59820 leans heavily Republican by roughly 36 points: about 32% of voters vote Democratic and 68% Republican.
About 63% of adults in 59820 typically vote, near the U.S. average of about 62%. Among adults in 59820, ~20% vote Democratic, ~43% Republican, and ~37% don't vote. The map below shows estimated turnout by block group.
How 59820 compares
59820 sits in a sparsely populated area with few comparable zip codes nearby.
59820 runs about 16 points more Republican than Montana as a whole.
Politics vary noticeably by block within 59820. The west side is the most Republican-leaning (R+51) and the southeast side is the least Republican-leaning (R+16), a spread of about 35 points.
Why 59820 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 59820, not a ranked or complete list of what matters most.
Rural areas vote Republican. About 2% of residents in 59820 live in densely developed areas, about 11 points below the Montana average of 13%.
High-school completion, developed land, and voter turnout
Places that combine high-school-completion-heavy adults and a rural land-use pattern tend to turn out at a higher rate, as 59820, MT does.
Why turnout in 59820 looks the way it does
Homeowners vote more often than renters. About 89% of households in 59820 own their home, about 12 points above the Montana average of 77%. High high-school completion lines up with higher turnout, and about 97% of adults in 59820 have completed high school, above 88% of zip codes. 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.