Jefferson County's estimated 2026 population is 34,382 with a growth rate of 0.64% 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 14.99% since that time.
Data after 2023 is projected based on recent change
The racial composition of Jefferson County includes 86.69% White, and smaller percentages for other race, Asian, Native American, Black or African American, Native Hawaiian or Pacific Islander and multiracial populations.
White (86.69%)
Two or more races (7.95%)
Other race (2.4%)
Asian (1.33%)
Native American (1.14%)
Black or African American (0.38%)
Native Hawaiian or Pacific Islander (0.12%)
Race | Population | Percentage (of total) |
|---|---|---|
| White | 28,880 | 86.69% |
| Two or more races | 2,647 | 7.95% |
| Other race | 798 | 2.4% |
| Asian | 443 | 1.33% |
| Native American | 380 | 1.14% |
| Black or African American | 125 | 0.38% |
| Native Hawaiian or Pacific Islander | 40 | 0.12% |
Married
Widowed
Divorced
Separated
Never Married
Jefferson County's average per capita income is $42,012. Household income levels show a median of $71,143. The poverty rate stands at 12.57%.
Name | Median | Mean |
|---|---|---|
| Married Families | $105,101 | - |
| Families | $98,262 | $129,645 |
| Households | $71,143 | $101,205 |
| Non Families | $40,457 | $58,420 |
Average Income
Median Household Income
Poverty Rate