Weldon Spring leans Republican by roughly 22 points: about 39% of voters vote Democratic and 61% Republican.
About 90% of adults in Weldon Spring typically vote, above the U.S. average of about 62%. Among adults in Weldon Spring, ~35% vote Democratic, ~55% Republican, and ~10% don't vote. The map below shows estimated turnout by block group.
How Weldon Spring compares
Among cities within 25 miles, Weldon Spring leans more Republican than 100 of 156 neighbors.
Weldon Spring runs about 4 points more Republican than Missouri as a whole.
Politics vary noticeably by neighborhood within Weldon Spring. The southeast side is the most Republican-leaning (R+35) and the west side is the least Republican-leaning (R+12), a spread of about 23 points.
Why Weldon Spring 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, not a ranked or complete list of what matters most.
Weldon Spring votes Republican even though it is densely developed (about 68%, 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 81% of households in Weldon Spring are family households, above 91% of cities.
Cancer-screening access and voter turnout
Places with high colon-cancer-screening access tend to turn out at a higher rate; Weldon Spring, MO sits in the top quarter nationally on this measure. Cancer screening does not drive turnout; it reflects income, insurance, and healthcare access.
Why turnout in Weldon Spring looks the way it does
Areas with strong routine healthcare access turn out at higher rates. Weldon Spring 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 99% of adults in Weldon Spring have completed high school, above 97% of cities. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Cottleville, MO R+16
- Weldon Spring Heights, MO R+31
- St. Peters, MO R+9
- Dardenne Prairie, MO R+17
- O'fallon, MO R+16
- Clarkson Valley, MO R+22
- St. Charles, MO R+6
- Chesterfield, MO D+5
- Wildwood, MO R+16
- Lake St. Louis, MO R+16
Cities with Similar Populations
- McGregor, FL R+21
- Palmview South, TX R+5
- Weiser, ID R+52
- Springs, NY D+20
- East Taunton, MA R+11
- Garrett, IN R+47
- Hertford, NC R+33
- Center Moriches, NY R+22
- Boxford, MA D+16
- Rutledge, TN R+71
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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.