Washington County, Idaho
Located in Idaho, Washington County has a population of 11,142 residents and a median age of 45.0 years, making it the #2,408 most populous county out of 3,222 nationwide. In terms of economic indicators, the county has a poverty rate of 15.3%. The median home value is $278,100, and the median household income is $54,000, which is 28% below the national median.
Demographics
Washington County has a population of 11,142, making it the #2,408 most populous county in the US. The median age is 45.0 years, which is 15.7% 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 Washington County is $54,000, ranking #2,534 out of 3,222 counties — 28.1% below the national median. The poverty rate is 15.3% and unemployment stands at 5.2%.
Median Household Income Trend
Rankings →Income Distribution
Industry of Employment
Occupation
Housing
The median home value in Washington County is $278,100 (-1.3% vs national). Renters pay a median of $938/mo and the homeownership rate is 74.6%.
Median Home Value Trend
Rankings →Household Type
Education
In Washington County, 20.6% of adults age 25+ hold a bachelor's degree or higher, which is 38.8% below the national average, ranking #1,889 out of 3,222 counties.
Bachelor's Degree or Higher Trend
Rankings →Health & Wellbeing
Life expectancy in Washington County is 75.9 years. 18.6% of adults report poor or fair health and 9.2% lack health insurance. Data from County Health Rankings (2025).
Life Expectancy Trend
Substance Use
15.2% of adults in Washington County smoke , 38.5% are obese , and 18.1% report excessive drinking.
Adult Smoking Trend
Safety
The suicide rate is 21.8 per 100,000. Motor vehicle deaths occur at a rate of 21.9 per 100,000.
Suicide Rate Trend
Families & Children
17.0% of children in Washington County live in poverty . The teen birth rate is 20.1 per 1,000 females age 15–19.
Teen Birth Rate Trend
Civic & Transportation
Voter turnout in Washington County is 72.8%. The mean commute time is 21.1 min, which is 23.6% below the national average.
Voter Turnout Trend
Mean Commute Time Trend
Rankings →Elections
In the 2024 presidential election, Washington County voted Republican with a margin of 61.6%. The vote was 18.2% Dem / 79.8% Rep. Compared to 2020, the margin shifted 4.0 toward Republicans .
Vote Share Over Time
About Washington County, Idaho
Washington County, Idaho has a total population of 11,142, making it the 2,408th most populous county in the United States. The median age in Washington County is 45.0 years, which is 15.7% above the national median of 38.9 years.
The median household income in Washington County is $54,000, which ranks #2,534 of 3,222 counties nationwide. This is 28.1% below the national median of $75,149. The poverty rate is 15.3%, higher than the national rate of 12.6%. The unemployment rate stands at 5.2%.
The median home value in Washington County is $278,100, 1.3% below the national median. Renters in Washington County pay a median gross rent of $938 per month. The homeownership rate is 74.6%, compared to the national rate of 64.4%.
In Washington County, 20.6% of residents aged 25 and older hold a bachelor's degree or higher, 38.8% below the national average of 33.7%. Health insurance coverage stands at 91.0% of the population. The average commute time for workers is 21.1 min.
Washington County is a diverse community. The largest racial or ethnic group is White (non-Hispanic) at 77.6% of the population, followed by Hispanic or Latino (16.5%) and Two or More Races (4.3%).
All data for Washington County, Idaho 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.