Henry County is a Republican stronghold. About 23% of voters here vote Democratic and 77% Republican.
About 80% of adults in Henry County typically vote, above the U.S. average of about 62%. Among adults in Henry County, ~18% vote Democratic, ~61% Republican, and ~21% 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 4 of 10 neighbors.
Henry County runs about 36 points more Republican than Missouri as a whole.
Politics vary noticeably by city within Henry County. The southwest side is the most Republican-leaning (R+67) and the northeast side is the least Republican-leaning (R+57), a spread of about 10 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.
Areas with low college attainment vote Republican. About 16% of adults in Henry County hold a bachelor's degree, about 6 points below the Missouri average of 22%.
Park access and Republican lean
Places with low park coverage tend to lean Republican; Henry County, MO 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 Henry County looks the way it does
Turnout in Henry County sits close to the national pattern. Learn more about the findings and methodology on the political spectrum map.
Nearby Counties
- St. Clair County, MO R+64
- Benton County, MO R+60
- Johnson County, MO R+35
- Pettis County, MO R+43
- Bates County, MO R+60
- Hickory County, MO R+62
- Cedar County, MO R+65
- Cass County, MO R+32
- Lafayette County, MO R+51
- Morgan County, MO R+63
Counties with Similar Populations
- Seward County, KS R+27
- Randolph County, AL R+59
- Wyandot County, OH R+53
- Martin County, NC R+4
- Jo Daviess County, IL R+18
- Scott County, TN R+70
- Prince Edward County, VA D+7
- Putnam County, GA R+26
- Colusa County, CA R+20
- Anson County, NC Even
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Sources and methodology
Precinct-level voting records used to fit the model come from Missouri 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.