83873 leans heavily Republican by roughly 48 points: about 26% of voters vote Democratic and 74% Republican.
About 64% of adults in 83873 typically vote, near the U.S. average of about 62%. Among adults in 83873, ~17% vote Democratic, ~47% Republican, and ~36% don't vote. The map below shows estimated turnout by block group.
How 83873 compares
Among zip codes within 15 miles, 83873 leans more Republican than 5 of 6 neighbors.
83873 runs about 12 points more Republican than Idaho as a whole.
Politics vary noticeably by block within 83873. The northeast side is the most Republican-leaning (R+59) and the south side is the least Republican-leaning (R+45), a spread of about 14 points.
Why 83873 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 83873, not a ranked or complete list of what matters most.
Areas with low college attainment vote Republican. About 16% of adults in 83873 hold a bachelor's degree, about 11 points below the Idaho average of 26%. Rural areas vote Republican, and 83873 sits in the bottom quarter on density (about 3%, below 93% of zip codes).
Developed land and Republican lean
Places with a rural land-use pattern tend to lean Republican; 83873, ID sits in the bottom tenth nationally on this measure. Developed land does not change how people vote; it mostly reflects how urban a place is.
Why turnout in 83873 looks the way it does
Turnout in 83873 sits close to the national pattern. Routine healthcare access, homeownership, education, and food security all land near their national averages here. 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.