Population
25,697
2025
+0.0% since 2020
Source: U.S. Census Bureau, Population Estimates Program (Vintage 2025), 2025. Resident population, July 1 estimate.
Plymouth County, IA: population growth, jobs and income
Plymouth County gained 13 residents between 2024 and 2025 (+0.1%).
Plymouth County had an estimated 25,697 residents in 2025, up 0.0% (0 more people) since 2020. That is slower than Iowa as a whole (+1.5%), and the 35th fastest growth of 99 counties in Iowa.
Data as of 2025 · updated
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In the Plymouth County report
One-time $99 PDF: everything on this page for Plymouth County, ranked against Iowa and the U.S., plus these figures that are not on the free page:
- Median gross rent$910/mo2020–24
- Vacant homes, incl. seasonal and second homes5.3%2020–24
- New homes permitted, last 12 months1252025-10/2026-09
- Rent growth, 5 yearsIn the report
- Permits in 5+ unit buildingsIn the report
- IRS income moving in (net AGI)In the report
- Neighbouring-county comparison tableIn the report
What's inside: 5 pages
- 1 Summary, headline numbers and ranks (free preview)
- 2 Ranks and the neighbouring-county table
- 3 Migration, with IRS mover and income flows
- 4 Rent, vacant homes, permits and employers
- 5 Every source and the methods
Headline numbers
Net domestic migration
+7
2025
0.3 per 1,000 residents
−295 in total, 2021–2025
Source: U.S. Census Bureau, Population Estimates Program (Vintage 2025), 2025. People moving in from other U.S. counties minus people moving out.
Unemployment rate
2.6%
2025
+0.3 pts since 2019
Source: U.S. Bureau of Labor Statistics, Local Area Unemployment Statistics, 2025. Annual average unemployment rate.
New homes permitted
45
2025
+0.0% since 2021
1.8 per 1,000 residents
Source: U.S. Census Bureau, Building Permits Survey, 2025. Housing units authorized by building permits in the year.
Median household income
$83,251
2020–24
+17.0% since 2016–20
Source: U.S. Census Bureau, American Community Survey 5-year estimates, 2020–24. American Community Survey 5-year estimate.
Private-sector employment
10,405
2023
+2.8% since 2018
Source: U.S. Census Bureau, County Business Patterns, 2023. Paid employees of private employers in mid-March (County Business Patterns).
What the numbers say
Net domestic migration added 7 people in 2025: more people moved in from other U.S. counties than moved out.
Private employers had 10,405 paid employees in mid-March 2023, +2.8% since 2018 (County Business Patterns).
Unemployment averaged 2.6% in 2025, 0.3 points higher than in 2019 (before the pandemic).
Builders were authorized to start 45 new homes in 2025, or 1.8 per 1,000 residents.
Median household income was $83,251 in the 2020–24 American Community Survey, +17.0% since 2016–20.
Across the 3,107 U.S. counties with a comparable estimate, its population growth ranks 1,871st.
Part of the Le Mars, IA micro area.
Get Plymouth County’s next numbers by email
Email me when Plymouth County gets new Census numbers: population, building permits, jobs and income. About 4 emails a year, one click to stop.
Plymouth County population by year
| Year | Population | Change |
|---|---|---|
| 2025 | 25,697 | +13 |
| 2024 | 25,684 | −39 |
| 2023 | 25,723 | +10 |
| 2022 | 25,713 | −31 |
| 2021 | 25,744 | +47 |
| 2020 | 25,697 | – |
Census Bureau population estimates, July 1 of each year.
What drove the change in Plymouth County
Plymouth County grew by 0 people since 2020; the largest part came from international migration (+236).
| Component | 2025 | 2020–25 | Share |
|---|---|---|---|
| Natural changebirths minus deaths | −3 | +57 | |
| International migrationfrom and to other countries | +10 | +236 | |
| Domestic migrationfrom and to other U.S. counties | +7 | −295 | |
| Census adjustmentbalancing residual | −1 | +2 | |
| Total change | +13 | +0 |
Census Bureau population estimates, components of change, each year July 1 to June 30. The components add up to the change in the estimate; the Census adjustment is the small balancing figure the Bureau publishes.
How it ranks
| Measure | In Iowa | Among U.S. counties |
|---|---|---|
| Population growth | 35th of 99 | 1,871st of 3,107 |
| Net domestic migration per 1,000 residents | 43rd of 99 | 1,873rd of 3,108 |
| Private-sector job growth | 31st of 99 | 1,490th of 3,092 |
| Median household income | 11th of 99 | 475th of 3,107 |
| Lowest unemployment rate | 8th of 99 | 158th of 3,108 |
| New homes permitted per 1,000 residents | 46th of 99 | 1,665th of 3,005 |
1st = highest (lowest for unemployment). Counties are ranked only against others with a figure for the same period.
Get the county report — $99
The County Growth and Demographics Report for Plymouth County, IA as a PDF, from federal data: population and migration, housing and rents, permits, private employers and jobs, unemployment, ranks in the state and the country, and neighbouring counties, with a source next to every number. Pay once, no subscription.
Add 2 neighbouring counties for $50: the Woodbury County and Sioux County reports too, $149 for all 3.
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Neighbouring counties
Over 2020–25, Plymouth County's population change (+0.0%) was ahead of 1 of its 5 neighbouring counties and behind 4.
2 of its 5 neighbouring counties had a higher median household income than Plymouth County's $83,251 (2020–24).
| County | Population2025 | Population change2020–25 | Net domestic migration per 1,000 residents2025 | Homes permitted per 1,000 residents2025 | Median household income2020–24 |
|---|---|---|---|---|---|
| Plymouth County, IA This county | 25,697 | +0.0% | 0.3 | 1.8 | $83,251 |
| Sioux County, IA | 36,774 | +2.5% | −6.1 | 9.8 | $86,098 |
| Woodbury County, IA | 106,649 | +0.7% | −6.9 | 2.2 | $73,658 |
| Union County, SD | 17,402 | +3.2% | −6.6 | 15.9 | $89,636 |
| Cherokee County, IA | 11,369 | −2.4% | −7.2 | 4.9 | $71,269 |
| O'Brien County, IA | 14,220 | +0.5% | 0.6 | 1.3 | $68,356 |
Census Bureau population estimates and building permits, American Community Survey 5-year income. Rates per 1,000 residents. – means no figure, or a base too small for a change or rate (it would swing on a few people). A figure from another period shows its year and is left out of the comparison.
Questions
Is Plymouth County growing?
Its population was about flat between 2020 and 2025 (+0.0%; Census Bureau population estimates). Iowa as a whole changed +1.5% over the same years. That ranks 35th of 99 counties in Iowa for population growth.
How many people moved to Plymouth County?
On net, about 7 people in 2025: that many more moved in from other U.S. counties than moved out (Census Bureau net domestic migration estimate).
What is the unemployment rate in Plymouth County?
It averaged 2.6% in 2025 (BLS Local Area Unemployment Statistics, annual average).
What is the population of Plymouth County?
About 25,697 people, according to the U.S. Census Bureau's population estimate for July 1, 2025.
How many jobs are in Plymouth County?
Private employers there had 10,405 paid employees in mid-March 2023, +2.8% since 2018 (Census Bureau County Business Patterns; government jobs and the self-employed are not counted).
What Beacon CRE covers in Iowa
Map, parcel and listing layers cover North and South Carolina only for now. This page and the other Iowa county pages carry the public federal growth figures.
Plymouth County data alerts
Email me when Plymouth County gets new Census numbers: population, building permits, jobs and income. About 4 emails a year, one click to stop.
Sources and method
- U.S. Census Bureau, Population Estimates Program (Vintage 2025)
- U.S. Bureau of Labor Statistics, Local Area Unemployment Statistics
- U.S. Census Bureau, Building Permits Survey
- U.S. Census Bureau, American Community Survey 5-year estimates
- U.S. Census Bureau, County Business Patterns
Each number shows its own period. Changes compare the latest period with five years earlier (or the earliest period available). Beacon CRE last refreshed these figures on 2026-11-05. Figures come from public federal statistics and are informational only, not investment advice. Check the source before relying on a number. Methodology: how we compute every number. More on every layer: data sources and licences.
Jobs outside North and South Carolina use County Business Patterns (paid private-sector employees in mid-March); wages and government jobs are not included.