63005 leans slightly Republican by roughly 14 points: about 43% of voters vote Democratic and 57% Republican.
About 81% of adults in 63005 typically vote, above the U.S. average of about 62%. Among adults in 63005, ~35% vote Democratic, ~46% Republican, and ~19% don't vote. The map below shows estimated turnout by block group.
How 63005 compares
Among zip codes within 15 miles, 63005 leans more Republican than 23 of 37 neighbors.
63005 runs about 4 points more Democratic than Missouri as a whole.
Politics vary noticeably by block within 63005. The northwest side is the most Republican-leaning (R+26) and the east side is the least Republican-leaning (R+4), a spread of about 22 points.
Why 63005 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 63005, not a ranked or complete list of what matters most.
Areas with many family households vote Republican. About 85% of households in 63005 are family households, about 19 points above the U.S. average of 67%. Dense places usually vote Democratic, but 63005 runs against that pattern.
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 63005, MO does.
Why turnout in 63005 looks the way it does
Areas with strong routine healthcare access turn out at higher rates. 63005 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 75%, about 15 points above the U.S. average of 60%. Homeowners vote more often than renters, and about 89% of households in 63005 own their home, above 84% of zip codes. High high-school completion lines up with higher turnout, and about 99% of adults in 63005 have completed high school, above 97% 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.