Plymouth County, IA

County

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2024 Population

25,747

US Senator

Chuck Grassley

Republican Party

US Senator

Joni Ernst

Republican Party

2024 Median Age

41.3

0.487% 1-year increase

2024 Poverty Rate

6.9%

2.1% 1-year increase

2024 Median Household Income

$83,251

2.02% 1-year growth

2024 Median Property Value

$228,900

4.71% 1-year growth

2024 Employed Population

13,519

0.0074% 1-year decline

About

None of the households in Plymouth County, IA reported speaking a non-English language at home as their primary shared language. This does not consider the potential multi-lingual nature of households, but only the primary self-reported language spoken by all members of the household.

97.9% of the residents in Plymouth County, IA are U.S. citizens.

In 2024, the median property value in Plymouth County, IA was $228,900, and the homeownership rate was 73.6%.

Most people in Plymouth County, IA drove alone to work, and the average commute time was 19.2 minutes. The average car ownership in Plymouth County, IA was 2 cars per household.

Plymouth County, IA borders Cherokee County, IA, O'Brien County, IA, Sioux County, IA, Woodbury County, IA, and Union County, SD.

United States Iowa Sioux City, IA-NE-SD

Population & Diversity

Plymouth County, IA is home to a population of 25.7k people, from which 97.9% are citizens. As of 2024, 3.72% of Plymouth County, IA residents were born outside of the country (959 people).

In 2024, there were 34.6 times more White (Non-Hispanic) residents (22.7k people) in Plymouth County, IA than any other race or ethnicity. There were 655 Two Races Including Other (Hispanic) and 615 Black or African American (Non-Hispanic) residents, the second and third most common ethnic groups.

Population & Diversity

Citizenship

97.9%

2024 Citizenship

97.5%

2023 Citizenship

As of 2024, 97.9% of Plymouth County, IA residents were US citizens, which is higher than the national average of 93.2%. In 2023, the percentage of US citizens in Plymouth County, IA was 97.5%, meaning that the rate of citizenship has been increasing.

The following chart shows US citizenship percentages in Plymouth County, IA compared to that of it's neighboring and parent geographies.

Diversity

Race and Ethnicity

The 3 largest ethnic groups in Plymouth County, IA

White (Non-Hispanic)
22.7k ± 69
Two Races Including Other (Hispanic)
655 ± 194
Black or African American (Non-Hispanic)
615 ± 64

6.42%

Hispanic Population

1.65k people

6.42% of the people in Plymouth County, IA are hispanic (1.65k people).

The following chart shows the 8 races represented in Plymouth County, IA as a share of the total population.

Global Diversity

The PUMS dataset is not available at the County level, so we are showing data for Iowa.

Most Common Origin

Mexico
44,333 ± 5,134 people
India
11,889 ± 2,672 people
Guatemala
8,189 ± 2,219 people

In 2024, the most common birthplace for the foreign-born residents of Iowa was Mexico, the natal country of 44,333 Iowa residents, followed by India with 11,889 and Guatemala with 8,189.

Foreign-Born Population

3.72%

2024 Foreign-Born Population

959 people

4.25%

2023 Foreign-Born Population

1.09k people

As of 2024, 3.72% of Plymouth County, IA residents (959 people) were born outside of the United States, which is approximately the same as the national average of 14%. In 2023, the percentage of foreign-born citizens in Plymouth County, IA was 4.25%, meaning that the rate has been decreasing.

The following chart shows the percentage of foreign-born residents in Plymouth County, IA compared to that of it's neighboring and parent geographies.

Military

Veterans

Most Common Service Period

Vietnam
648 ± 133
Gulf War (1990s)
200 ± 81
Gulf War (2001-)
195 ± 84

Plymouth County, IA has a large population of military personnel who served in Vietnam, 3.24 times greater than any other conflict.

The chart shows the distribution of veterans by conflict in Plymouth County, IA.

Health

94.7% of the population of Plymouth County, IA has health coverage, with 51.1% on employee plans, 13.4% on Medicaid, 13.9% on Medicare, 14.9% on non-group plans, and 1.36% on military or VA plans.

Primary care physicians in Plymouth County, IA see 1,832 patients per year on average, which represents a 0% change from the previous year (1,832 patients). Compare this to dentists who see 1975 patients per year, and mental health providers who see 504 patients per year.

By gender, of the total number of insured persons, 51.1% were men and 48.9% were women.

Coverage

Patient to Clinician Ratios

1,832 to 1

Patient to Primary Care Physician Ratio in Plymouth County, IA

Primary care physicians in Plymouth County, IA see an average of 1,832 patients per year. This represents a 0% change from the previous year (1,832 patients).

The following chart shows how the number of patients seen by primary care physicians has been changing over time in Plymouth County, IA in comparison to its neighboring geographies.

Health Care Diversity

In 2024, insured persons according to age ranges were distributed in 26.6% under 18 years, 16.9% between 18 and 34 years, 37.5% between 35 and 64 years, and 19% over 64 years.

By gender, of the total number of insured persons, 51.1% were men and 48.9% were women.

The following chart shows the number of people with health coverage by gender.

Uninsured People

5.31%

Uninsured

51.1%

Employer Coverage

13.4%

Medicaid

13.9%

Medicare

14.9%

Non-Group

1.36%

Military or VA

Between 2023 and 2024, the percent of uninsured citizens in Plymouth County, IA declined by 5.34% from 5.61% to 5.31%.

The following chart shows how the percent of uninsured individuals in Plymouth County, IA changed over time compared with the percent of individuals enrolled in various types of health insurance.

Health Indicators

Health Outcomes

Indicator

In 2025, the average number of mentally unhealthy days reported in past 30 days (age-adjusted) was 4.68 in Plymouth County, IA.

The graphic shows the trend of the indicator in Plymouth County, IA.

Health Behaviors

Indicator

In 2025, the percentage of the adult population (age 18 and older) that reports a body mass index (BMI) greater than or equal to 30 kg/m2 (age-adjusted) was 37.5% in Plymouth County, IA.

The graphic shows the trend of the indicator in Plymouth County, IA.

Clinical Care

Indicator

In 2025, the percentage of population under age 65 without health insurance was 4.6% in Plymouth County, IA.

The graphic shows the trend of the indicator in Plymouth County, IA.

Economy

The economy of Plymouth County, IA employs 13.5k people. In 2024, the largest industries in Plymouth County, IA were Manufacturing (2,645 people), Health Care & Social Assistance (2,019 people), and Retail Trade (1,222 people), and the highest paying industries were Real Estate & Rental & Leasing ($84,286), Mining, Quarrying, & Oil & Gas Extraction ($80,938), and Utilities ($74,833).

Employment

Occupations

13.5k

2024 Value

± 699

−0.0074%

1 Year decline

± 7.31%

From 2023 to 2024, employment in Plymouth County, IA declined at a rate of −0.0074%, from 13.5k employees to 13.5k employees.

The most common job groups, by number of people living in Plymouth County, IA, are Office & Administrative Support Occupations (1,644 people), Production Occupations (1,556 people), and Management Occupations (1,466 people). This chart illustrates the share breakdown of the primary jobs held by residents of Plymouth County, IA.

Unemployment Insurance Claims

Data is only available at the state level. Showing data for Iowa.

This chart shows weekly unemployment insurance claims in Iowa (not-seasonally adjusted) compared with the four states with the most similar impact.

The most recent data point uses Advance State Claims data, which can be revised in subsequent weeks.

Industries

Employment by Industries

13.5k

2024 Value

± 699

−0.0074%

1 Year decline

± 7.31%

From 2023 to 2024, employment in Plymouth County, IA declined at a rate of −0.0074%, from 13.5k employees to 13.5k employees.

The most common employment sectors for those who live in Plymouth County, IA, are Manufacturing (2,645 people), Health Care & Social Assistance (2,019 people), and Retail Trade (1,222 people). This chart shows the share breakdown of the primary industries for residents of Plymouth County, IA, though some of these residents may live in Plymouth County, IA and work somewhere else. Census data is tagged to a residential address, not a work address.

Median Earnings by Industry

$60,585

Median earning men ± $3,318

$39,783

Median earning women ± $2,015

The industries with the best median earnings for men in 2024 are Finance & Insurance, & Real Estate & Rental & Leasing ($86,667), Public Administration ($71,849), and Agriculture, Forestry, Fishing & Hunting, & Mining ($67,018).

The industries with the best median earnings for women in 2024 are Construction ($54,063), Public Administration ($51,385), and Finance & Insurance, & Real Estate & Rental & Leasing ($50,865).

Employment by Industry Sector

Data is only available at the state level. Showing data for Iowa.

Y-Axis

1.48%

Year-over-year growth

Employment change between February 2022 and February 2023

As of February 2023, there are 1.57M people employed in Iowa. This represents a 1.48% increase in employment when compared to February 2022.

Right after the beginning of the COVID-19 pandemic, during April 2020, a general dip can be seen across industry sectors, resulting in an overall decline in employment by 10.9%.

The following chart shows monthly employment numbers for each industry sector in Iowa.

Establishments by Size

The industries with the most establishments

64
Other Services (except Public Administration)
60
Construction
48
Transportation and Warehousing

The visualization shows the distribution of establishments by industry and by size according to the number of employees.

The visualization shows the number of establishments and its share across establishment sizes.

Payroll by Industry Sector

The industries with the highest total annual payroll

$222k
Manufacturing
$82.5k
Transportation and Warehousing
$48.3k
Management of Companies and Enterprises

The chart shows the total annual payroll and the average annual payroll by industry.

Civics

In the 2024 presidential election, the popular vote in Iowa went to Donald J. Trump with 55.7% of the vote. The runner-up was Kamala Harris (42.5%), followed by Robert Kennedy (0.789%).

Chuck Grassley and Joni Ernst are the senators currently representing the state of Iowa. In the United States, senators are elected to 6-year terms with the terms for individual senators staggered.

Iowa is currently represented by 4 members in the U.S. house, and members of the House of Representives are elected to 2-year terms.

Presidential Elections

Presidential Popular Vote Over Time

Voting results are not available for Plymouth County, IA. Showing the available data for Iowa.

2024 Election Results

Donald J. Trump (55.7%)
Republican Party
Kamala Harris (42.5%)
Democratic Party
Robert Kennedy (0.789%)
Independent Party

In the 2024 presidential election, the popular vote in Iowa went to Donald J. Trump with 55.7% of the vote. The runner-up was Kamala Harris (42.5%), followed by Robert Kennedy (0.789%).

The following chart shows the popular vote results in Iowa for each registered party from 1976 to 2024.

Senator Elections

US Senators from Iowa

Senatorial voting results are only available at the state level. Showing data for Iowa.

Chuck Grassley

Senator from Iowa

Assumed office on January 3, 1981

Joni Ernst

Senator from Iowa

Assumed office on January 3, 2015

Chuck Grassley and Joni Ernst are the senators currently representing Iowa.

In the United States, senators are elected to 6-year terms with the terms for individual senators staggered.

The following chart shows elected senators in Iowa over time, excluding special elections, colored by their political party.

Housing & Living

The median property value in Plymouth County, IA was $228,900 in 2024, which is 0.688 times smaller than the national average of $332,700. Between 2023 and 2024 the median property value increased from $218,600 to $228,900, a 4.71% increase. The homeownership rate in Plymouth County, IA is 73.6%, which is higher than the national average of 65.2%.

People in Plymouth County, IA have an average commute time of 19.2 minutes, and they drove alone to work. Car ownership in Plymouth County, IA is approximately the same as the national average, with an average of 2 cars per household.

In 2025, 7.75% of the population was living with severe housing problems in Plymouth County, IA. From 2014 to 2025, the indicator grew 2.05%.

Housing

Property

$228,900

Median Property Value 2024

±$9,640

$7,591

Median Property Taxes

±$482

The following chart display owner-occupied housing units distributed between a series of property tax buckets compared to the national averages for each bucket. In Plymouth County, IA the largest share of households pay taxes in the $3k+ range.

The chart underneath the paragraph shows the property taxes in Plymouth County, IA compared to it's parent and neighbor geographies.

Rent vs Own

73.6%

Homeownership

2024

61.6%

Homeowners with Mortgage

2024

In 2024, 73.6% of the housing units in Plymouth County, IA were occupied by their owner. This percentage declined from the previous year's rate of 73.7%.

This chart shows the percentage of owner in Plymouth County, IA compared it's parent and neighboring geographies.

Equity

Household Income

Please note that the buckets used in this visualization were not evenly distributed by ACS when publishing the data.

$83,251

Median Household Income

± $4,100

10.3k

Number of Households

± 617

In 2024, the median household income of the 10.3k households in Plymouth County, IA grew to $83,251 from the previous year's value of $81,600.

The following chart displays the households in Plymouth County, IA distributed between a series of income buckets compared to the national averages for each bucket. The largest share of households have an income in the $75k - $100k range.

Wage Distribution

The closest comparable wage GINI for Plymouth County, IA is from Iowa.

0.435

2024 Wage GINI in Iowa

0.441

2023 Wage GINI in Iowa

In 2024, the income inequality in Iowa was 0.435 according to the GINI calculation of the wage distribution. Income inequality had a 1.29% decline from 2023 to 2024, which means that wage distribution grew somewhat more even. The GINI for Iowa was lower than than the national average of 0.474. In other words, wages are distributed more evenly in Iowa in comparison to the national average.

This chart shows the number of workers in Iowa across various wage buckets compared to the national average.

Transportation

Commuter Transportation

Most Common Commute in 2024

Drove Alone (79.1%)
Worked At Home (9.19%)
Carpooled (9.16%)

In 2024, 79.1% of workers in Plymouth County, IA drove alone to work, followed by those who worked at home (9.19%) and those who carpooled to work (9.16%).

The following chart shows the number of households using each mode of transportation over time, using a logarithmic scale on the y-axis to help better show variations in the smaller means of commuting.

Commute Time

19.2 minutes

Average Travel Time

Using averages, employees in Plymouth County, IA have a shorter commute time (19.2 minutes) than the normal US worker (26.4 minutes). Additionally, 1.66% of the workforce in Plymouth County, IA have "super commutes" in excess of 90 minutes.

The chart below shows how the median household income in Plymouth County, IA compares to that of it's neighboring and parent geographies.

Car Ownership

2 cars

Average Number

The following chart displays the households in Plymouth County, IA distributed between a series of car ownership buckets compared to the national averages for each bucket. The largest share of households in Plymouth County, IA have 2 cars.

Poverty

Severe Housing Problems

In 2025, 7.75% of the population was living with severe housing problems in Plymouth County, IA. From 2014 to 2025, the indicator grew 2.05%.

The graph shows the trend of the percentage of the population living with severe housing problems.

Poverty & Diversity

6.9% of the population for whom poverty status is determined in Plymouth County, IA (1.75k out of 25.4k people) live below the poverty line, a number that is lower than the national average of 12.5%. The largest demographic living in poverty are Females 75+, followed by Females 65 - 74 and then Females 6 - 11.

The most common racial or ethnic group living below the poverty line in Plymouth County, IA is White, followed by Hispanic and Two Or More.

The Census Bureau uses a set of money income thresholds that vary by family size and composition to determine who classifies as impoverished. If a family's total income is less than the family's threshold than that family and every individual in it is considered to be living in poverty.

Children in Poverty

In 2025, 10.9% of the children was living in poverty in Plymouth County, IA. From 2014 to 2025, the indicator grew 0.7%.

The graph shows the trend of the percentage of the children living in poverty.

Social Needs

Data only available at the state level.

Most prevalent states

California
35,798 individuals
New York
5,087 individuals

In 2017, California had the highest estimated number of chronically homeless individuals in the nation, at 35,798, followed by New York (5,087).

The following map shows the estimated number of chronically homeless individuals by state over multiple years.

Security

Crimes & Accidents

Indicator

In 2022, the number of reported violent crimes offenses per 100,000 population was 103 in Plymouth County, IA. From 2014 to 2022, the indicator grew 8.38% per 100,000 population.

The graph shows the trend in the number of reported violent crimes offenses per 100,000 population.