59315 is a Republican stronghold. About 13% of voters here vote Democratic and 87% Republican.
About 76% of adults in 59315 typically vote, above the U.S. average of about 62%. Among adults in 59315, ~10% vote Democratic, ~66% Republican, and ~24% don't vote. The map below shows estimated turnout by block group.
How 59315 compares
59315 runs about 55 points more Republican than Montana as a whole.
Why 59315 leans the way it does
This analysis examined 14,881 data points per zip code to find what predicts political lean and turnout. The items below are a few correlations that stood out for 59315, not a ranked or complete list of what matters most.
Rural areas with a high white share vote Republican. 59315 sits in the bottom quarter on density and about 94% of residents are non-Hispanic white, about 11 points above the Montana average of 83%.
Population density and Republican lean
Places with low population density tend to lean Republican; 59315, MT sits in the bottom tenth nationally on this measure.
Why turnout in 59315 looks the way it does
Areas with strong routine healthcare access turn out at higher rates. 59315 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 69%, about 9 points above the U.S. average of 60%. Learn more about the findings and methodology on the political spectrum map.
Nearby Zip Codes
Zip Codes with Similar Populations
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.