83821 leans heavily Republican by roughly 42 points: about 29% of voters vote Democratic and 71% Republican.
About 79% of adults in 83821 typically vote, above the U.S. average of about 62%. Among adults in 83821, ~23% vote Democratic, ~56% Republican, and ~21% don't vote. The map below shows estimated turnout by block group.
How 83821 compares
83821 runs about 7 points more Republican than Idaho as a whole.
Why 83821 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 83821, not a ranked or complete list of what matters most.
Rural areas vote Republican. About 2% of residents in 83821 live in densely developed areas, about 16 points below the Idaho average of 18%.
Never-married share, developed land, and voter turnout
Places that combine a low never-married share and a rural land-use pattern tend to turn out at a higher rate, as 83821, ID does.
Why turnout in 83821 looks the way it does
Homeowners vote more often than renters. About 98% of households in 83821 own their home, about 19 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.