Twin Falls, ID Political Map | Democrat & Republican Areas in Twin Falls

By the BestNeighborhood data science team. Last updated May 2026.

Twin Falls leans heavily Republican by roughly 36 points: about 32% of voters vote Democratic and 68% Republican.

 

About 64% of adults in Twin Falls typically vote, near the U.S. average of about 62%. Among adults in Twin Falls, ~20% vote Democratic, ~44% Republican, and ~36% don't vote. The map below shows estimated turnout by block group.

How Twin Falls compares

Among cities within 25 miles, Twin Falls is the least Republican-leaning.

Politically, Twin Falls sits close to the rest of Idaho.

Politics vary noticeably by neighborhood within Twin Falls. The southwest side is the most Republican-leaning (R+51) and the north side is the least Republican-leaning (R+31), a spread of about 20 points.

Why Twin Falls leans the way it does

This analysis examined 14,881 data points per city to find what predicts political lean and turnout. The items below are a few correlations that stood out for Twin Falls, not a ranked or complete list of what matters most.

Twin Falls votes Republican even though it is densely developed (about 81%, far above the Idaho average of 18%). State and regional patterns outweigh the Democratic lean that density usually predicts here.

Walkability and Democratic lean

Places with a highly walkable street grid tend to lean Democratic; Twin Falls, 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 Twin Falls looks the way it does

Areas with limited routine healthcare access turn out at lower rates. Twin Falls is in the bottom quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. Learn more about the findings and methodology on the political spectrum map.

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.