Columbia County, Washington
Located in Washington, Columbia County has a population of 4,014 residents and a median age of 49.6 years, making it the #2,963 most populous county out of 3,222 nationwide. In terms of economic indicators, the county has a poverty rate of 9.3%. The median home value is $271,200, and the median household income is $71,810, which is 4% below the national median.
Demographics
Columbia County has a population of 4,014, making it the #2,963 most populous county in the US. The median age is 49.6 years, which is 27.5% above the national median.
Population Trend
Rankings →Year-over-Year Population Growth
Age & Sex Distribution
Race & Ethnicity
Nativity
Geographic Mobility (Past Year)
Economy
The median household income in Columbia County is $71,810, ranking #1,061 out of 3,222 counties — 4.4% below the national median. The poverty rate is 9.3% and unemployment stands at 3.9%.
Median Household Income Trend
Rankings →Income Distribution
Industry of Employment
Occupation
Housing
The median home value in Columbia County is $271,200 (-3.8% vs national). Renters pay a median of $985/mo and the homeownership rate is 77.7%.
Median Home Value Trend
Rankings →Household Type
Education
In Columbia County, 24.9% of adults age 25+ hold a bachelor's degree or higher, which is 26.1% below the national average, ranking #1,237 out of 3,222 counties.
Bachelor's Degree or Higher Trend
Rankings →Health & Wellbeing
Life expectancy in Columbia County is 76.6 years. 17.5% of adults report poor or fair health and 7.6% lack health insurance. Data from County Health Rankings (2025).
Life Expectancy Trend
Substance Use
14.2% of adults in Columbia County smoke , 38.3% are obese , and 21.3% report excessive drinking.
Adult Smoking Trend
Safety
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Families & Children
18.6% of children in Columbia County live in poverty . The teen birth rate is 16.8 per 1,000 females age 15–19.
Teen Birth Rate Trend
Civic & Transportation
Voter turnout in Columbia County is 78.3%. The mean commute time is 26.3 min, which is 4.7% below the national average.
Voter Turnout Trend
Mean Commute Time Trend
Rankings →Elections
In the 2024 presidential election, Columbia County voted Republican with a margin of 43.5%. The vote was 26.7% Dem / 70.2% Rep. Compared to 2020, the margin shifted 0.0 toward Republicans .
Vote Share Over Time
About Columbia County, Washington
Columbia County, Washington has a total population of 4,014, making it the 2,963rd most populous county in the United States. The median age in Columbia County is 49.6 years, which is 27.5% above the national median of 38.9 years.
The median household income in Columbia County is $71,810, which ranks #1,061 of 3,222 counties nationwide. This is 4.4% below the national median of $75,149. The poverty rate is 9.3%, lower than the national rate of 12.6%. The unemployment rate stands at 3.9%.
The median home value in Columbia County is $271,200, 3.8% below the national median. Renters in Columbia County pay a median gross rent of $985 per month. The homeownership rate is 77.7%, compared to the national rate of 64.4%.
In Columbia County, 24.9% of residents aged 25 and older hold a bachelor's degree or higher, 26.1% below the national average of 33.7%. Health insurance coverage stands at 92.2% of the population. The average commute time for workers is 26.3 min.
Columbia County is a diverse community. The largest racial or ethnic group is White (non-Hispanic) at 81.2% of the population, followed by Hispanic or Latino (8.3%) and Two or More Races (7.5%).
All data for Columbia County, Washington comes from the U.S. Census Bureau's American Community Survey (ACS) 5-Year Estimates. These figures are estimates based on survey sampling and are subject to margin of error. For the most detailed and up-to-date data, visit the Census Bureau's official data portal.