83429 leans heavily Republican by roughly 48 points: about 26% of voters vote Democratic and 74% Republican.
About more than 99% of adults in 83429 typically vote, above the U.S. average of about 62%. Among adults in 83429, ~29% vote Democratic, ~81% Republican, and ~-10% don't vote. The map below shows estimated turnout by block group.
How 83429 compares
83429 runs about 12 points more Republican than Idaho as a whole.
Why 83429 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 83429, not a ranked or complete list of what matters most.
Rural areas with a high white share vote Republican. 83429 sits in the bottom quarter on density and about 96% of residents are non-Hispanic white, about 13 points above the Idaho average of 83%.
Population density and Republican lean
Places with low population density tend to lean Republican; 83429, ID sits in the bottom tenth nationally on this measure.
Why turnout in 83429 looks the way it does
Areas with strong routine healthcare access turn out at higher rates. 83429 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 75%, about 15 points above the U.S. average of 60%. Homeowners vote more often than renters, and about 97% of households in 83429 own their home, about 22 points above the U.S. average of 75%. High high-school completion lines up with higher turnout, and about 97% of adults in 83429 have completed high school, above 88% of zip codes. 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.