83642 leans Republican by roughly 24 points: about 38% of voters vote Democratic and 62% Republican.
About 75% of adults in 83642 typically vote, above the U.S. average of about 62%. Among adults in 83642, ~29% vote Democratic, ~46% Republican, and ~25% don't vote. The map below shows estimated turnout by block group.
How 83642 compares
Among zip codes within 15 miles, 83642 leans more Republican than 10 of 19 neighbors.
83642 runs about 12 points more Democratic than Idaho as a whole.
Politics vary noticeably by block within 83642. The southwest side is the most split-leaning (R+45) and the northeast side is the least split-leaning (R+3), a spread of about 42 points.
Why 83642 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 83642, not a ranked or complete list of what matters most.
83642 votes Republican even though it is densely developed (about 87%, far above the Idaho average of 18%). State and regional patterns outweigh the Democratic lean that density usually predicts here.
Paved land cover and Democratic lean
Places with extensive paved surfaces tend to lean Democratic; 83642, ID sits in the top quarter 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 83642 looks the way it does
Areas with strong routine healthcare access turn out at higher rates. 83642 is in the top quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. The dental-visit rate here is about 72%, about 12 points above the U.S. average of 60%. 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.