Vandalia leans heavily Republican by roughly 46 points: about 27% of voters vote Democratic and 73% Republican.
About 56% of adults in Vandalia typically vote, below the U.S. average of about 62%. Among adults in Vandalia, ~15% vote Democratic, ~41% Republican, and ~44% don't vote. The map below shows estimated turnout by block group.
How Vandalia compares
Among cities within 25 miles, Vandalia leans more Republican than 3 of 44 neighbors.
Vandalia runs about 28 points more Republican than Missouri as a whole.
Politics vary noticeably by neighborhood within Vandalia. The southeast side is the most Republican-leaning (R+70) and the north side is the least Republican-leaning (R+41), a spread of about 29 points.
Why Vandalia 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 Vandalia, not a ranked or complete list of what matters most.
Car-dependent areas vote Republican. About 88% of residents in Vandalia drive to work alone, about 14 points above the U.S. average of 74%. Low college attainment predicts Republican voting, and Vandalia sits in the bottom quarter (about 8%, below 96% of cities).
Never-married share, developed land, and voter turnout
Places that combine a never-married-heavy adult population and a heavily developed built environment tend to turn out at a lower rate, as Vandalia, MO does.
Why turnout in Vandalia looks the way it does
Areas with low high-school completion turn out at lower rates. About 83% of adults in Vandalia have completed high school, about 7 points below the U.S. average of 90%. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Farber, MO R+64
- New Harmony, MO R+69
- Curryville, MO R+71
- Madisonville, MO R+70
- Gazette, MO R+71
- Laddonia, MO R+61
- Farmer, MO R+71
- Scotts Corner, MO R+66
- Middletown, MO R+69
- Perry, MO R+59
Cities with Similar Populations
- Gravois Mills, MO R+56
- Wurtsboro, NY R+20
- Pamplico, SC R+28
- Rock Island, TN R+69
- Northfield, MA D+16
- Fort Branch, IN R+44
- Blowing Rock, NC D+3
- Zolfo Springs, FL R+59
- Bedford, KY R+57
- Standish, MI R+38
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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.