63821 is a Republican stronghold. About 14% of voters here vote Democratic and 86% Republican.
About 69% of adults in 63821 typically vote, above the U.S. average of about 62%. Among adults in 63821, ~10% vote Democratic, ~59% Republican, and ~31% don't vote. The map below shows estimated turnout by block group.
How 63821 compares
Among zip codes within 15 miles, 63821 leans more Republican than 6 of 7 neighbors.
63821 runs about 53 points more Republican than Missouri as a whole.
Why 63821 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 63821, not a ranked or complete list of what matters most.
Car-dependent areas vote Republican. About 93% of residents in 63821 drive to work alone, about 19 points above the U.S. average of 74%. Low college attainment predicts Republican voting, and 63821 sits in the bottom quarter (about 10%, below 94% of zip codes).
Population density and Republican lean
Places with low population density tend to lean Republican; 63821, MO sits near the national average on this measure.
Why turnout in 63821 looks the way it does
Areas with limited routine healthcare access turn out at lower rates. 63821 is in the bottom quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. The dental-visit rate here is about 44%, about 13 points below the Missouri average of 57%. 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.