83311 is a Republican stronghold. About 9% of voters here vote Democratic and 91% Republican.
About 60% of adults in 83311 typically vote, near the U.S. average of about 62%. Among adults in 83311, ~6% vote Democratic, ~54% Republican, and ~40% don't vote. The map below shows estimated turnout by block group.
How 83311 compares
Among zip codes within 15 miles, 83311 leans more Republican than 2 of 3 neighbors.
83311 runs about 45 points more Republican than Idaho as a whole.
Why 83311 leans the way it does
Density, race composition, education, and family structure all sit close to their national averages in 83311. The lean here lands roughly where demographic data alone would predict.
Population density and Republican lean
Places with low population density tend to lean Republican; 83311, ID sits in the bottom tenth nationally on this measure.
Why turnout in 83311 looks the way it does
Areas with limited routine healthcare access turn out at lower rates. 83311 is in the bottom quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. Crowded housing lines up with lower turnout, and about 13% of homes in 83311 have more than one occupant per room, above 98% 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.