Plymouth County's estimated 2026 population is 25,710 with a growth rate of 0.05% 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 2.93% since that time.
Data after 2023 is projected based on recent change
Overall: 41.3 years
Female: 41.9 years
Male: 40.3 years
There are 19,304 adults, (5,096 of whom are seniors) in Plymouth County.
Female: 12,632 (49.1%)
Male: 13,115 (50.9%)
The racial composition of Plymouth County includes 89.42% White, and smaller percentages for Black or African American, other race, Asian, Native Hawaiian or Pacific Islander, Native American and multiracial populations.
Race | Population | Percentage (of total) |
|---|---|---|
| White | 23,022 | 89.42% |
| Two or more races | 1,222 | 4.75% |
| Black or African American | 615 | 2.39% |
| Other race | 531 | 2.06% |
| Asian | 135 | 0.52% |
| Native Hawaiian or Pacific Islander | 112 | 0.44% |
| Native American | 110 | 0.43% |
Plymouth County's average per capita income is $51,815. Household income levels show a median of $83,251. The poverty rate stands at 6.9%.
Name | Median | Mean |
|---|---|---|
| Married Families | $111,690 | - |
| Families | $97,910 | $117,624 |
| Households | $83,251 | $101,116 |
| Non Families | $46,225 | $59,163 |
Average Income
Median Household Income
Poverty Rate
