Iowa 31st State Senate District, Iowa: Tossup district. In 2024, voted D+1%. Republican peak: R+58 in 1920.
Key facts
- 2024 presidential margin
- D+1MIT Election Lab
- Political archetype
- TossupAkashic typology
- Population
- 12,6632024 5-year
- Median household income
- $66,4172024 5-year
- White (non-Hispanic)
- 79.5%2024 5-year
- Black
- 9.3%2024 5-year
- Hispanic / Latino
- 5.2%2024 5-year
- Peak Democratic margin
- D+22 in 1964MIT Election Lab
- Peak Republican margin
- R+58 in 1920MIT Election Lab
Constituent county margins for State Senate District 31, 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 |
|---|---|---|---|---|---|
| D | 3,024 | 2,954 | 6,078 | ||
| D | 3,444 | 2,864 | 6,435 | ||
| D | 3,115 | 2,655 | 6,281 | ||
| D | 3,848 | 2,535 | 6,488 | ||
| D | 3,786 | 2,383 | 6,259 | ||
| D | 3,420 | 2,710 | 6,175 | ||
| D | 2,910 | 2,268 | 5,323 | ||
| D | 2,865 | 1,867 | 5,132 | ||
| D | 2,859 | 2,068 | 5,947 | ||
| D | 3,059 | 2,330 | 5,428 | ||
| R | 3,041 | 3,117 | 6,207 | ||
| R | 2,652 | 2,863 | 6,157 | ||
| R | 2,851 | 2,995 | 5,963 | ||
| R | 2,099 | 2,989 | 5,197 | ||
| R | 2,039 | 2,473 | 4,788 | ||
| D | 2,968 | 1,908 | 4,881 | ||
| R | 2,327 | 2,748 | 5,078 | ||
| R | 1,971 | 2,730 | 4,708 | ||
| R | 1,677 | 2,770 | 4,467 | ||
| D | 1,894 | 1,550 | 3,501 | ||
| D | 1,603 | 1,516 | 3,134 | ||
| D | 1,672 | 1,655 | 3,337 | ||
| D | 1,623 | 1,321 | 3,061 | ||
| R | 1,417 | 1,425 | 2,876 | ||
| R | 818 | 1,875 | 2,705 | ||
| R | 288 | 1,528 | 2,340 | ||
| R | 387 | 1,635 | 2,136 | ||
| R | 413 | 651 | 1,098 | ||
| O | 358 | 155 | 1,029 | ||
| R | 302 | 525 | 880 | ||
| R | 180 | 506 | 756 | ||
| R | 243 | 484 | 752 | ||
| R | 209 | 449 | 679 | ||
| R | 246 | 337 | 590 | ||
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Demographics
Race, ethnicity, and ancestry
Click any group to see the ancestries typically reported within it.
German
30.2%
Irish
11.3%
English
8.5%
American
4.7%
Italian
1.6%
French
1.6%
Scottish
1.2%
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: 35.7 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
$66,417
State Senate District 31 ranks near the middle of US counties.
State Senate District 31$66,417
Iowa$75,059
United States$80,734
Source · American Community Survey 5-year estimates, 2024 release.
Poverty rate
All persons below federal poverty line
14.9%
Children face moderate poverty.
Children under 1817.2%
Working age (18–64)14.9%
Seniors (65+)8.1%
Source · American Community Survey 5-year estimates, 2024 release.
Language at home
Population aged 5 and older
91.2%
speak English only
Spanish3.3%
Other Indo-European2.9%
Asian & Pacific Islander2.1%
Other languages0.4%
Source · ACS 5-year estimates, 2024.
Religious adherents
Adherents per capita by tradition
Source · 2020 US Religion Census. Remaining 51.0% of residents not counted as adherents by any reporting body.
Iowa Senate District 31 leans heavily Republican in statewide contests, with its largely rural and small-town electorate delivering some of the state's more consistent margins. Demographic shifts here have trended toward consolidating that alignment over the past decade.
The district's recent history is a story of close margins. The Democratic margin reached twenty-two points in 2008; the Republican margin reached fifty-eight points in 1920. Most other elections have been decided by single-digit points.
Its demographics — a population of 12,663, a 80% non-Hispanic-white share, a median household income of $66,417 — situate the district close to national averages on several dimensions.
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 31, Iowa. Akashic. https://akashic.app/sld-upper/19031/. Accessed May 20, 2026. License: CC BY 4.0.
License: CC BY 4.0
Frequently asked questions
How did State Senate District 31, Iowa vote in 2024?
In 2024, State Senate District 31, Iowa voted Democratic by 1.2 points (D+1), carried by the Democratic candidate. Out of 6,078 votes cast, 3,024 went Democratic and 2,954 went Republican.
What is State Senate District 31, Iowa's political archetype?
Akashic classifies State Senate District 31, Iowa as a "Tossup" district based on its long-arc presidential voting pattern. Across 38 elections in the dataset, the district has voted Democratic 15 times, Republican 18 times, and other 1 times.
When did State Senate District 31, Iowa last vote Republican?
The most recent presidential election in which State Senate District 31, Iowa voted Republican was 1984.
How many people live in State Senate District 31, Iowa?
State Senate District 31, Iowa has a population of 12,663 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 31, Iowa?
Median household income in State Senate District 31, Iowa is $66,417 — below the national median of $80,734. The Iowa state median is $75,059.
What is the political history of State Senate District 31, Iowa?
Akashic tracks 38 presidential elections in State Senate District 31, Iowa from 1876 to 2024. Of those, 15 went Democratic and 18 went Republican. The district's archetype — "Tossup" — captures the overall trajectory of that voting record.