Cottleville leans Republican by roughly 16 points: about 42% of voters vote Democratic and 58% Republican.
About 87% of adults in Cottleville typically vote, above the U.S. average of about 62%. Among adults in Cottleville, ~37% vote Democratic, ~50% Republican, and ~13% don't vote. The map below shows estimated turnout by block group.
How Cottleville compares
Among cities within 25 miles, Cottleville leans more Republican than 92 of 158 neighbors.
Politically, Cottleville sits close to the rest of Missouri.
Politics vary noticeably by neighborhood within Cottleville. The southeast side is the most Republican-leaning (R+24) and the east side is the least Republican-leaning (R+9), a spread of about 15 points.
Why Cottleville 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 Cottleville, not a ranked or complete list of what matters most.
Cottleville votes Republican even though it is densely developed (about 87%, far above the Missouri average of 22%). State and regional patterns outweigh the Democratic lean that density usually predicts here. A high family-household share predicts Republican voting, and about 76% of households in Cottleville are family households, above 80% of cities.
Preventive-care access and voter turnout
Places with strong routine preventive-care access tend to turn out at a higher rate; Cottleville, MO sits in the top quarter nationally on this measure. Dental visits do not drive turnout; the rate reflects income, insurance, and healthcare access, which line up with who votes.
Why turnout in Cottleville looks the way it does
Areas with strong routine healthcare access turn out at higher rates. Cottleville 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 69%, about 9 points above the U.S. average of 60%. High high-school completion lines up with higher turnout, and about 98% of adults in Cottleville have completed high school, above 93% of cities. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Weldon Spring, MO R+23
- St. Peters, MO R+9
- Weldon Spring Heights, MO R+31
- O'fallon, MO R+16
- Dardenne Prairie, MO R+17
- St. Charles, MO R+6
- Lake St. Louis, MO R+16
- St. Paul, MO R+32
- Kampville, MO R+43
Cities with Similar Populations
- Glenmoore, PA Even
- Helena Valley West Central, MT R+16
- Honea Path, SC R+63
- Wernersville, PA R+19
- Sewickley, PA D+15
- Cornelia, GA R+50
- Bel Aire, KS R+10
- Harahan, LA R+29
- Madison, FL D+5
- Catlettsburg, KY R+53
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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.