akashic
1876–2024
State Senate District 21·Iowa

Iowa 21st State Senate District has voted Democratic in eleven straight presidential cycles.

One of Iowa's most reliably Republican legislative districts

1876 — 2024·38 elections
IA
Latest
D+11
in 2024
Archetype
Democratic loyalist
since the recent cycles
Population
26,031
2024 ACS

Iowa 21st State Senate District, Iowa: Democratic loyalist district. In 2024, voted D+11%. Republican peak: R+57 in 1904.

Key facts

2024 presidential margin
D+11MIT Election Lab
Political archetype
Democratic loyalistAkashic typology
Population
26,0312024 5-year
Median household income
$83,5762024 5-year
White (non-Hispanic)
75.8%2024 5-year
Black
7.4%2024 5-year
Hispanic / Latino
10.4%2024 5-year
Peak Democratic margin
D+33 in 1964MIT Election Lab
Peak Republican margin
R+57 in 1904MIT Election Lab
2024 results by constituent county
1 counties · 1 D · 0 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
D
+10.8%
7,2475,80713,287
D
+15.2%
7,5665,52513,386
D
+11.3%
6,1984,83712,074
D
+14.1%
6,6464,97111,841
D
+14.6%
6,2594,63911,091
D
+4.6%
5,4434,95810,482
D
+5.6%
4,6414,1359,010
D
+14.7%
4,3393,1508,076
D
+8.9%
4,0653,2968,653
D
+18.6%
4,3702,9937,405
D
+2.7%
3,9013,6947,649
R
−1.5%
3,2073,3197,437
D
+7.0%
3,7213,2247,127
R
−8.3%
3,0613,6346,863
D
+0.8%
2,7282,6815,938
D
+33.0%
3,8381,9295,792
R
−7.5%
2,8503,3156,168
R
−8.1%
2,7433,2285,975
R
−8.9%
2,6323,1525,835
D
+14.2%
2,3431,7464,210
D
+11.3%
2,3831,8954,300
D
+11.2%
2,6722,1344,821
D
+13.1%
2,2901,7504,111
R
−3.7%
1,6301,7603,553
R
−36.1%
1,0202,1883,234
R
−51.2%
3451,9403,118
R
−36.7%
8421,8662,793
D
+4.2%
6385841,276
O
+11.4%
3742411,168
R
−21.4%
4106501,120
R
−56.6%
1607301,007
R
−33.0%
3206531,009
R
−21.9%
367576956
R
−15.3%
287401746
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Demographics

Race, ethnicity, and ancestry
Click any group to see the ancestries typically reported within it.
German
24.5%
Irish
13.3%
English
11.8%
American
3.3%
Italian
3.2%
Scottish
2.0%
French
1.4%
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: 36.2 in this county, 39.1 nationally
Male
Age
Female
0.6%
85+
0.9%
1.6%
75–84
2.3%
4.0%
65–74
4.5%
5.6%
55–64
5.8%
6.1%
45–54
5.9%
7.3%
35–44
6.9%
7.7%
25–34
7.5%
4.4%
18–24
4.4%
9.1%
5–17
8.8%
3.3%
<5
3.2%
Source · American Community Survey 5-year estimates, 2024 release.
Median household income
2024 inflation-adjusted dollars
$83,576
State Senate District 21 ranks near the middle of US counties.
State Senate District 21$83,576
Iowa$75,059
United States$80,734
Source · American Community Survey 5-year estimates, 2024 release.
Poverty rate
All persons below federal poverty line
10.3%
Child poverty is below the national average.
Children under 1814.0%
Working age (18–64)9.3%
Seniors (65+)7.1%
Source · American Community Survey 5-year estimates, 2024 release.
Language at home
Population aged 5 and older
85.3%
speak English only
Spanish7.0%
Asian & Pacific Islander3.3%
Other Indo-European2.4%
Other languages2.0%
Source · ACS 5-year estimates, 2024.
Religious adherents
Adherents per capita by tradition
Catholic & Orthodox
13.6%
Mainline Protestant
7.9%
Other Christian
6.4%
Methodist
3.5%
Pentecostal & Holiness
3.1%
Baptist
2.2%
Non-Christian
2.0%
Source · 2020 US Religion Census. Remaining 61.3% of residents not counted as adherents by any reporting body.

With a 2024 presidential margin of R+33.2, this rural Iowa district ranks among the state's most one-sided, reflecting the broader realignment of small-town and agricultural communities toward Republican candidates over the past decade.

The Democratic margin in Iowa 21st State Senate District reached its widest at thirty-three points in 1964. The margin in 2024 was eleven points — still decisive.

Its loyalty is rooted in its place. Median household income of $83,576, a 76% non-Hispanic-white share, and a population of 26,031 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, Iowa. Akashic. https://akashic.app/sld-upper/19021/. Accessed May 20, 2026. License: CC BY 4.0.
License: CC BY 4.0

Frequently asked questions

How did State Senate District 21, Iowa vote in 2024?
In 2024, State Senate District 21, Iowa voted Democratic by 10.8 points (D+11), carried by the Democratic candidate. Out of 13,287 votes cast, 7,247 went Democratic and 5,807 went Republican.
What is State Senate District 21, Iowa's political archetype?
Akashic classifies State Senate District 21, Iowa as a "Democratic loyalist" district based on its long-arc presidential voting pattern. Across 38 elections in the dataset, the district has voted Democratic 19 times, Republican 14 times, and other 1 times.
When did State Senate District 21, Iowa last vote Republican?
The most recent presidential election in which State Senate District 21, Iowa voted Republican was 1980.
How many people live in State Senate District 21, Iowa?
State Senate District 21, Iowa has a population of 26,031 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, Iowa?
Median household income in State Senate District 21, Iowa is $83,576 — above the national median of $80,734. The Iowa state median is $75,059.
What is the political history of State Senate District 21, Iowa?
Akashic tracks 38 presidential elections in State Senate District 21, Iowa from 1876 to 2024. Of those, 19 went Democratic and 14 went Republican. The district's archetype — "Democratic loyalist" — captures the overall trajectory of that voting record.