Vandalia is a Republican stronghold. About 19% of voters here vote Democratic and 81% Republican.
About 58% of adults in Vandalia typically vote, near the U.S. average of about 62%. Among adults in Vandalia, ~11% vote Democratic, ~47% Republican, and ~42% 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 5 of 6 neighbors.
Vandalia runs about 43 points more Republican than Montana as a whole.
Why Vandalia leans the way it does
Density, race composition, education, and family structure all sit close to their national averages in Vandalia. The lean here lands roughly where demographic data alone would predict.
Population density and Republican lean
Places with low population density tend to lean Republican; Vandalia, MT sits in the bottom tenth nationally on this measure.
Why turnout in Vandalia looks the way it does
Areas with low high-school completion turn out at lower rates. About 85% of adults in Vandalia have completed high school, below 79% of cities. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- St. Marie, MT R+62
- Glasgow, MT R+45
- Tampico, MT R+61
- Nashua, MT R+56
- Larslan, MT R+24
- Hinsdale, MT R+63
- Fort Peck, MT R+68
- Frazer, MT R+21
- Lustre, MT R+21
- Oswego, MT R+26
Cities with Similar Populations
- Perma, MT R+46
- Perrine, FL Even
- Webster, IL R+62
- Montpelier Station, VA R+23
- Corton, WV R+63
- Bodcaw, AR R+62
- Biscay, MN R+53
- Sweeton Hill, TN R+66
- Newark, GA R+49
- Cowdrey, CO R+34
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Sources and methodology
Precinct-level voting records used to fit the model come from Montana 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.