83321 is a Republican stronghold. About 15% of voters here vote Democratic and 85% Republican.
About 62% of adults in 83321 typically vote, near the U.S. average of about 62%. Among adults in 83321, ~9% vote Democratic, ~53% Republican, and ~38% don't vote. The map below shows estimated turnout by block group.
How 83321 compares
83321 sits in a sparsely populated area with few comparable zip codes nearby.
83321 runs about 35 points more Republican than Idaho as a whole.
Why 83321 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 83321, not a ranked or complete list of what matters most.
Areas with many family households vote Republican. About 76% of households in 83321 are family households, about 9 points above the U.S. average of 67%.
Walkability and Republican lean
Places with a low walkability score tend to lean Republican; 83321, ID sits in the bottom quarter nationally on this measure. A walkable street grid does not change how people vote; it mostly reflects how urban a place is.
Why turnout in 83321 looks the way it does
Areas with limited routine healthcare access turn out at lower rates. 83321 is in the bottom quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. Renters vote less often than owners, and about 34% of households in 83321 rent, above 81% of zip codes. Low high-school completion lines up with lower turnout, and about 76% of adults in 83321 have completed high school, below 95% 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 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.