Plymouth County, Iowa: Republican loyalist county. In 2024, voted R+54%. Republican peak: R+54 in 2024.
Key facts
- 2024 presidential margin
- R+54MIT Election Lab
- Political archetype
- Republican loyalistAkashic typology
- Population
- 25,7472024 5-year
- Median household income
- $83,2512024 5-year
- White (non-Hispanic)
- 89.4%2024 5-year
- Black
- 2.4%2024 5-year
- Hispanic / Latino
- 6.4%2024 5-year
- Peak Democratic margin
- D+44 in 1932MIT Election Lab
- Peak Republican margin
- R+54 in 1920MIT Election Lab
- Most similar
- Osceola County, IA · similarity 1.00
2024 results by precinct
2024 precinct map of Plymouth CountyPrecinct-level 2024 presidential results for Plymouth County, with each precinct boundary colored by Democratic-vs-Republican margin.
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Margin—
Turnout—
Harris +50Trump +50
Real precinct boundaries. Hover for vote totals.
38 presidential elections
| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| R | 3,104 | 10,661 | 13,971 | ||
| R | 3,494 | 10,492 | 14,188 | ||
| R | 2,885 | 9,680 | 13,274 | ||
| R | 4,164 | 8,597 | 12,950 | ||
| R | 4,629 | 7,765 | 12,512 | ||
| R | 4,278 | 7,810 | 12,222 | ||
| R | 3,499 | 6,189 | 10,118 | ||
| R | 3,745 | 5,117 | 9,956 | ||
| R | 3,171 | 5,196 | 10,484 | ||
| R | 4,220 | 5,316 | 9,607 | ||
| R | 3,464 | 6,482 | 10,027 | ||
| R | 2,965 | 6,515 | 10,346 | ||
| R | 4,284 | 5,590 | 10,016 | ||
| R | 4,033 | 6,339 | 10,466 | ||
| R | 3,234 | 6,236 | 10,037 | ||
| D | 5,691 | 4,920 | 10,613 | ||
| R | 4,671 | 6,432 | 11,103 | ||
| R | 3,502 | 7,246 | 10,748 | ||
| R | 2,768 | 8,140 | 10,957 | ||
| R | 4,339 | 5,002 | 9,416 | ||
| R | 2,970 | 6,085 | 9,076 | ||
| R | 3,831 | 7,725 | 11,579 | ||
| D | 5,994 | 4,133 | 11,445 | ||
| D | 7,565 | 2,888 | 10,563 | ||
| D | 5,015 | 4,848 | 9,897 | ||
| R | 1,605 | 3,803 | 9,036 | ||
| R | 1,801 | 6,090 | 7,996 | ||
| R | 2,258 | 2,666 | 5,017 | ||
| O | 2,038 | 825 | 4,942 | ||
| R | 2,168 | 2,622 | 4,930 | ||
| R | 1,663 | 2,905 | 4,726 | ||
| R | 2,307 | 2,712 | 5,114 | ||
| R | 2,392 | 2,623 | 5,103 | ||
| D | 2,244 | 1,672 | 4,169 | ||
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Demographics
Race, ethnicity, and ancestry
Click any group to see the ancestries typically reported within it.
German
39.0%
Irish
12.1%
American
6.7%
English
6.3%
French
1.7%
Polish
1.0%
Italian
0.9%
African American
1.9%
Multiple ancestry combinations reported; no single grouping above 1%.
Sample size too small to break out by ancestry reliably.
American Indian, Alaska Native, Native Hawaiian, and Pacific Islander combined.
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: 41.3 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
$83,251
Plymouth County ranks in the top 25% of US counties.
Plymouth County$83,251
Iowa$75,059
United States$80,734
Source · American Community Survey 5-year estimates, 2024 release.
Poverty rate
All persons below federal poverty line
6.9%
Child poverty is below the national average.
Children under 188.8%
Working age (18–64)5.3%
Seniors (65+)15.2%
Source · American Community Survey 5-year estimates, 2024 release.
Language at home
Population aged 5 and older
93.1%
speak English only
Spanish4.3%
Other languages1.5%
Asian & Pacific Islander0.7%
Other Indo-European0.5%
Source · ACS 5-year estimates, 2024.
Religious adherents
Adherents per capita by tradition
Source · 2020 US Religion Census. Remaining 38.9% of residents not counted as adherents by any reporting body.
Plymouth County in northwest Iowa delivered a 54-point Republican presidential margin in 2024, reflecting the heavily rural, agricultural character of a region where small-town and farm households dominate the electorate.
The Republican margin in Plymouth County reached its widest at fifty-four points in 2024. The margin in 2024 was fifty-four points, in line with the county's deep historical pattern.
Its loyalty is rooted in its place. Median household income of $83,251, a 89% non-Hispanic-white share, and a population of 25,747 together describe a community whose political habits are deeply settled. The county's voting pattern over the last decade is most similar to that of Osceola County and McKenzie County.
Most similar counties
Cite this page
All citations released under CC BY 4.0. Attribution: Akashic Intelligence.
Plymouth County, Iowa — The Long Memory. Akashic Intelligence — The Long Memory. https://akashic.app/county/19149/. Accessed May 20, 2026. License: CC BY 4.0.
License: CC BY 4.0
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Frequently asked questions
How did Plymouth County, Iowa vote in 2024?
In 2024, Plymouth County, Iowa voted Republican by 54.1 points (R+54), carried by the Republican candidate. Out of 13,971 votes cast, 3,104 went Democratic and 10,661 went Republican.
What is Plymouth County, Iowa's political archetype?
Akashic classifies Plymouth County, Iowa as a "Republican loyalist" county based on its long-arc presidential voting pattern. Across 38 elections in the dataset, the county has voted Democratic 5 times, Republican 28 times, and other 1 times.
When did Plymouth County, Iowa last vote Democratic?
The most recent presidential election in which Plymouth County, Iowa voted Democratic was 1964.
How many people live in Plymouth County, Iowa?
Plymouth County, Iowa has a population of 25,747 according to the 2024 American Community Survey 5-year estimates from the US Census Bureau.
What is the median household income in Plymouth County, Iowa?
Median household income in Plymouth County, Iowa is $83,251 — above the national median of $80,734. The Iowa state median is $75,059.
What is the political history of Plymouth County, Iowa?
Akashic tracks 38 presidential elections in Plymouth County, Iowa from 1876 to 2024. Of those, 5 went Democratic and 28 went Republican. The county's archetype — "Republican loyalist" — captures the overall trajectory of that voting record.