Washington County's 2026 population is estimated at 159,452, reflecting a 0.7% growth rate over the past year (World Population Review estimate based on U.S. Census Bureau data). Washington County is the 11th largest county in Maryland. The 2010 population was 147,727 and has grown 7.94% since 2010.
Data after 2023 is projected based on recent change
Overall: 40.7 years
Female: 42 years
Male: 39.4 years
There are 121,839 adults, (28,153 of whom are seniors) in Washington County.
Female: 76,620 (49.2%)
Male: 79,089 (50.8%)
The racial composition of Washington County includes 74.94% White, 11.58% Black or African American, and smaller percentages for other race, Asian, Native American, Native Hawaiian or Pacific Islander and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| White | 116,696 | 74.94% |
| Black or African American | 18,030 | 11.58% |
| Two or more races | 14,429 | 9.27% |
| Other race | 3,575 | 2.3% |
| Asian | 2,531 | 1.63% |
| Native American | 331 | 0.21% |
| Native Hawaiian or Pacific Islander | 117 | 0.08% |
Washington County 's average per capita income is $53,340. Household income levels show a median of $77,747. The poverty rate stands at 12.42%.
| Name | Median ↓ | Mean |
|---|---|---|
| Married Families | $112,890 | $132,866 |
| Families | $95,811 | $115,066 |
| Households | $77,747 | $99,335 |
| Non Families | $42,432 | $61,882 |
Average Income
Median Household Income
Poverty Rate