83712 leans heavily Democratic by roughly 30 points: about 65% of voters vote Democratic and 35% Republican.
About 72% of adults in 83712 typically vote, above the U.S. average of about 62%. Among adults in 83712, ~47% vote Democratic, ~25% Republican, and ~28% don't vote. The map below shows estimated turnout by block group.
How 83712 compares
Among zip codes within 15 miles, 83712 leans more Democratic than 12 of 13 neighbors.
83712 runs about 67 points more Democratic than Idaho as a whole. Idaho leans Republican overall, while 83712 is one of the few Democratic-leaning pockets.
Politics vary noticeably by block within 83712. The northwest side is the most Democratic-leaning (D+46) and the east side is the least Democratic-leaning (D+5), a spread of about 42 points.
Why 83712 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 83712, not a ranked or complete list of what matters most.
Areas with high college attainment vote Democratic. About 63% of adults in 83712 hold a bachelor's degree, about 35 points above the U.S. average of 28%. 83712 runs against the grain of Idaho, a Democratic-leaning pocket in a Republican-leaning state.
Population density and Democratic lean
Places with high population density tend to lean Democratic; 83712, ID sits in the top quarter nationally on this measure.
Why turnout in 83712 looks the way it does
Areas with strong routine healthcare access turn out at higher rates. 83712 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 77%, about 17 points above the U.S. average of 60%. High high-school completion lines up with higher turnout, and about 97% of adults in 83712 have completed high school, above 86% 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.