83687 leans heavily Republican by roughly 36 points: about 32% of voters vote Democratic and 68% Republican.
About 62% of adults in 83687 typically vote, near the U.S. average of about 62%. Among adults in 83687, ~20% vote Democratic, ~42% Republican, and ~38% don't vote. The map below shows estimated turnout by block group.
How 83687 compares
Among zip codes within 15 miles, 83687 leans more Republican than 9 of 16 neighbors.
Politically, 83687 sits close to the rest of Idaho.
Politics vary noticeably by block within 83687. The north side is the most Republican-leaning (R+44) and the southwest side is the least Republican-leaning (R+12), a spread of about 33 points.
Why 83687 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 83687, not a ranked or complete list of what matters most.
83687 votes Republican even though it is densely developed (about 78%, far above the Idaho average of 18%). State and regional patterns outweigh the Democratic lean that density usually predicts here.
High-school completion, developed land, and voter turnout
Places that combine low high-school-completion share and a heavily developed built environment tend to turn out at a lower rate, as 83687, ID does.
Why turnout in 83687 looks the way it does
Areas with limited routine healthcare access turn out at lower rates. 83687 is in the bottom quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. Crowded housing lines up with lower turnout, and about 4% of homes in 83687 have more than one occupant per room, above 81% 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.