83709 leans Republican by roughly 18 points: about 41% of voters vote Democratic and 59% Republican.
About 79% of adults in 83709 typically vote, above the U.S. average of about 62%. Among adults in 83709, ~32% vote Democratic, ~46% Republican, and ~22% don't vote. The map below shows estimated turnout by block group.
How 83709 compares
Among zip codes within 15 miles, 83709 leans more Republican than 9 of 17 neighbors.
83709 runs about 19 points more Democratic than Idaho as a whole.
Politics vary noticeably by block within 83709. The southeast side is the most split-leaning (R+29) and the northeast side is the least split-leaning (Even), a spread of about 28 points.
Why 83709 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 83709, not a ranked or complete list of what matters most.
83709 votes Republican even though it is densely developed (about 93%, far above the Idaho average of 18%). State and regional patterns outweigh the Democratic lean that density usually predicts here.
Population density and Democratic lean
Places with high population density tend to lean Democratic; 83709, ID sits in the top quarter nationally on this measure.
Why turnout in 83709 looks the way it does
Areas with strong routine healthcare access turn out at higher rates. 83709 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.