Washington County, Idaho Demographics 2026
Washington County, Idaho has a population of 11,142, the 29th most populous county in Idaho. The median household income is $54,000 and the median home value is $278,100. The poverty rate is 15.3%.
Data vintage: U.S. Census Bureau ACS 2020–2024 5-Year Estimates · refreshed July 2026 · Methodology & source notes
Washington County Quick Facts
How Washington County Changed
Change from the 2019–2023 ACS period to 2020–2024. These are rolling five-year estimates, not year-over-year measurements.
| Metric | 2019–2023 | 2020–2024 | Change |
|---|---|---|---|
| Population | 10,866 | 11,142 | +2.5% |
| Median household income | $53,608 | $54,000 | +0.7% |
| Median home value | $250,300 | $278,100 | +11.1% |
Median Household Income
Median Home Value
Economy & Housing
Household Income Distribution
Detailed income brackets
Employment
Housing Overview
People & Demographics
Age Distribution
Race & Ethnicity
Diversity Index
A less diverse community where one racial or ethnic group represents a large majority.
State average: 36 | National average: 61
Education
Educational Attainment (Adults 25+)
Cities & Places in Washington County
Explore Idaho Rankings
Population Overview
Washington County is located in Idaho with a total population of 11,142. It is the 29th most populous county out of 44 in Idaho. The county encompasses 3 Census-designated places.
Age Demographics
The median age in Washington County is 45.0 years. This is 21% higher than the state median of 37.3 years. 10.0% of residents are 75 or older, suggesting a significant retirement-age population with implications for healthcare services and senior housing.
Economy, Income & Housing
The median household income in Washington County is $54,000. This is 31% lower than the state median of $77,800. It is also 33% lower than the national median of $80,734. The poverty rate stands at 15.3%. This is 44% higher than the state poverty rate of 10.6%. The unemployment rate is 5.2%. This is 40% higher than the state rate of 3.7%. The median home value is $278,100. Housing costs are 34% lower than the state median of $418,600. The home-value-to-income ratio is 5.2x. 74.6% of occupied housing units are owner-occupied. This homeownership rate is 3% higher than the state average of 72.1%.
Race & Ethnicity
The largest racial or ethnic group in Washington County is White (non-Hispanic), making up 77.6% of the population. Hispanic or Latino residents account for 16.5%. The Black or African American population (0.3%) is well below the state average of 0.7%. The Asian population (0.7%) is well below the state average of 1.3%.
Education
20.6% of residents aged 25 and older hold a bachelor's degree or higher. This is 35% lower than the state rate of 31.8%. Nationally, 35.7% of adults hold at least a bachelor's degree. The high school graduation rate (or equivalent) is 89.6%.
Data Sources & Methodology
All figures for Washington County come from the U.S. Census Bureau's American Community Survey (ACS) 2020–2024 5-Year Estimates, with comparisons drawn against Idaho and national averages from the same dataset. See our methodology page for how each metric is defined, or data.census.gov for official tables with margins of error.
Frequently Asked Questions
What is the population of Washington County, Idaho?
Washington County has a population of 11,142, making it the 29th most populous county in Idaho.
What is the median income in Washington County?
The median household income in Washington County is $54,000 with a poverty rate of 15.3%.
How many cities are in Washington County, Idaho?
Washington County contains 3 Census-designated places.