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COUNTY

Plymouth County

Iowa · 25,697 residents (2025 est.) · 862.828 sq mi
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The short version

Plymouth County has roughly average household income, with a median household income of $83,251. Population has held roughly steady since 2000. 22% of adults hold a bachelor's degree or higher, below the national rate of 36%. Median home value has more than doubled since 2000, reaching $228,900. It ranks in the top 5% of US counties for household income.

At a glance
Average income
near the US median
US median: $82,259
Older
median age 41.3
US median: 38.9
Less educated
22% hold a bachelor's degree
US average: 36%
Less affordable
home values up 39%, inflation adjusted
US median home: $376,019
Section 01

Population & growth

Total population
25,747
+4%since 2000
from 24,849 in 2000
1990 – 2025
Population density
30 / sq mi
+6%since 2009
from 28 / sq mi in 2009
US average: 281
Median age
41.3
+9%since 2000
from 37.8 in 2000
US average: 38.9

PEP 2025 EST:25,697 residents (Census Bureau Vintage 2025, released March 2026)

Population, 1990 – 2024
23K24K25K25K26K1990201020202024Plymouth County
202426K
1990201020202024
Age distribution, 2024
Under 55.9%(1,515)
US avg: 5.6%
5 to 97.1%(1,826)
US avg: 6%
10 to 147.3%(1,876)
US avg: 6.4%
15 to 196.7%(1,714)
US avg: 6.6%
20 to 245.1%(1,310)
US avg: 6.5%
25 to 3411%(2,833)
US avg: 13.7%
35 to 4412.1%(3,104)
US avg: 13.2%
45 to 5411.7%(3,025)
US avg: 12.2%
55 to 6413.4%(3,448)
US avg: 12.7%
65 to 7411.5%(2,950)
US avg: 10.2%
75 to 845.9%(1,527)
US avg: 5.1%
85 and over2.4%(619)
US avg: 1.9%
BAR + DOT: THIS PLACE · TICK: US AVERAGE
Section 02

Income & economy

Median household income
$83,251
+10%inflation adjusted, since 2000
from $41,638 in 2000
US average: $82,259
1990 – 2024
Per capita income
$41,532
+114%since 2000
from $19,442 in 2000
US average: $44,673
Households earning $100K+
55.7%
+24.2 ptssince 2009
from 31.5% in 2009
US average: 53.3%
Poverty rate
6.9%
+0.9 ptssince 2000
from 6.0% in 2000
US average: 12.5%
Income inequality (Gini)
0.407
−3%since 2010
from 0.420 in 2010
US average: 0.476
Workforce by industry, 2024
Retail trade19.6%
US avg: 9.9%
Information9%
US avg: 10.8%
Finance & insurance8.7%
US avg: 5.9%
Professional, scientific, technical7.4%
US avg: 5.1%
Wholesale trade6.4%
US avg: 6.9%
Agriculture, forestry, fishing6.1%
US avg: 1.6%
Construction5.9%
US avg: 1.2%
Other services4.7%
US avg: 6.7%
Public administration4.3%
US avg: 4.8%
Arts, entertainment, food2%
US avg: 1.9%
Transportation & warehousing2%
US avg: 2.2%
Education & health services1.3%
US avg: 0.9%
Manufacturing0.2%
US avg: 0.4%
BAR + DOT: THIS PLACE · TICK: US AVERAGE
Section 03

Housing

Median home value
$228,900
+39%inflation adjusted, since 2000
from $90,100 in 2000
US average: $376,019
1990 – 2024
Median gross rent
$910
+20%inflation adjusted, since 2000
from $416 in 2000
US average: $1,442
Owner-occupied
73.6%
−3.9 ptssince 2000
from 77.5% in 2000
26.4% rent
Vacancy rate
5.3%
−1.7 ptssince 2009
from 7.0% in 2009
US average: 10.0%
Owner cost-burdened
11.9%
−1.8 ptssince 2009
from 13.7% in 2009
US average: 22.9%
Renter cost-burdened
28.1%
+2.4 ptssince 2009
from 25.7% in 2009
US average: 47.4%
Afford Score
2.7
+26%since 2009
from 2.2 in 2009
2009 – 2024
Our index: median home value divided by median household income. Lower is more affordable.
Gentrification Score
40
Our index, 0 to 100. Higher means faster recent growth in incomes, home values, and college degrees.
RELATED:See current rent listings in Plymouth County on RentDataNow
Section 04

Race & ethnicity

2000
White, non-Hispanic97.4%(24,215)
Black0.3%(67)
Hispanic / Latino1.3%(328)
Asian0.3%(65)
Other0%
2024
White, non-Hispanic88%(22,664)
Black2.4%(615)
Hispanic / Latino6.4%(1,653)
Asian0.5%(135)
Other2.6%(680)
Diversity Score
27
+149%since 2009
from 11 in 2009
2009 – 2024
Our index, 0 to 100. Higher means a more even mix of racial and ethnic groups.
Segregation Score
26
+57%since 2020
from 16 in 2020
Our index, 0 to 100. Higher means White and non-White residents are more separated across neighborhoods.
Section 04 · Origins

Detailed origins & ancestry

Hispanic origin
Mexican4.8%(1,235)
Honduran1%(253)
Puerto Rican0.2%(52)
Colombian0.1%(26)
Spaniard0.1%(23)
Asian origin
Filipino0.3%(69)
Laotian0.1%(28)
Vietnamese0.1%(18)
Chinese0.1%(14)
Pacific Islander origin
Chuukese0.2%(41)
Ancestry
German39%(10,029)
Irish12.1%(3,111)
American6.7%(1,735)
English6.3%(1,613)
Dutch4.4%(1,121)
Norwegian2.4%(624)
French1.7%(441)
Swedish1.4%(361)
Danish1.1%(284)
Polish1%(265)
Italian0.9%(242)
+ 22 more ancestry groups with data
Scottish0.9%(227)
Czech0.4%(98)
Scotch-Irish0.3%(83)
Welsh0.2%(49)
British0.1%(38)
Greek0.1%(30)
Belgian0.1%(28)
Swiss0.1%(25)
Australian0.1%(19)
Slovene0.1%(16)
Portuguese0.1%(15)
Russian0.1%(14)
Slovak0%(12)
Somali0%(9)
Arab0%(4)
RANKED:Largest German population · Largest Irish population · Largest American population · Largest English population · Largest Mexican population
Section 05

Education

Bachelor's degree or higher
21.7%
+2.4 ptssince 2000
from 19.3% in 2000
US average: 35.6%
High school or higher
94.8%
+7.4 ptssince 2000
from 87.4% in 2000
US average: 89.6%
Graduate degree
5.0%
+0.6 ptssince 2000
from 4.5% in 2000
US average: 14.0%
Section 06

Commute & transportation

Average commute
19.2 min
+44%since 2000
from 13.3 min in 2000
US average: 26.5
Drive alone to work
79.1%
−1.9 ptssince 2009
from 81.0% in 2009
US average: 68.9%
Carpooled to work
9.2%
−0.4 ptssince 2009
from 9.5% in 2009
US average: 8.5%
Public transit
0.6%
+0.2 ptssince 2009
from 0.3% in 2009
US average: 3.2%
Worked from home
9.2%
+2.8 ptssince 2009
from 6.4% in 2009
US average: 15.0%
Walked to work
1.1%
−1.1 ptssince 2009
from 2.2% in 2009
US average: 2.4%
Biked to work
0.2%
+0.1 ptssince 2009
from 0.0% in 2009
US average: 0.4%
No vehicle available
3.8%
−0.7 ptssince 2009
from 4.5% in 2009
US average: 8.3%
Section 07

Work & employment

Unemployment rate
2.2%
−0.1 ptssince 2011
from 2.3% in 2011
US average: 5.2%
Labor force participation
68.9%
−4.1 ptssince 2011
from 73.0% in 2011
US average: 63.5%
Self-employed
10.6%
+1.2 ptssince 2009
from 9.5% in 2009
US average: 13.1%
Management & professional
31.2%
−29.3 ptssince 2009
from 60.4% in 2009
US average: 42.5%
Section 08

People & community

Male
50.9%
+1.1 ptssince 2009
from 49.8% in 2009
Female
49.1%
−1.1 ptssince 2009
from 50.2% in 2009
Foreign born
3.7%
+2.5 ptssince 2009
from 1.2% in 2009
US average: 14.1%
Veterans
6.9%
−42.4 ptssince 2009
from 49.3% in 2009
US average: 6.2%
With a disability
11.5%
+2.0 ptssince 2012
from 9.5% in 2012
US average: 13.3%
Uninsured
5.3%
−88.8 ptssince 2013
from 94.1% in 2013
US average: 8.4%
Broadband at home
89.8%
+11.3 ptssince 2017
from 78.5% in 2017
US average: 91.0%
English only at home
93.1%
−2.1 ptssince 2016
from 95.2% in 2016
US average: 77.7%
Spanish at home
4.3%
+0.4 ptssince 2016
from 3.8% in 2016
US average: 13.6%
Marital status
Men 15+
Never married29.3%(3,046)
Married59.7%(6,215)
Widowed3%(311)
Divorced8%(838)
Women 15+
Never married22.3%(2,252)
Married59.2%(5,992)
Widowed9.8%(991)
Divorced8.7%(885)
SHARE WITHIN EACH SEX · POPULATION 15 AND OVER · 2024
Drill deeper

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Head to head

Compare Plymouth County to nearby counties

PLYMOUTH COUNTY VS
Union County
Income$89,636+8%
Home value$301,100+32%
Population17,402−32%
SEE FULL COMPARISON →
PLYMOUTH COUNTY VS
Sioux County
Income$86,098+3%
Home value$250,100+9%
Population36,774+43%
SEE FULL COMPARISON →
PLYMOUTH COUNTY VS
Woodbury County
Income$73,658−12%
Home value$183,200−20%
Population106,649+315%
SEE FULL COMPARISON →
PLYMOUTH COUNTY VS
Cherokee County
Income$71,269−14%
Home value$158,700−31%
Population11,369−56%
SEE FULL COMPARISON →
Frequently asked

How many people live in Plymouth County, Iowa?

Plymouth County, Iowa has about 25,747 residents according to the 2024 American Community Survey.

What is the median household income in Plymouth County, Iowa?

The typical household in Plymouth County, Iowa earns about $83,251 a year. Half of households make more than that, and half make less.

Is Plymouth County, Iowa expensive?

In Plymouth County, Iowa, the median home is worth about $228,900, and the typical rent is about $910 a month.

How educated are people in Plymouth County, Iowa?

About 21.7% of adults age 25 and over in Plymouth County, Iowa hold a bachelor's degree or higher.

What is the poverty rate in Plymouth County, Iowa?

About 6.9% of people in Plymouth County, Iowa live below the federal poverty line.

Has Plymouth County, Iowa grown since 1990?

Yes, Plymouth County, Iowa has grown since 1990. The population has added about 2,359 residents, a change of about 10 percent over that period.

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Explore from here

6 census tracts
Census Tract 9701Census Tract 9706Census Tract 9702Census Tract 9703Census Tract 9705Census Tract 9704
11 ZIP codes
ZIP 51031ZIP 51108ZIP 51109ZIP 51050ZIP 51001ZIP 51028ZIP 51024ZIP 51038ZIP 51062ZIP 51008ZIP 51045
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DATA: US CENSUS BUREAU ACS 5-YEAR + DECENNIAL CENSUS · UPDATED 2024

How we source and harmonize this data →