Washington County's estimated 2025 population is 22,596 with a growth rate of 0.08% in the past year according to the most recent United States census data. Washington County is the 27th largest county in Iowa. The 2010 population was 21,687 and has seen a growth of 4.19% since that time.
Data after 2023 is projected based on recent change
The racial composition of Washington County includes 91.34% White, 3.73% other race, and smaller percentages for Black or African American, Asian, Native Hawaiian or Pacific Islander, Native American and multiracial populations.
Race | Population | Percentage (of total) |
|---|---|---|
| White | 20,588 | 91.34% |
| Two or more races | 846 | 3.75% |
| Other race | 841 | 3.73% |
| Black or African American | 143 | 0.63% |
| Asian | 112 | 0.5% |
| Native Hawaiian or Pacific Islander | 7 | 0.03% |
| Native American | 2 | 0.01% |
Married
Widowed
Divorced
Separated
Never Married
Washington County's average per capita income is $45,570. Household income levels show a median of $71,339. The poverty rate stands at 8.48%.
Name | Median | Mean |
|---|---|---|
| Married Families | $100,278 | - |
| Families | $87,727 | $107,098 |
| Households | $71,339 | $92,270 |
| Non Families | $40,799 | $57,669 |
Average Income
Median Household Income
Poverty Rate