COUNTY · 1990 CENSUS

Plymouth County

Iowa · 23,388 residents · 862.828 sq mi

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The short version

Plymouth County has lower-than-average household income, with a median household income of $26,796. Population has declined 6% since 2000. Median home value is $48,100.

At a glance

Lower income

below the US median

US median: $30,130

Mid-age

median age 34.1

US median: 33.0

Less educated

15% hold a bachelor's degree

US average: 20%

More affordable

home values down 30%, inflation adjusted

US median home: $93,722

Section 01

Population & growth

Total population

23,388

−6%vs 2000

vs 24,849 in 2000

1990 – 2025

Population density

27 / sq mi

−6%vs 2000

vs 29 / sq mi in 2000

US average: 221

Median age

34.1

−10%vs 2000

vs 37.8 in 2000

US average: 33.0

Population, 1990 – 2024

202426K

Section 02

Income & economy

Median household income

$26,796

−15%inflation adjusted, since 2000

vs $41,638 in 2000

US average: $30,130

1990 – 2024

Per capita income

$11,507

−41%vs 2000

vs $19,442 in 2000

US average: $14,340

Poverty rate

9.0%

+3.0 ptsvs 2000

vs 6.0% in 2000

US average: 13.2%

Section 03

Housing

Median home value

$48,100

−30%inflation adjusted, since 2000

vs $90,100 in 2000

US average: $93,722

1990 – 2024

Median gross rent

$298

−6%inflation adjusted, since 2000

vs $416 in 2000

US average: $450

Owner-occupied

74.8%

−2.7 ptsvs 2000

vs 77.5% in 2000

25.2% rent

Afford Score

1.8

−17%vs 2000

vs 2.2 in 2000

1990 – 2024

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%

Diversity Score4.6%(1,141)

1990

White, non-Hispanic99.6%(23,299)

Black0.1%(28)

Hispanic / Latino0.1%(33)

Asian0%(8)

Other0.2%(53)

Diversity Score1.3%(304)

Diversity Score

−72%vs 2000

vs 5 in 2000

1990 – 2024

Section 05

Education

Bachelor's degree or higher

15.0%

−4.3 ptsvs 2000

vs 19.3% in 2000

US average: 20.3%

High school or higher

78.0%

−9.4 ptsvs 2000

vs 87.4% in 2000

US average: 75.2%

Graduate degree

4.2%

−0.3 ptsvs 2000

vs 4.5% in 2000

US average: 7.1%

Section 06

Commute & transportation

Average commute

26.3 min

+98%vs 2000

vs 13.3 min in 2000

US average: 21.9

Section 07

Work & employment

No data for the years selected.

Section 08

People & community

No data for the years selected.

Drill deeper

Places similar to Plymouth County

Head to head

Compare Plymouth County to nearby counties

PLYMOUTH COUNTY VS

Union County

Income$89,636+235%

Home value$301,100+526%

Population17,402−32%

SEE FULL COMPARISON →

PLYMOUTH COUNTY VS

Sioux County

Income$86,098+221%

Home value$250,100+420%

Population36,774+43%

SEE FULL COMPARISON →

PLYMOUTH COUNTY VS

Woodbury County

Income$73,658+175%

Home value$183,200+281%

Population106,649+315%

SEE FULL COMPARISON →

PLYMOUTH COUNTY VS

Cherokee County

Income$71,269+166%

Home value$158,700+230%

Population11,369−56%

SEE FULL COMPARISON →

Frequently asked

How many people live in Plymouth County, Iowa?

Plymouth County, Iowa has about 23,388 residents according to the 1990 Census.

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

The typical household in Plymouth County, Iowa earns about $26,796 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 $48,100, and the typical rent is about $298 a month.

How educated are people in Plymouth County, Iowa?

About 15.0% 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 9.0% of people in Plymouth County, Iowa live below the federal poverty line.

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Explore from here

6 census tracts

Census Tract 9701 Census Tract 9706 Census Tract 9702 Census Tract 9703 Census Tract 9705 Census Tract 9704

11 ZIP codes

ZIP 51031 ZIP 51108 ZIP 51109 ZIP 51050 ZIP 51001 ZIP 51028 ZIP 51024 ZIP 51038 ZIP 51062 ZIP 51008 ZIP 51045

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DATA: US CENSUS BUREAU ACS 5-YEAR + DECENNIAL CENSUS · UPDATED 2024

How we source and harmonize this data →