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.
White
Two or more races
Other race
Black or African American
Asian
Native Hawaiian or Pacific Islander
Native American
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