83333 leans Democratic by roughly 30 points: about 65% of voters vote Democratic and 35% Republican.
About 83% of adults in 83333 typically vote, above the U.S. average of about 62%. Among adults in 83333, ~54% vote Democratic, ~29% Republican, and ~17% don't vote. The map below shows estimated turnout by block group.
How 83333 compares
Among zip codes within 15 miles, 83333 leans more Democratic than 3 of 4 neighbors.
83333 runs about 66 points more Democratic than Idaho as a whole. Idaho leans Republican overall, while 83333 is one of the few Democratic-leaning pockets.
Politics vary noticeably by block within 83333. The west side is the most Democratic-leaning (D+48) and the northeast side is the least Democratic-leaning (D+17), a spread of about 30 points.
Why 83333 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 83333, not a ranked or complete list of what matters most.
83333 votes against the grain of Idaho. Idaho leans Republican overall, while 83333 runs about 66 points more Democratic. High college attainment predicts Democratic voting, and 83333 sits in the top quarter (about 45%, above 86% of zip codes).
Population density and Democratic lean
Places with high population density tend to lean Democratic; 83333, ID sits above the national average on this measure.
Why turnout in 83333 looks the way it does
Areas with strong routine healthcare access turn out at higher rates. 83333 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 70%, about 10 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.