Washington County's 2026 population is estimated at 13,465, reflecting a -0.26% growth rate over the past year (World Population Review estimate based on U.S. Census Bureau data). Washington County is the 76th largest county in Illinois. The 2010 population was 14,711 and has grown -8.47% since 2010.
Data after 2023 is projected based on recent change
Overall: 44.2 years
Female: 45.4 years
Male: 43.1 years
There are 10,791 adults, (2,948 of whom are seniors) in Washington County.
Female: 6,716 (49.3%)
Male: 6,911 (50.7%)
The racial composition of Washington County includes 95.16% White, and smaller percentages for Two or more races, Black or African American, other race, Asian, Native American and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| White | 12,968 | 95.16% |
| Two or more races | 354 | 2.6% |
| Black or African American | 202 | 1.48% |
| Other race | 51 | 0.37% |
| Asian | 32 | 0.23% |
| Native American | 20 | 0.15% |
Washington County 's average per capita income is $49,426. Household income levels show a median of $78,224. The poverty rate stands at 7.53%.
| Name | Median ↓ | Mean |
|---|---|---|
| Married Families | $110,019 | - |
| Families | $94,211 | $109,122 |
| Households | $78,224 | $93,788 |
| Non Families | $45,089 | $62,010 |
Average Income
Median Household Income
Poverty Rate
