83646 leans Republican by roughly 26 points: about 37% of voters vote Democratic and 63% Republican.
About 81% of adults in 83646 typically vote, above the U.S. average of about 62%. Among adults in 83646, ~30% vote Democratic, ~51% Republican, and ~19% don't vote. The map below shows estimated turnout by block group.
How 83646 compares
Among zip codes within 15 miles, 83646 leans more Republican than 10 of 19 neighbors.
83646 runs about 10 points more Democratic than Idaho as a whole.
Politics vary noticeably by block within 83646. The northwest side is the most Republican-leaning (R+41) and the southeast side is the least Republican-leaning (R+14), a spread of about 27 points.
Why 83646 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 83646, not a ranked or complete list of what matters most.
83646 votes Republican even though it is densely developed (about 91%, far above the Idaho average of 18%). State and regional patterns outweigh the Democratic lean that density usually predicts here. A high family-household share predicts Republican voting, and about 79% of households in 83646 are family households, above 89% of zip codes.
Preventive-care access and voter turnout
Places with strong routine preventive-care access tend to turn out at a higher rate; 83646, ID sits in the top tenth nationally on this measure. Dental visits do not drive turnout; the rate reflects income, insurance, and healthcare access, which line up with who votes.
Why turnout in 83646 looks the way it does
Areas with strong routine healthcare access turn out at higher rates. 83646 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 73%, about 13 points above the U.S. average of 60%. High high-school completion lines up with higher turnout, and about 96% of adults in 83646 have completed high school, above 84% 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.