83638 leans heavily Republican by roughly 36 points: about 32% of voters vote Democratic and 68% Republican.
About 74% of adults in 83638 typically vote, above the U.S. average of about 62%. Among adults in 83638, ~24% vote Democratic, ~50% Republican, and ~26% don't vote. The map below shows estimated turnout by block group.
How 83638 compares
83638 sits in a sparsely populated area with few comparable zip codes nearby.
Politically, 83638 sits close to the rest of Idaho.
Politics vary noticeably by block within 83638. The northeast side is the most Republican-leaning (R+57) and the west side is the least Republican-leaning (R+29), a spread of about 28 points.
Why 83638 leans the way it does
Density, race composition, education, and family structure all sit close to their national averages in 83638. The lean here lands roughly where demographic data alone would predict.
Frequent mental distress and voter turnout
Places with a low frequent-mental-distress rate tend to turn out at a higher rate; 83638, ID sits in the bottom tenth nationally on this measure. Reported mental distress does not drive turnout; it reflects economic and health conditions tied to voting.
Why turnout in 83638 looks the way it does
Turnout in 83638 sits close to the national pattern. Routine healthcare access, homeownership, education, and food security all land near their national averages here. 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.