South Mountain is a Republican stronghold. About 13% of voters here vote Democratic and 87% Republican.
About 64% of adults in South Mountain typically vote, near the U.S. average of about 62%. Among adults in South Mountain, ~8% vote Democratic, ~56% Republican, and ~36% don't vote. The map below shows estimated turnout by block group.
How South Mountain compares
Among cities within 25 miles, South Mountain leans more Republican than 16 of 31 neighbors.
South Mountain runs about 60 points more Republican than Texas as a whole.
Politics vary noticeably by neighborhood within South Mountain. The southeast side is the most Republican-leaning (R+76) and the west side is the least Republican-leaning (R+62), a spread of about 14 points.
Why South Mountain 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 South Mountain, not a ranked or complete list of what matters most.
Car-dependent areas vote Republican. About 92% of residents in South Mountain drive to work alone, about 18 points above the U.S. average of 74%.
Never-married share and voter turnout
Places with a low never-married share tend to turn out at a higher rate; South Mountain, TX sits in the bottom quarter nationally on this measure.
Why turnout in South Mountain looks the way it does
Areas with limited routine healthcare access turn out at lower rates. South Mountain 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.
Nearby Cities
- Gatesville, TX R+43
- Mound, TX R+74
- Ireland, TX R+62
- Leon Junction, TX R+74
- Oglesby, TX R+72
- Flat, TX R+74
- Osage, TX R+75
- Turnersville, TX R+80
- Mosheim, TX R+74
- Arnett, TX R+75
Cities with Similar Populations
- Rudyard, MI R+39
- Matherville, IL R+30
- Hoyleton, IL R+62
- Ellison Bay, WI D+14
- Irvington, WI R+28
- Stittsville, MI R+51
- Kelso, MO R+69
- Uno, VA R+38
- Lakeland, LA R+44
- Hartland, NY R+47
Sources and methodology
Precinct-level voting records used to fit the model come from Texas Secretary of State, Elections Division, 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.