Jefferson County's estimated 2026 population is 34,049 with a growth rate of 0.23% in the past year according to the most recent United States census data. Jefferson County is the 27th largest county in Washington. The 2010 population was 29,899 and has seen a growth of 13.88% since that time.
Data after 2023 is projected based on recent change
Overall: 59.8 years
Female: 61.1 years
Male: 57.9 years
There are 29,830 adults, (13,673 of whom are seniors) in Jefferson County.
Female: 17,208 (51.2%)
Male: 16,369 (48.8%)
The racial composition of Jefferson County includes 85.56% White, and smaller percentages for other race, Asian, Native American, Black or African American, Native Hawaiian or Pacific Islander and multiracial populations.
Race | Population | Percentage (of total) |
|---|---|---|
| White | 28,727 | 85.56% |
| Two or more races | 3,108 | 9.26% |
| Other race | 785 | 2.34% |
| Asian | 434 | 1.29% |
| Native American | 357 | 1.06% |
| Black or African American | 131 | 0.39% |
| Native Hawaiian or Pacific Islander | 35 | 0.1% |
Jefferson County's average per capita income is $46,827. Household income levels show a median of $74,048. The poverty rate stands at 11.09%.
Name | Median | Mean |
|---|---|---|
| Married Families | $110,438 | - |
| Families | $101,475 | $133,915 |
| Households | $74,048 | $104,756 |
| Non Families | $41,005 | $60,303 |
Average Income
Median Household Income
Poverty Rate