83702 leans heavily Democratic by roughly 42 points: about 71% of voters vote Democratic and 29% Republican.
About 71% of adults in 83702 typically vote, above the U.S. average of about 62%. Among adults in 83702, ~51% vote Democratic, ~21% Republican, and ~28% don't vote. The map below shows estimated turnout by block group.
How 83702 compares
Among zip codes within 15 miles, 83702 is the most Democratic-leaning.
83702 runs about 79 points more Democratic than Idaho as a whole. Idaho leans Republican overall, while 83702 is one of the few Democratic-leaning pockets.
Politics vary noticeably by block within 83702. The east side is the most Democratic-leaning (D+59) and the northeast side is the least Democratic-leaning (D+28), a spread of about 31 points.
Why 83702 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 83702, not a ranked or complete list of what matters most.
Areas with high college attainment vote Democratic. About 63% of adults in 83702 hold a bachelor's degree, about 34 points above the U.S. average of 28%. Dense areas vote Democratic, and 83702 sits in the top fifth on density (about 81%, above 84% of zip codes). 83702 runs against the grain of Idaho, a Democratic-leaning pocket in a Republican-leaning state.
Walkability and Democratic lean
Places with a highly walkable street grid tend to lean Democratic; 83702, ID sits in the top tenth nationally on this measure. A walkable street grid does not change how people vote; it mostly reflects how urban a place is.
Why turnout in 83702 looks the way it does
Areas with strong routine healthcare access turn out at higher rates. 83702 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 97% of adults in 83702 have completed high school, above 89% 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.