83338 leans heavily Republican by roughly 46 points: about 27% of voters vote Democratic and 73% Republican.
About 64% of adults in 83338 typically vote, near the U.S. average of about 62%. Among adults in 83338, ~17% vote Democratic, ~47% Republican, and ~36% don't vote. The map below shows estimated turnout by block group.
How 83338 compares
Among zip codes within 15 miles, 83338 leans more Republican than 1 of 4 neighbors.
83338 runs about 9 points more Republican than Idaho as a whole.
Politics vary noticeably by block within 83338. The east side is the most Republican-leaning (R+68) and the west side is the least Republican-leaning (R+35), a spread of about 33 points.
Why 83338 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 83338, not a ranked or complete list of what matters most.
Areas with low college attainment vote Republican. About 13% of adults in 83338 hold a bachelor's degree, about 13 points below the Idaho average of 26%. A high family-household share predicts Republican voting, and about 78% of households in 83338 are family households, above 89% of zip codes.
Population density and Democratic lean
Places with high population density tend to lean Democratic; 83338, ID sits above the national average on this measure.
Why turnout in 83338 looks the way it does
Areas with limited routine healthcare access turn out at lower rates. 83338 is in the bottom quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. The uninsured rate here is about 21%, about 10 points above the Idaho average of 11%. 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.