63033 is a Democratic stronghold. About 84% of voters here vote Democratic and 16% Republican.
About 70% of adults in 63033 typically vote, above the U.S. average of about 62%. Among adults in 63033, ~59% vote Democratic, ~11% Republican, and ~30% don't vote. The map below shows estimated turnout by block group.
How 63033 compares
Among zip codes within 15 miles, 63033 leans more Democratic than 42 of 65 neighbors.
63033 runs about 87 points more Democratic than Missouri as a whole. Missouri leans Republican overall, while 63033 is one of the few Democratic-leaning pockets.
Politics vary noticeably by block within 63033. The southeast side is the most Democratic-leaning (D+84) and the west side is the least Democratic-leaning (D+45), a spread of about 39 points.
Why 63033 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 63033, not a ranked or complete list of what matters most.
Density combined with diversity predicts Democratic voting. Non-Hispanic white share in 63033 is about 21%, about 51 points below the U.S. average of 72%. A high never-married share predicts Democratic voting, and about 38% of adults in 63033 have never been married, above 84% of zip codes. 63033 runs against the grain of Missouri, a Democratic-leaning pocket in a Republican-leaning state.
Paved land cover and Democratic lean
Places with extensive paved surfaces tend to lean Democratic; 63033, MO sits in the top quarter nationally on this measure. Paved ground does not change how people vote; it mostly reflects how urban and built-up a place is.
Why turnout in 63033 looks the way it does
Turnout in 63033 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.