63120 is a Democratic stronghold. About 93% of voters here vote Democratic and 7% Republican.
About 52% of adults in 63120 typically vote, below the U.S. average of about 62%. Among adults in 63120, ~48% vote Democratic, ~4% Republican, and ~48% don't vote. The map below shows estimated turnout by block group.
How 63120 compares
Among zip codes within 15 miles, 63120 leans more Democratic than 65 of 70 neighbors.
63120 runs about 104 points more Democratic than Missouri as a whole. Missouri leans Republican overall, while 63120 is one of the few Democratic-leaning pockets.
Why 63120 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 63120, not a ranked or complete list of what matters most.
Dense areas vote Democratic. More than 99% of residents in 63120 live in densely developed areas, about 64 points above the U.S. average of 36%. A high never-married share predicts Democratic voting, and about 58% of adults in 63120 have never been married, above 98% of zip codes. 63120 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; 63120, MO sits in the top tenth 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 63120 looks the way it does
Areas with limited routine healthcare access turn out at lower rates. 63120 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 38%, about 19 points below the Missouri average of 57%. Renters vote less often than owners, and about 50% of households in 63120 rent, about 25 points above the U.S. average of 25%. High food insecurity lines up with lower turnout, and about 47% of adults in 63120 report food insecurity, in the top fraction 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.