83209 leans Democratic by roughly 22 points: about 61% of voters vote Democratic and 39% Republican.
About 43% of adults in 83209 typically vote, below the U.S. average of about 62%. Among adults in 83209, ~26% vote Democratic, ~17% Republican, and ~57% don't vote. The map below shows estimated turnout by block group.
How 83209 compares
Among zip codes within 15 miles, 83209 leans more Democratic than 4 of 5 neighbors.
83209 runs about 59 points more Democratic than Idaho as a whole. Idaho leans Republican overall, while 83209 is one of the few Democratic-leaning pockets.
Why 83209 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 83209, not a ranked or complete list of what matters most.
83209 votes against the grain of Idaho. Idaho leans Republican overall, while 83209 runs about 59 points more Democratic. Dense areas vote Democratic, and 83209 sits in the top fifth on density (about 80%, above 83% of zip codes). High college attainment predicts Democratic voting, and 83209 sits in the top quarter (about 44%, above 84% of zip codes).
Paved land cover and Democratic lean
Places with extensive paved surfaces tend to lean Democratic; 83209, ID sits in the top quarter 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 83209 looks the way it does
Renters vote less often than owners. About 48% of households in 83209 rent, about 23 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.