Linn County, Iowa
Located in Iowa, Linn County has a population of 230,004 residents and a median age of 39.0 years, making it the #309 most populous county out of 3,222 nationwide. In terms of economic indicators, the county has a poverty rate of 9.4%. The median home value is $214,300, and the median household income is $77,649, which is 3% above the national median.
Demographics
Linn County has a population of 230,004, making it the #309 most populous county in the US. The median age is 39.0 years, which is 0.3% 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 Linn County is $77,649, ranking #688 out of 3,222 counties — 3.3% above the national median. The poverty rate is 9.4% and unemployment stands at 3.4%.
Median Household Income Trend
Rankings →Income Distribution
Industry of Employment
Occupation
Housing
The median home value in Linn County is $214,300 (-24.0% vs national). Renters pay a median of $945/mo and the homeownership rate is 73.5%.
Median Home Value Trend
Rankings →Household Type
Education
In Linn County, 34.7% of adults age 25+ hold a bachelor's degree or higher, which is 3.1% above the national average, ranking #474 out of 3,222 counties.
Bachelor's Degree or Higher Trend
Rankings →Health & Wellbeing
Life expectancy in Linn County is 78.5 years. 13.9% of adults report poor or fair health and 4.3% lack health insurance. Data from County Health Rankings (2025).
Life Expectancy Trend
Substance Use
14.1% of adults in Linn County smoke , 37.3% are obese , and 23.7% report excessive drinking. The drug overdose death rate is 18.5 per 100,000.
Adult Smoking Trend
Safety
The homicide rate in Linn County is 4.6 per 100,000 and the suicide rate is 18.4 per 100,000. Motor vehicle deaths occur at a rate of 8.4 per 100,000.
Homicide Rate Trend
Families & Children
11.5% of children in Linn County live in poverty and the infant mortality rate is 4.7 per 1,000 live births. The teen birth rate is 12.0 per 1,000 females age 15–19.
Infant Mortality Trend
Civic & Transportation
Voter turnout in Linn County is 75.9%. The mean commute time is 21.3 min, which is 22.8% below the national average.
Voter Turnout Trend
Mean Commute Time Trend
Rankings →Elections
In the 2024 presidential election, Linn County voted Democratic with a margin of 9.9%. The vote was 54.2% Dem / 44.3% Rep. Compared to 2020, the margin shifted 3.8 toward Republicans .
Vote Share Over Time
About Linn County, Iowa
Linn County, Iowa has a total population of 230,004, making it the 309th most populous county in the United States. The median age in Linn County is 39.0 years, which is 0.3% above the national median of 38.9 years.
The median household income in Linn County is $77,649, which ranks #688 of 3,222 counties nationwide. This is 3.3% above the national median of $75,149. The poverty rate is 9.4%, lower than the national rate of 12.6%. The unemployment rate stands at 3.4%.
The median home value in Linn County is $214,300, 24.0% below the national median. Renters in Linn County pay a median gross rent of $945 per month. The homeownership rate is 73.5%, compared to the national rate of 64.4%.
In Linn County, 34.7% of residents aged 25 and older hold a bachelor's degree or higher, 3.1% above the national average of 33.7%. Health insurance coverage stands at 95.9% of the population. The average commute time for workers is 21.3 min.
Linn County is a diverse community. The largest racial or ethnic group is White (non-Hispanic) at 82.4% of the population, followed by Black (non-Hispanic) (5.9%) and Two or More Races (4.7%).
All data for Linn 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.