83539 is a Republican stronghold. About 22% of voters here vote Democratic and 78% Republican.
About 58% of adults in 83539 typically vote, near the U.S. average of about 62%. Among adults in 83539, ~13% vote Democratic, ~45% Republican, and ~42% don't vote. The map below shows estimated turnout by block group.
How 83539 compares
83539 sits in a sparsely populated area with few comparable zip codes nearby.
83539 runs about 20 points more Republican than Idaho as a whole.
Politics vary noticeably by block within 83539. The southwest side is the most Republican-leaning (R+61) and the east side is the least Republican-leaning (R+24), a spread of about 37 points.
Why 83539 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 83539, not a ranked or complete list of what matters most.
Areas with low college attainment vote Republican. About 14% of adults in 83539 hold a bachelor's degree, about 12 points below the Idaho average of 26%.
Paved land cover and Republican lean
Places with little paved surface tend to lean Republican; 83539, ID 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 83539 looks the way it does
High-crime urban areas turn out at lower rates, mostly because the housing stress common in those areas makes voting harder. 83539 sits in the top 15% nationally on a violent-crime measure. See CrimeGrade for more details. 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 Idaho 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.