63091 is a Republican stronghold. About 18% of voters here vote Democratic and 82% Republican.
About 71% of adults in 63091 typically vote, above the U.S. average of about 62%. Among adults in 63091, ~13% vote Democratic, ~58% Republican, and ~29% don't vote. The map below shows estimated turnout by block group.
How 63091 compares
Among zip codes within 15 miles, 63091 leans more Republican than 4 of 5 neighbors.
63091 runs about 45 points more Republican than Missouri as a whole.
Why 63091 leans the way it does
This analysis examined 14,881 data points per zip code to find what predicts political lean and turnout. The items below are a few correlations that stood out for 63091, not a ranked or complete list of what matters most.
Rural areas vote Republican. About 6% of residents in 63091 live in densely developed areas, about 16 points below the Missouri average of 22%. A high white share with below-average college attainment predicts Republican voting, and 63091 fits that profile on both counts. A high family-household share predicts Republican voting, and about 80% of households in 63091 are family households, above 91% of zip codes.
Paved land cover and Republican lean
Places with little paved surface tend to lean Republican; 63091, MO sits in the bottom quarter nationally on this measure. Paved ground does not change how people vote; it mostly reflects how urban and built-up a place is.
Why turnout in 63091 looks the way it does
Turnout in 63091 sits close to the national pattern. Learn more about the findings and methodology on the political spectrum map.
Nearby Zip Codes
Zip Codes with Similar Populations
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.