63043 leans Democratic by roughly 20 points: about 60% of voters vote Democratic and 40% Republican.
About 64% of adults in 63043 typically vote, near the U.S. average of about 62%. Among adults in 63043, ~38% vote Democratic, ~26% Republican, and ~36% don't vote. The map below shows estimated turnout by block group.
How 63043 compares
Among zip codes within 15 miles, 63043 leans more Democratic than 22 of 59 neighbors.
63043 runs about 39 points more Democratic than Missouri as a whole. Missouri leans Republican overall, while 63043 is one of the few Democratic-leaning pockets.
Politics vary noticeably by block within 63043. The southeast side runs the most Democratic (D+33) and the northwest side runs the most Republican (Even), a spread of about 34 points.
Why 63043 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 63043, not a ranked or complete list of what matters most.
Dense areas vote Democratic. About 91% of residents in 63043 live in densely developed areas, about 55 points above the U.S. average of 36%. High college attainment predicts Democratic voting, and 63043 sits in the top quarter (about 46%, above 86% of zip codes). 63043 runs against the grain of Missouri, a Democratic-leaning pocket in a Republican-leaning state.
Population density and Democratic lean
Places with high population density tend to lean Democratic; 63043, MO sits in the top quarter nationally on this measure.
Why turnout in 63043 looks the way it does
Turnout in 63043 sits close to the national pattern. Routine healthcare access, homeownership, education, and food security all land near their national averages here. 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.