83706 leans Democratic by roughly 28 points: about 64% of voters vote Democratic and 36% Republican.
About 61% of adults in 83706 typically vote, near the U.S. average of about 62%. Among adults in 83706, ~39% vote Democratic, ~22% Republican, and ~39% don't vote. The map below shows estimated turnout by block group.
How 83706 compares
Among zip codes within 15 miles, 83706 leans more Democratic than 11 of 13 neighbors.
83706 runs about 64 points more Democratic than Idaho as a whole. Idaho leans Republican overall, while 83706 is one of the few Democratic-leaning pockets.
Politics vary noticeably by block within 83706. The south side is the most Democratic-leaning (D+37) and the southeast side is the least Democratic-leaning (D+24), a spread of about 13 points.
Why 83706 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 83706, not a ranked or complete list of what matters most.
Dense areas vote Democratic. About 99% of residents in 83706 live in densely developed areas, about 62 points above the U.S. average of 36%. High college attainment predicts Democratic voting, and 83706 sits in the top quarter (about 56%, above 92% of zip codes). 83706 runs against the grain of Idaho, a Democratic-leaning pocket in a Republican-leaning state.
Paved land cover and Democratic lean
Places with extensive paved surfaces tend to lean Democratic; 83706, ID sits in the top tenth nationally on this measure. Paved ground does not change how people vote; it mostly reflects how urban and built-up a place is.
Why turnout in 83706 looks the way it does
Renters vote less often than owners. About 52% of households in 83706 rent, about 27 points above the U.S. average of 25%. 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.