has voted Democratic 11 times, Republican 23 times, and other 0 times.
When did State House District 21, Iowa last vote Democratic?
The most recent presidential election in which State House District 21, Iowa voted Democratic was 1996.
How many people live in State House District 21, Iowa?
State House District 21, Iowa has a population of 30,949 according to the 2024 American Community Survey 5-year estimates from the US Census Bureau.
What is the median household income in State House District 21, Iowa?
Median household income in State House District 21, Iowa is $89,412 — above the national median of $80,734. The Iowa state median is $75,059.
What is the political history of State House District 21, Iowa?
Akashic tracks 38 presidential elections in State House District 21, Iowa from 1876 to 2024. Of those, 11 went Democratic and 23 went Republican. The district's archetype — "Republican loyalist" — captures the overall trajectory of that voting record.