Decatur County, Iowa
Located in Iowa, Decatur County has a population of 7,759 residents and a median age of 36.1 years, making it the #2,668 most populous county out of 3,222 nationwide. In terms of economic indicators, the county has a poverty rate of 14.6%. The median home value is $113,900, and the median household income is $59,044, which is 21% below the national median.
Demographics
Decatur County has a population of 7,759, making it the #2,668 most populous county in the US. The median age is 36.1 years, which is 7.2% below 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 Decatur County is $59,044, ranking #2,166 out of 3,222 counties — 21.4% below the national median. The poverty rate is 14.6% and unemployment stands at 1.9%.
Median Household Income Trend
Rankings →Income Distribution
Industry of Employment
Occupation
Housing
The median home value in Decatur County is $113,900 (-59.6% vs national). Renters pay a median of $611/mo and the homeownership rate is 69.7%.
Median Home Value Trend
Rankings →Household Type
Education
In Decatur County, 23.5% of adults age 25+ hold a bachelor's degree or higher, which is 30.2% below the national average, ranking #1,426 out of 3,222 counties.
Bachelor's Degree or Higher Trend
Rankings →Health & Wellbeing
Life expectancy in Decatur County is 76.0 years. 17.0% of adults report poor or fair health and 5.8% lack health insurance. Data from County Health Rankings (2025).
Life Expectancy Trend
Substance Use
18.3% of adults in Decatur County smoke , 38.1% are obese , and 22.9% report excessive drinking.
Adult Smoking Trend
Safety
. Motor vehicle deaths occur at a rate of 20.0 per 100,000.
Motor Vehicle Deaths Trend
Families & Children
25.7% of children in Decatur County live in poverty . The teen birth rate is 13.3 per 1,000 females age 15–19.
Teen Birth Rate Trend
Civic & Transportation
Voter turnout in Decatur County is 62.7%. The mean commute time is 24.0 min, which is 13.0% below the national average.
Voter Turnout Trend
Mean Commute Time Trend
Rankings →Elections
In the 2024 presidential election, Decatur County voted Republican with a margin of 47.0%. The vote was 25.7% Dem / 72.7% Rep. Compared to 2020, the margin shifted 7.7 toward Republicans .
Vote Share Over Time
About Decatur County, Iowa
Decatur County, Iowa has a total population of 7,759, making it the 2,668th most populous county in the United States. The median age in Decatur County is 36.1 years, which is 7.2% below the national median of 38.9 years.
The median household income in Decatur County is $59,044, which ranks #2,166 of 3,222 counties nationwide. This is 21.4% below the national median of $75,149. The poverty rate is 14.6%, higher than the national rate of 12.6%. The unemployment rate stands at 1.9%.
The median home value in Decatur County is $113,900, 59.6% below the national median. Renters in Decatur County pay a median gross rent of $611 per month. The homeownership rate is 69.7%, compared to the national rate of 64.4%.
In Decatur County, 23.5% of residents aged 25 and older hold a bachelor's degree or higher, 30.2% below the national average of 33.7%. Health insurance coverage stands at 92.4% of the population. The average commute time for workers is 24.0 min.
Decatur County is a diverse community. The largest racial or ethnic group is White (non-Hispanic) at 90.2% of the population, followed by Hispanic or Latino (3.5%) and Two or More Races (3.4%).
All data for Decatur 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.