63020 leans heavily Republican by roughly 50 points: about 25% of voters vote Democratic and 75% Republican.
About 75% of adults in 63020 typically vote, above the U.S. average of about 62%. Among adults in 63020, ~19% vote Democratic, ~56% Republican, and ~25% don't vote. The map below shows estimated turnout by block group.
How 63020 compares
Among zip codes within 15 miles, 63020 leans more Republican than 4 of 13 neighbors.
63020 runs about 32 points more Republican than Missouri as a whole.
Politics vary noticeably by block within 63020. The southeast side is the most Republican-leaning (R+57) and the north side is the least Republican-leaning (R+37), a spread of about 20 points.
Why 63020 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 63020, not a ranked or complete list of what matters most.
Areas with low college attainment vote Republican. About 16% of adults in 63020 hold a bachelor's degree, about 6 points below the Missouri average of 22%.
Preventive-care access and voter turnout
Places with limited routine preventive-care access tend to turn out at a lower rate; 63020, MO sits below the national average on this measure. Dental visits do not drive turnout; the rate reflects income, insurance, and healthcare access, which line up with who votes.
Why turnout in 63020 looks the way it does
Turnout in 63020 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.