Grundy County, Iowa
Located in Iowa, Grundy County has a population of 12,384 residents and a median age of 41.9 years, making it the #2,331 most populous county out of 3,222 nationwide. In terms of economic indicators, the county has a poverty rate of 6.5%. The median home value is $198,800, and the median household income is $87,205, which is 16% above the national median.
Demographics
Grundy County has a population of 12,384, making it the #2,331 most populous county in the US. The median age is 41.9 years, which is 7.7% 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 Grundy County is $87,205, ranking #367 out of 3,222 counties — 16.0% above the national median. The poverty rate is 6.5% and unemployment stands at 2.0%.
Median Household Income Trend
Rankings →Income Distribution
Industry of Employment
Occupation
Housing
The median home value in Grundy County is $198,800 (-29.5% vs national). Renters pay a median of $774/mo and the homeownership rate is 84.5%.
Median Home Value Trend
Rankings →Household Type
Education
In Grundy County, 27.8% of adults age 25+ hold a bachelor's degree or higher, which is 17.4% below the national average, ranking #940 out of 3,222 counties.
Bachelor's Degree or Higher Trend
Rankings →Health & Wellbeing
Life expectancy in Grundy County is 79.3 years. 13.3% of adults report poor or fair health and 4.3% lack health insurance. Data from County Health Rankings (2025).
Life Expectancy Trend
Substance Use
15.8% of adults in Grundy County smoke , 38.7% are obese , and 27.3% report excessive drinking.
Adult Smoking Trend
Safety
The suicide rate is 16.6 per 100,000. Motor vehicle deaths occur at a rate of 12.8 per 100,000.
Suicide Rate Trend
Families & Children
6.4% of children in Grundy County live in poverty . The teen birth rate is 8.0 per 1,000 females age 15–19.
Teen Birth Rate Trend
Civic & Transportation
Voter turnout in Grundy County is 77.5%. The mean commute time is 25.2 min, which is 8.9% below the national average.
Voter Turnout Trend
Mean Commute Time Trend
Rankings →Elections
In the 2024 presidential election, Grundy County voted Republican with a margin of 41.8%. The vote was 28.3% Dem / 70.1% Rep. Compared to 2020, the margin shifted 4.4 toward Republicans .
Vote Share Over Time
About Grundy County, Iowa
Grundy County, Iowa has a total population of 12,384, making it the 2,331st most populous county in the United States. The median age in Grundy County is 41.9 years, which is 7.7% above the national median of 38.9 years.
The median household income in Grundy County is $87,205, which ranks #367 of 3,222 counties nationwide. This is 16.0% above the national median of $75,149. The poverty rate is 6.5%, lower than the national rate of 12.6%. The unemployment rate stands at 2.0%.
The median home value in Grundy County is $198,800, 29.5% below the national median. Renters in Grundy County pay a median gross rent of $774 per month. The homeownership rate is 84.5%, compared to the national rate of 64.4%.
In Grundy County, 27.8% of residents aged 25 and older hold a bachelor's degree or higher, 17.4% below the national average of 33.7%. Health insurance coverage stands at 96.2% of the population. The average commute time for workers is 25.2 min.
Grundy County is a diverse community. The largest racial or ethnic group is White (non-Hispanic) at 94.9% of the population, followed by Hispanic or Latino (1.8%) and Two or More Races (1.1%).
All data for Grundy 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.