83615 is a Republican stronghold. About 24% of voters here vote Democratic and 76% Republican.
About 65% of adults in 83615 typically vote, near the U.S. average of about 62%. Among adults in 83615, ~16% vote Democratic, ~50% Republican, and ~34% don't vote. The map below shows estimated turnout by block group.
How 83615 compares
83615 runs about 15 points more Republican than Idaho as a whole.
Why 83615 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 83615, not a ranked or complete list of what matters most.
Areas with many family households vote Republican. About 77% of households in 83615 are family households, about 10 points above the U.S. average of 67%. Rural areas vote Republican, and 83615 sits in the bottom quarter on density (about 6%, below 76% of zip codes).
Paved land cover and Republican lean
Places with little paved surface tend to lean Republican; 83615, 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 83615 looks the way it does
Homeowners vote more often than renters. About 91% of households in 83615 own their home, about 11 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.