Plymouth County's estimated 2025 population is 25,722 with a growth rate of 0% in the past year according to the most recent United States census data. Plymouth County is the 25th largest county in Iowa. The 2010 population was 24,978 and has seen a growth of 2.98% since that time.
Data after 2023 is projected based on recent change
The racial composition of Plymouth County includes 90.55% White, and smaller percentages for Black or African American, other race, Asian, Native American, Native Hawaiian or Pacific Islander and multiracial populations.
White
Two or more races
Black or African American
Other race
Asian
Native American
Native Hawaiian or Pacific Islander
Race | Population | Percentage (of total) |
|---|---|---|
| White | 23,270 | 90.55% |
| Two or more races | 1,001 | 3.9% |
| Black or African American | 607 | 2.36% |
| Other race | 587 | 2.28% |
| Asian | 135 | 0.53% |
| Native American | 86 | 0.33% |
| Native Hawaiian or Pacific Islander | 13 | 0.05% |
Married
Widowed
Divorced
Separated
Never Married
Plymouth County's average per capita income is $51,262. Household income levels show a median of $81,600. The poverty rate stands at 6.76%.
Name | Median | Mean |
|---|---|---|
| Married Families | $107,955 | - |
| Families | $94,139 | $120,378 |
| Households | $81,600 | $103,320 |
| Non Families | $45,115 | $59,683 |
Average Income
Median Household Income
Poverty Rate
