Washington County's estimated 2026 population is 22,732 with a growth rate of 0.29% 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 4.82% since that time.
Data after 2023 is projected based on recent change
Overall: 40.7 years
Female: 41 years
Male: 40.4 years
There are 17,028 adults, (4,538 of whom are seniors) in Washington County.
Female: 11,310 (50.1%)
Male: 11,251 (49.9%)
The racial composition of Washington County includes 90.14% White, 3.16% 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 | 20,337 | 90.14% |
| Two or more races | 1,181 | 5.23% |
| Other race | 714 | 3.16% |
| Black or African American | 236 | 1.05% |
| Asian | 87 | 0.39% |
| Native Hawaiian or Pacific Islander | 4 | 0.02% |
| Native American | 2 | 0.01% |
Washington County's average per capita income is $46,943. Household income levels show a median of $75,647. The poverty rate stands at 8.2%.
Name | Median | Mean |
|---|---|---|
| Married Families | $101,998 | - |
| Families | $88,958 | $110,017 |
| Households | $75,647 | $95,752 |
| Non Families | $40,704 | $59,196 |
Average Income
Median Household Income
Poverty Rate