83520 is a Republican stronghold. About 17% of voters here vote Democratic and 83% Republican.
About 70% of adults in 83520 typically vote, above the U.S. average of about 62%. Among adults in 83520, ~12% vote Democratic, ~58% Republican, and ~30% don't vote. The map below shows estimated turnout by block group.
How 83520 compares
Among zip codes within 15 miles, 83520 is the most Republican-leaning.
83520 runs about 29 points more Republican than Idaho as a whole.
Why 83520 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 83520, not a ranked or complete list of what matters most.
Car-dependent areas vote Republican. About 95% of residents in 83520 drive to work alone, about 22 points above the U.S. average of 74%. Low college attainment predicts Republican voting, and 83520 sits in the bottom quarter (about 17%, below 75% of zip codes).
Population density and Republican lean
Places with low population density tend to lean Republican; 83520, ID sits in the bottom quarter nationally on this measure.
Why turnout in 83520 looks the way it does
Homeowners vote more often than renters. About 90% of households in 83520 own their home, about 10 points above the Idaho average of 79%. 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.