83843 leans slightly Democratic by roughly 14 points: about 57% of voters vote Democratic and 43% Republican.
About 69% of adults in 83843 typically vote, above the U.S. average of about 62%. Among adults in 83843, ~39% vote Democratic, ~30% Republican, and ~31% don't vote. The map below shows estimated turnout by block group.
How 83843 compares
Among zip codes within 15 miles, 83843 leans more Democratic than 9 of 12 neighbors.
83843 runs about 51 points more Democratic than Idaho as a whole. Idaho leans Republican overall, while 83843 is one of the few Democratic-leaning pockets.
Politics vary noticeably by block within 83843. The northwest side is the most Democratic-leaning (D+25) and the southeast side is the least Democratic-leaning (Even), a spread of about 23 points.
Why 83843 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 83843, not a ranked or complete list of what matters most.
83843 votes against the grain of Idaho. Idaho leans Republican overall, while 83843 runs about 51 points more Democratic. High college attainment predicts Democratic voting, and 83843 sits in the top quarter (about 50%, above 89% of zip codes). A high never-married share predicts Democratic voting, and about 45% of adults in 83843 have never been married, above 92% of zip codes.
Population density and Democratic lean
Places with high population density tend to lean Democratic; 83843, ID sits in the top quarter nationally on this measure.
Why turnout in 83843 looks the way it does
Areas with high high-school completion turn out at higher rates. About 97% of adults in 83843 have completed high school, about 5 points above the Idaho average of 91%. 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.