83320 is a Republican stronghold. About 23% of voters here vote Democratic and 77% Republican.
About 35% of adults in 83320 typically vote, below the U.S. average of about 62%. Among adults in 83320, ~8% vote Democratic, ~27% Republican, and ~65% don't vote. The map below shows estimated turnout by block group.
How 83320 compares
83320 runs about 19 points more Republican than Idaho as a whole.
Politics vary noticeably by block within 83320. The north side runs the most Democratic (D+14) and the west side runs the most Republican (R+58), a spread of about 72 points.
Why 83320 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 83320, not a ranked or complete list of what matters most.
Rural areas vote Republican. Fewer than 1% of residents in 83320 live in densely developed areas, about 17 points below the Idaho average of 18%. Low college attainment predicts Republican voting, and 83320 sits in the bottom quarter (about 16%, below 78% of zip codes). A high family-household share predicts Republican voting, and about 89% of households in 83320 are family households, in the top fraction of zip codes.
Paved land cover and Republican lean
Places with little paved surface tend to lean Republican; 83320, ID sits in the bottom tenth 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 83320 looks the way it does
Areas with limited routine healthcare access turn out at lower rates. 83320 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 36% of households in 83320 rent, above 83% of zip codes. High food insecurity lines up with lower turnout, and about 23% of adults in 83320 report food insecurity, above 85% 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.