Plymouth County's estimated 2026 population is 25,945 with a growth rate of 0.23% in the past year according to the most recent United States census data. Plymouth County is the 24th largest county in Iowa. The 2010 population was 24,978 and has seen a growth of 3.87% 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 (90.55%)
Two or more races (3.9%)
Black or African American (2.36%)
Other race (2.28%)
Asian (0.53%)
Native American (0.33%)
Native Hawaiian or Pacific Islander (0.05%)
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
