Weldon Spring Heights leans heavily Republican by roughly 32 points: about 34% of voters vote Democratic and 66% Republican.
About 89% of adults in Weldon Spring Heights typically vote, above the U.S. average of about 62%. Among adults in Weldon Spring Heights, ~30% vote Democratic, ~59% Republican, and ~11% don't vote. The map below shows estimated turnout by block group.
How Weldon Spring Heights compares
Among cities within 25 miles, Weldon Spring Heights leans more Republican than 103 of 157 neighbors.
Weldon Spring Heights runs about 13 points more Republican than Missouri as a whole.
Politics vary noticeably by neighborhood within Weldon Spring Heights. The northeast side is the most Republican-leaning (R+32) and the west side is the least Republican-leaning (R+9), a spread of about 24 points.
Why Weldon Spring Heights leans the way it does
This analysis examined 14,881 data points per city to find what predicts political lean and turnout. The items below are a few correlations that stood out for Weldon Spring Heights, not a ranked or complete list of what matters most.
Weldon Spring Heights votes Republican even though it is densely developed (about 63%, far above the Missouri average of 22%). State and regional patterns outweigh the Democratic lean that density usually predicts here. A high family-household share predicts Republican voting, and about 87% of households in Weldon Spring Heights are family households, above 98% of cities.
Preventive-care access and voter turnout
Places with strong routine preventive-care access tend to turn out at a higher rate; Weldon Spring Heights, MO sits in the top tenth nationally 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 Weldon Spring Heights looks the way it does
Areas with strong routine healthcare access turn out at higher rates. Weldon Spring Heights 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 71%, about 11 points above the U.S. average of 60%. High high-school completion lines up with higher turnout, and about 97% of adults in Weldon Spring Heights have completed high school, above 89% of cities. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Weldon Spring, MO R+23
- Cottleville, MO R+16
- Dardenne Prairie, MO R+17
- O'fallon, MO R+16
- St. Peters, MO R+9
- Clarkson Valley, MO R+22
- Defiance, MO R+42
- Lake St. Louis, MO R+16
- Wildwood, MO R+16
- Matson, MO R+43
Cities with Similar Populations
- Aiken, TX R+66
- Perrys Mill, AL R+18
- New Era, LA R+86
- St. Stephens, NE R+69
- Curtin, WV R+66
- Linden Hall, PA D+16
- Doyleville, CO R+12
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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.