Southwest Corridor, Billings, MT Political Map | Democrat & Republican Areas in Southwest Corridor

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

Southwest Corridor leans Republican by roughly 20 points: about 40% of voters vote Democratic and 60% Republican.

 

About 62% of adults in Southwest Corridor typically vote, near the U.S. average of about 62%. Among adults in Southwest Corridor, ~25% vote Democratic, ~37% Republican, and ~38% don't vote. The map below shows estimated turnout by block group.

How Southwest Corridor compares

Among neighborhoods within 5 miles, Southwest Corridor leans more Republican than 5 of 7 neighbors.

Politically, Southwest Corridor sits close to the rest of Montana.

Politics vary noticeably by block within Southwest Corridor. The southwest side is the most Republican-leaning (R+33) and the northeast side is the least Republican-leaning (R+9), a spread of about 24 points.

Why Southwest Corridor leans the way it does

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

Areas with low college attainment vote Republican. About 16% of adults in Southwest Corridor hold a bachelor's degree, about 13 points below the Montana average of 29%.

Cancer-screening access and voter turnout

Places with low colon-cancer-screening access tend to turn out at a lower rate; Southwest Corridor, Billings, MT sits below the national average on this measure. Cancer screening does not drive turnout; it reflects income, insurance, and healthcare access.

Why turnout in Southwest Corridor looks the way it does

High-crime urban areas turn out at lower rates, mostly because the housing stress common in those areas makes voting harder. Southwest Corridor sits in the top 15% nationally on a violent-crime measure. See CrimeGrade for more details. 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 Montana 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.