83686 leans heavily Republican by roughly 40 points: about 30% of voters vote Democratic and 70% Republican.
About 70% of adults in 83686 typically vote, above the U.S. average of about 62%. Among adults in 83686, ~21% vote Democratic, ~49% Republican, and ~30% don't vote. The map below shows estimated turnout by block group.
How 83686 compares
Among zip codes within 15 miles, 83686 leans more Republican than 8 of 14 neighbors.
83686 runs about 4 points more Republican than Idaho as a whole.
Politics vary noticeably by block within 83686. The southwest side is the most Republican-leaning (R+58) and the north side is the least Republican-leaning (R+22), a spread of about 36 points.
Why 83686 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 83686, not a ranked or complete list of what matters most.
83686 votes Republican even though it is densely developed (about 82%, 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 77% of households in 83686 are family households, above 86% of zip codes.
Population density and Democratic lean
Places with high population density tend to lean Democratic; 83686, ID sits in the top quarter nationally on this measure.
Why turnout in 83686 looks the way it does
Turnout in 83686 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.