Henderson leans heavily Republican by roughly 48 points: about 26% of voters vote Democratic and 74% Republican.
About more than 99% of adults in Henderson typically vote, above the U.S. average of about 62%. Among adults in Henderson, ~27% vote Democratic, ~76% Republican, and ~-3% don't vote. The map below shows estimated turnout by block group.
How Henderson compares
Among cities within 25 miles, Henderson leans more Republican than 22 of 37 neighbors.
Henderson runs about 35 points more Republican than Iowa as a whole.
Why Henderson leans the way it does
This analysis examined 14,881 data points per city to find what predicts political lean and turnout. The items below are a few correlations that stood out for Henderson, not a ranked or complete list of what matters most.
Rural areas with a high white share vote Republican. Henderson sits in the bottom quarter on density and about 95% of residents are non-Hispanic white, about 23 points above the U.S. average of 72%.
Park access and Republican lean
Places with low park coverage tend to lean Republican; Henderson, IA sits in the bottom quarter nationally on this measure. Park access does not change how people vote; it tends to track denser, higher-income areas.
Why turnout in Henderson looks the way it does
Areas with strong routine healthcare access turn out at higher rates. Henderson 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 68%, about 8 points above the U.S. average of 60%. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Macedonia, IA R+50
- Carson, IA R+45
- Wales, IA R+50
- Hastings, IA R+49
- Emerson, IA R+46
- Silver City, IA R+41
- Treynor, IA R+45
- Hawthorne, IA R+51
- Malvern, IA R+39
- Stennett, IA R+49
Cities with Similar Populations
- Mellette, OK R+65
- Launiupoko, HI D+21
- Paynes Creek, CA R+39
- McKinneysburg, KY R+63
- Mount Lebanon, TN R+75
- Darlington, ID R+71
- Rathbun, PA R+55
- Pauwela, HI D+14
- Mavity, KY R+57
- Stone Arabia, NY R+43
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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.