County · Iowa
Plymouth County, Iowa
Plymouth County, Iowa. Plymouth County had 25,697 residents in 2025 by the Census Bureau's estimate, about level with 2020, slower than Iowa (+1.5%). It holds 12 places (12 cities, villages and boroughs) and 6 census tracts. GEOID 19149.
Plymouth County is the county of the Le Mars, IA micropolitan statistical area (the Census Bureau's July 2023 delineation).
Residents, July 2025 estimate
25,697
Census Bureau estimate (no margin published)
2020 Census count: 25,698 · ACS 2020-2024: 25,747
Median household income
$83,251
±$4,100 (90% margin)
Iowa: $75,059
Median home value
$228,900
±$9,640 (90% margin)
Iowa: $208,000
Median gross rent
$910
±$59 (90% margin)
Iowa: $972
How many people live in Plymouth County, and is it growing?
The 2020 Census counted 25,698 residents in Plymouth County. The Census Bureau estimates 25,697 for July 1, 2025, about level with 2020, slower than Iowa (+1.5%). The 2020-2024 American Community Survey puts the population at 25,747 over 863 square miles of land.
| Measure | Plymouth County | Iowa | Change since 2015-2019 |
|---|---|---|---|
| Total population | 25,747 | 3,210,507 | +679 |
| Households | 10,313±187 | 1,315,707 | no clear change |
| Average household size | 2.46±0.04 | 2.36 | no clear change |
| Housing units | 10,891±43 | 1,437,699 | no clear change |
Plymouth County's population since 2000
From 24,849 in 2000 to 25,697 in 2025: up 3.4%. The 2000, 2010 and 2020 figures are census counts. The 2005 figure is the Census Bureau's intercensal estimate, revised to fit the 2000 and 2010 counts and drawn on 2010 boundaries; 2015 and 2025 are July 1 estimates made from the census before them.
Source: The 2000, 2010 and 2020 Census counts and the Census Bureau's population estimates (intercensal 2000-2010, Vintage 2020, Vintage 2025) · Census population estimates
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); PEP Vintage 2025 (CO-EST2025); 2020 Census · Check it at data.census.gov
What cities and towns are in Plymouth County?
Plymouth County holds 12 places: 12 cities, villages and boroughs (incorporated places). The largest is Le Mars with 10,760 residents (2025 estimate). Places that cross a county line are listed with the share of their 2020 residents who live in this county.
| Le Mars | 10,571 | $74,701 |
|---|---|---|
| Remsen | 1,678 | $91,477 |
| Akron | 1,558 | $66,250 |
| Kingsley | 1,396 | $72,841 |
| Hinton | 935 | $114,531 |
| Merrill | 717 | $82,969 |
| Brunsville | 129 | $45,000 |
| WestfieldGEOID 1984090 | 123 | $68,125 |
| OyensGEOID 1960780 | 92 | $100,625 |
| CraigGEOID 1916950 | 79 | $50,000 |
| StrubleGEOID 1975945 | 67 | $59,375 |
| Sioux City | 85,797 | $68,906 |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); 2020 place-by-county parts · Check it at data.census.gov
Who lives in Plymouth County?
The median resident of Plymouth County is 41.3 years old; 25.0% are under 18 and 19.8% are 65 or older. The largest group is non-Hispanic white residents at 88.0%, then Hispanic or Latino residents (of any race) at 6.4%. 3.7% of residents were born outside the United States.
| Measure | Plymouth County | Iowa | Change since 2015-2019 |
|---|---|---|---|
| Median age | 41.3±0.7 | 38.6 | +1.3 |
| Under 18 years | 25.0%±0.2 pts | 22.9% | – |
| 65 years and over | 19.8%±0.5 pts | 18.1% | – |
| Hispanic or Latino (any race) | 6.4% | 7.3% | +1.2 pts |
| White alone, not Hispanic | 88.0%±0.3 pts | 82.3% | −3.7 pts |
| Black or African American alone, not Hispanic | 2.4%±0.2 pts | 3.8% | +1.5 pts |
| Asian alone, not Hispanic | 0.5%±0.1 pts | 2.5% | no clear change |
| American Indian and Alaska Native alone, not Hispanic | 0.2%±0.1 pts | 0.2% | – |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.4%±0.3 pts | 0.2% | – |
| Two or more races, not Hispanic | 2.0%±0.5 pts | 3.5% | – |
| Some other race alone, not Hispanic | 0.0%±0.1 pts | 0.3% | – |
| Born outside the United States | 3.7%±0.9 pts | 5.9% | no clear change |
| Speak a language other than English at home (age 5+) | 6.9%±1.2 pts | 9.1% | – |
| Civilian veterans (age 18+) | 6.9%±0.9 pts | 6.5% | – |
| With a disability | 11.5%±1.5 pts | 12.6% | – |
| No health insurance coverage | 5.3%±1.6 pts | 5.0% | no clear change |
| High school graduate or higher (age 25+) | 94.8%±0.9 pts | 93.3% | – |
| Bachelor's degree or higher (age 25+) | 21.7%±2.1 pts | 31.4% | no clear change |
| Graduate or professional degree (age 25+) | 5.0%±0.8 pts | 10.5% | – |
| Moved from another state in the past year | 1.8%±0.7 pts | 2.2% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profiles DP02, DP05) · Check it at data.census.gov
What do households in Plymouth County earn?
Half of Plymouth County's 10,313 households earn less than $83,251 a year (±$4,100), against $75,059 in Iowa. In 2015-2019 it was $82,822 in 2024 dollars; the margins of error cannot tell the two periods apart. 6.9% of residents live below the poverty line.
| Measure | Plymouth County | Iowa | Change since 2015-2019 |
|---|---|---|---|
| Median household income | $83,251±$4,100 | $75,059 | no clear change |
| Mean household income | $101,116±$4,760 | $98,187 | – |
| Per capita income | $41,532±$1,940 | $40,877 | no clear change |
| People below the poverty line | 6.9%±1.5 pts | 11.1% | no clear change |
| Children under 18 below the poverty line | 8.8%±3.4 pts | 12.9% | −6.0 pts |
| Households receiving SNAP | 6.6%±1.5 pts | 8.8% | – |
| Households with a broadband subscription | 89.8%±2.2 pts | 88.9% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov
What does housing cost in Plymouth County?
Owners occupy 73.6% of Plymouth County's occupied homes and renters 26.4%. The median owner-occupied home is valued at $228,900 by its owner (±$9,640). The median renter pays $910 a month including utilities, and 20.6% of renters pay 35% or more of their income on rent.
| Measure | Plymouth County | Iowa | Change since 2015-2019 |
|---|---|---|---|
| Median home value (owner-occupied) | $228,900±$9,640 | $208,000 | +$27,682 |
| Median gross rent | $910±$59 | $972 | +$98 |
| Renters paying 35% or more of income on rent | 20.6%±5.3 pts | 35.2% | no clear change |
| Median monthly owner costs, with a mortgage | $1,426±$55 | $1,533 | – |
| Owner-occupied homes | 73.6%±2.9 pts | 71.7% | −3.9 pts |
| Housing units | 10,891±43 | 1,437,699 | no clear change |
| Homeowner vacancy rate | 0.7%±0.6 pts | 0.8% | – |
| Rental vacancy rate | 3.3%±3.7 pts | 5.7% | – |
| Single-family detached homes | 78.9%±2.1 pts | 72.2% | – |
| Mobile homes | 3.8%±1.2 pts | 3.2% | – |
| Built 2020 or later | 1.2%±0.8 pts | 1.7% | – |
| Built 1939 or earlier | 24.5%±2.3 pts | 23.5% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP04) · Check it at data.census.gov
How many new homes is Plymouth County building?
Builders took permits for 45 new housing units across Plymouth County in 2025 (45 single-family), 1.8 per 1,000 residents.
Source: Building Permits Survey, annual county files 2019-2025, U.S. Census Bureau · Census Building Permits Survey
How do people in Plymouth County get to work?
79.1% of Plymouth County's workers drive alone and 9.2% work from home. The average trip to work takes 19.2 minutes. The unemployment rate in 2020-2024 averaged 2.2%.
| Measure | Plymouth County | Iowa | Change since 2015-2019 |
|---|---|---|---|
| In the labor force (age 16+) | 68.9%±2.0 pts | 66.4% | – |
| Unemployment rate | 2.2%±1.0 pts | 3.6% | no clear change |
| Drove alone to work | 79.1%±2.7 pts | 76.0% | – |
| Carpooled | 9.2%±2.0 pts | 7.8% | – |
| Public transportation | 0.6%±0.5 pts | 0.7% | – |
| Walked | 1.1%±0.5 pts | 2.9% | – |
| Worked from home | 9.2%±1.9 pts | 11.3% | +2.9 pts |
| Mean travel time to work | 19.2 min±1.2 | 19.8 min | no clear change |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov
What are Plymouth County's census tracts?
Plymouth County is divided into 6 census tracts. Among those with a reliable estimate, median household income runs from $71,983 (Tract 9701) to $112,815 (Tract 9706).
| Tract 970119149970100 | 6,958±310 | $71,983 |
|---|---|---|
| Tract 970219149970200 | 4,054±322 | $76,656 |
| Tract 970319149970300 | 3,269±370 | $75,913 |
| Tract 970419149970400 | 3,033±248 | $91,563 |
| Tract 970519149970500 | 3,140±246 | $85,769 |
| Tract 970619149970600 | 5,293±340 | $112,815 |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) · Check it at data.census.gov
How does Plymouth County compare with Iowa's other counties?
| Measure | Rank |
|---|---|
| Population | 24th of 99 |
| Growth 2020-2025 | 34th of 99 |
| Residents per square mile | 41st of 99 |
| Median household income | 11th of 99 |
| Median home value | 14th of 99 |
| Median gross rent | 19th of 99 |
| Poverty rate | 93rd of 99 |
| Bachelor's degree or higher | 60th of 99 |
| Median age | 63rd of 99 |
Source: PlainCities ranks from the American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) and PEP Vintage 2025 · How ranks are computed
How these figures are made: methodology and release checks · reading a margin of error · every state · corrections
Not on this page: crime, weather and schools for Plymouth County are other agencies' records. Crime: the FBI's Crime Data Explorer · climate: NOAA's U.S. Climate Normals · schools: the National Center for Education Statistics' school search.