Henry County leans heavily Republican by roughly 32 points: about 34% of voters vote Democratic and 66% Republican.
About 85% of adults in Henry County typically vote, above the U.S. average of about 62%. Among adults in Henry County, ~29% vote Democratic, ~56% Republican, and ~15% don't vote. The map below shows estimated turnout by block group.
How Henry County compares
Among counties within 50 miles, Henry County leans more Republican than 7 of 17 neighbors.
Henry County runs about 18 points more Republican than Iowa as a whole.
Politics vary noticeably by city within Henry County. The southwest side is the most Republican-leaning (R+48) and the south side is the least Republican-leaning (R+32), a spread of about 16 points.
Why Henry County leans the way it does
This analysis examined 14,881 data points per county to find what predicts political lean and turnout. The items below are a few correlations that stood out for Henry County, not a ranked or complete list of what matters most.
Car-dependent areas vote Republican. About 82% of residents in Henry County drive to work alone, about 8 points above the U.S. average of 74%.
Housing overcrowding and voter turnout
Places with low overcrowding tend to turn out at a higher rate; Henry County, IA sits in the bottom tenth nationally on this measure.
Why turnout in Henry County looks the way it does
Areas with strong routine healthcare access turn out at higher rates. Henry County is in the top quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. The dental-visit rate here is about 67%, about 7 points above the U.S. average of 60%. Learn more about the findings and methodology on the political spectrum map.
Nearby Counties
- Louisa County, IA R+37
- Jefferson County, IA R+4
- Des Moines County, IA R+8
- Van Buren County, IA R+55
- Washington County, IA R+33
- Lee County, IA R+27
- Henderson County, IL R+41
- Clark County, MO R+60
- Keokuk County, IA R+47
- Muscatine County, IA R+16
Counties with Similar Populations
- Fulton County, IN R+51
- Jay County, IN R+58
- Woodward County, OK R+63
- Lincoln County, WV R+65
- Greene County, NC R+15
- Uinta County, WY R+62
- Breckinridge County, KY R+58
- Carbon County, UT R+56
- Greene County, VA R+26
- Colorado County, TX R+42
Sources and methodology
Precinct-level voting records used to fit the model come from Iowa Secretary of State, Elections, distributed by the Voting and Election Science Team. Demographic inputs come from the U.S. Census Bureau (ACS 5-year estimates and the 2020 Decennial Census). Health and environmental inputs come from the CDC (PLACES and the Environmental Justice Index). Land cover comes from the USGS and EPA. Election-day and lead-up weather come from PRISM 4km daily grids and the NOAA Global Historical Climatology Network. Mail-voting and election-administration patterns come from the MIT Election Lab's Survey of the Performance of American Elections. Block-group crime detail comes from CrimeGrade. Internet data and modeling support provided by ISPreports.org.
Modeling and analysis by the BestNeighborhood data science team. Full methodology and findings: political spectrum map.
Methodology reviewed by the BestNeighborhood data team. Last updated May 2026.