63851 leans slightly Democratic by roughly 10 points: about 55% of voters vote Democratic and 45% Republican.
About 57% of adults in 63851 typically vote, near the U.S. average of about 62%. Among adults in 63851, ~31% vote Democratic, ~26% Republican, and ~43% don't vote. The map below shows estimated turnout by block group.
How 63851 compares
Among zip codes within 15 miles, 63851 is the most Democratic-leaning.
63851 runs about 29 points more Democratic than Missouri as a whole. Missouri leans Republican overall, while 63851 is one of the few Democratic-leaning pockets.
Politics vary noticeably by block within 63851. The northwest side runs the most Democratic (D+51) and the northeast side runs the most Republican (R+49), a spread of about 100 points.
Why 63851 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 63851, not a ranked or complete list of what matters most.
Areas with many never-married adults vote Democratic. About 45% of adults in 63851 have never been married, well above similar-sized zip codes (around 29%). 63851 runs against the grain of Missouri, a Democratic-leaning pocket in a Republican-leaning state.
Walkability and Democratic lean
Places with a highly walkable street grid tend to lean Democratic; 63851, MO sits in the top quarter nationally on this measure. A walkable street grid does not change how people vote; it mostly reflects how urban a place is.
Why turnout in 63851 looks the way it does
Areas with limited routine healthcare access turn out at lower rates. 63851 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 39%, about 19 points below the Missouri average of 57%. Renters vote less often than owners, and about 52% of households in 63851 rent, compared to around 33% in nearby zip codes. High food insecurity lines up with lower turnout, and about 40% of adults in 63851 report food insecurity, above 98% of zip codes. 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.