Washington County, Iowa
Located in Iowa, Washington County has a population of 22,561 residents and a median age of 40.7 years, making it the #1,743 most populous county out of 3,222 nationwide. In terms of economic indicators, the county has a poverty rate of 8.2%. The median home value is $203,900, and the median household income is $75,647, which is 1% above the national median.
Demographics
Washington County has a population of 22,561, making it the #1,743 most populous county in the US. The median age is 40.7 years, which is 4.6% 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 $75,647, ranking #801 out of 3,222 counties — 0.7% above the national median. The poverty rate is 8.2% and unemployment stands at 2.2%.
Median Household Income Trend
Rankings →Income Distribution
Industry of Employment
Occupation
Housing
The median home value in Washington County is $203,900 (-27.7% vs national). Renters pay a median of $879/mo and the homeownership rate is 74.0%.
Median Home Value Trend
Rankings →Household Type
Education
In Washington County, 26.2% of adults age 25+ hold a bachelor's degree or higher, which is 22.1% below the national average, ranking #1,079 out of 3,222 counties.
Bachelor's Degree or Higher Trend
Rankings →Health & Wellbeing
Life expectancy in Washington County is 78.5 years. 14.5% of adults report poor or fair health and 7.0% lack health insurance. Data from County Health Rankings (2025).
Life Expectancy Trend
Substance Use
15.1% of adults in Washington County smoke , 40.7% are obese , and 24.3% report excessive drinking.
Adult Smoking Trend
Safety
The suicide rate is 16.4 per 100,000. Motor vehicle deaths occur at a rate of 11.6 per 100,000.
Suicide Rate Trend
Families & Children
12.9% of children in Washington County live in poverty . The teen birth rate is 10.6 per 1,000 females age 15–19.
Teen Birth Rate Trend
Civic & Transportation
Voter turnout in Washington County is 73.0%. The mean commute time is 25.1 min, which is 9.2% 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 24.4%. The vote was 37.2% Dem / 61.6% Rep. Compared to 2020, the margin shifted 3.9 toward Republicans .
Vote Share Over Time
About Washington County, Iowa
Washington County, Iowa has a total population of 22,561, making it the 1,743rd most populous county in the United States. The median age in Washington County is 40.7 years, which is 4.6% above the national median of 38.9 years.
The median household income in Washington County is $75,647, which ranks #801 of 3,222 counties nationwide. This is 0.7% above the national median of $75,149. The poverty rate is 8.2%, lower than the national rate of 12.6%. The unemployment rate stands at 2.2%.
The median home value in Washington County is $203,900, 27.7% below the national median. Renters in Washington County pay a median gross rent of $879 per month. The homeownership rate is 74.0%, compared to the national rate of 64.4%.
In Washington County, 26.2% of residents aged 25 and older hold a bachelor's degree or higher, 22.1% below the national average of 33.7%. Health insurance coverage stands at 92.4% of the population. The average commute time for workers is 25.1 min.
Washington County is a diverse community. The largest racial or ethnic group is White (non-Hispanic) at 88.7% of the population, followed by Hispanic or Latino (7.8%) and Two or More Races (2.0%).
All data for Washington County, Iowa 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.