Blaine County leans Democratic by roughly 22 points: about 61% of voters vote Democratic and 39% Republican.
About 80% of adults in Blaine County typically vote, above the U.S. average of about 62%. Among adults in Blaine County, ~49% vote Democratic, ~31% Republican, and ~20% don't vote. The map below shows estimated turnout by block group.
How Blaine County compares
Blaine County sits in a sparsely populated area with few comparable counties nearby.
Blaine County runs about 58 points more Democratic than Idaho as a whole. Idaho leans Republican overall, while Blaine County is one of the few Democratic-leaning pockets.
Politics vary noticeably by city within Blaine County. The west side runs the most Democratic (D+28) and the southeast side runs the most Republican (R+32), a spread of about 60 points.
Why Blaine County leans the way it does
This analysis examined 14,881 data points per county to find what predicts political lean and turnout. The items below are a few correlations that stood out for Blaine County, not a ranked or complete list of what matters most.
Areas with high college attainment vote Democratic. About 47% of adults in Blaine County hold a bachelor's degree, about 19 points above the U.S. average of 28%. Blaine County runs against the grain of Idaho, a Democratic-leaning pocket in a Republican-leaning state.
Walkability and Democratic lean
Places with a highly walkable street grid tend to lean Democratic; Blaine County, ID sits in the top tenth nationally on this measure. A walkable street grid does not change how people vote; it mostly reflects how urban a place is.
Why turnout in Blaine County looks the way it does
Areas with strong routine healthcare access turn out at higher rates. Blaine County 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 71%, about 11 points above the U.S. average of 60%. Learn more about the findings and methodology on the political spectrum map.
Nearby Counties
- Camas County, ID R+72
- Lincoln County, ID R+63
- Butte County, ID R+75
- Custer County, ID R+52
- Gooding County, ID R+54
- Jerome County, ID R+48
- Twin Falls County, ID R+45
- Minidoka County, ID R+58
- Elmore County, ID R+42
- Cassia County, ID R+63
Counties with Similar Populations
- Lincoln County, KY R+64
- Abbeville County, SC R+39
- Jerome County, ID R+48
- George County, MS R+78
- Scott County, IN R+53
- Fairfax City, VA D+25
- Dawson County, NE R+35
- Fayette County, TX R+55
- Marion County, MS R+33
- Bell County, KY R+62
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.