Basin leans heavily Republican by roughly 38 points: about 31% of voters vote Democratic and 69% Republican.
About 66% of adults in Basin typically vote, near the U.S. average of about 62%. Among adults in Basin, ~21% vote Democratic, ~46% Republican, and ~33% don't vote. The map below shows estimated turnout by block group.
How Basin compares
Among cities within 25 miles, Basin leans more Republican than 10 of 14 neighbors.
Basin runs about 18 points more Republican than Montana as a whole.
Why Basin 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 Basin, not a ranked or complete list of what matters most.
Rural areas vote Republican. About 3% of residents in Basin live in densely developed areas, about 10 points below the Montana average of 13%.
Paved land cover and Republican lean
Places with little paved surface tend to lean Republican; Basin, MT sits in the bottom 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 Basin looks the way it does
Areas with high high-school completion turn out at higher rates. About 96% of adults in Basin have completed high school, about 6 points above the U.S. average of 90%. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Boulder, MT R+38
- Jefferson City, MT R+37
- Butte-Silver Bow, MT R+45
- Rimini, MT R+16
- Clancy, MT R+26
- Elliston, MT R+51
- Walkerville, MT R+13
- Centerville, MT D+4
- Butte, MT Even
Cities with Similar Populations
- Wadsworth, TX R+67
- Tendal, LA R+76
- Svea, FL R+69
- Chicota, TX R+51
- Strandquist, MN R+54
- Ribot, PA R+66
- Davilla, TX R+71
- West Sullivan, MO R+64
- Clemons, IA R+44
- Parsonville, NC R+66
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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.