Lewis County is a Republican stronghold. About 20% of voters here vote Democratic and 80% Republican.
About 74% of adults in Lewis County typically vote, above the U.S. average of about 62%. Among adults in Lewis County, ~15% vote Democratic, ~59% Republican, and ~26% don't vote. The map below shows estimated turnout by block group.
How Lewis County compares
Among counties within 50 miles, Lewis County leans more Republican than 7 of 12 neighbors.
Lewis County runs about 41 points more Republican than Missouri as a whole.
Politics vary noticeably by city within Lewis County. The southwest side is the most Republican-leaning (R+74) and the east side is the least Republican-leaning (R+45), a spread of about 29 points.
Why Lewis 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 Lewis County, not a ranked or complete list of what matters most.
Areas with a high white share and below-average college attainment vote Republican. In Lewis County, about 92% of residents are non-Hispanic white, about 20 points above the U.S. average of 72%; about 17% of adults hold a bachelor's degree, about 11 points below the U.S. average of 28%.
Population density and Republican lean
Places with low population density tend to lean Republican; Lewis County, MO sits below the national average on this measure.
Why turnout in Lewis County looks the way it does
Turnout in Lewis County sits close to the national pattern. Routine healthcare access, homeownership, education, and food security all land near their national averages here. Learn more about the findings and methodology on the political spectrum map.
Nearby Counties
- Adams County, IL R+40
- Clark County, MO R+60
- Marion County, MO R+44
- Knox County, MO R+66
- Shelby County, MO R+65
- Hancock County, IL R+45
- Lee County, IA R+27
- Ralls County, MO R+62
- Scotland County, MO R+64
- Monroe County, MO R+57
Counties with Similar Populations
- Keokuk County, IA R+47
- Marshall County, KS R+53
- Franklin County, IA R+43
- Perry County, AR R+62
- Nome Census Area, AK D+23
- Madison Parish, LA D+6
- Ochiltree County, TX R+58
- Carroll County, MS R+40
- Jackson County, MN R+42
- Yuma County, CO R+60
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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.