63131 is a true toss-up. About 48% of voters here vote Democratic and 52% Republican.
About 86% of adults in 63131 typically vote, above the U.S. average of about 62%. Among adults in 63131, ~41% vote Democratic, ~45% Republican, and ~14% don't vote. The map below shows estimated turnout by block group.
How 63131 compares
Among zip codes within 15 miles, 63131 leans more Republican than 50 of 66 neighbors.
63131 runs about 14 points more Democratic than Missouri as a whole.
Politics vary noticeably by block within 63131. The northeast side runs the most Democratic (D+7) and the east side runs the most Republican (R+11), a spread of about 18 points.
Why 63131 leans the way it does
Density, race composition, education, and family structure all sit close to their national averages in 63131. The lean here lands roughly where demographic data alone would predict.
High-school completion, uninsured rate, and voter turnout
Places that combine high-school-completion-heavy adults and a low uninsured rate tend to turn out at a higher rate, as 63131, MO does.
Why turnout in 63131 looks the way it does
Areas with strong routine healthcare access turn out at higher rates. 63131 is in the top quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. The dental-visit rate here is about 76%, about 16 points above the U.S. average of 60%. Homeowners vote more often than renters, and about 92% of households in 63131 own their home, compared to around 73% in nearby zip codes. High high-school completion lines up with higher turnout, and about 99% of adults in 63131 have completed high school, 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.