Columbia County's estimated 2026 population is 3,965 with a growth rate of -0.75% in the past year according to the most recent United States census data. Columbia County is the 38th largest county in Washington. The 2010 population was 4,094 and has seen a growth of -3.15% since that time.
Data after 2023 is projected based on recent change
The racial composition of Columbia County includes 81.48% White, 4.25% other race, and smaller percentages for Black or African American, Native American, Asian and multiracial populations.
White (81.48%)
Two or more races (13.14%)
Other race (4.25%)
Black or African American (0.7%)
Native American (0.4%)
Asian (0.03%)
Race | Population | Percentage (of total) |
|---|---|---|
| White | 3,256 | 81.48% |
| Two or more races | 525 | 13.14% |
| Other race | 170 | 4.25% |
| Black or African American | 28 | 0.7% |
| Native American | 16 | 0.4% |
| Asian | 1 | 0.03% |
Married
Widowed
Divorced
Separated
Never Married
Columbia County's average per capita income is $55,580. Household income levels show a median of $71,528. The poverty rate stands at 9.03%.
Name | Median | Mean |
|---|---|---|
| Married Families | $105,203 | - |
| Families | $101,653 | $113,458 |
| Households | $71,528 | $89,990 |
| Non Families | $40,735 | $44,670 |
Average Income
Median Household Income
Poverty Rate