Spring Branch is a Republican stronghold. About 25% of voters here vote Democratic and 75% Republican.
About 84% of adults in Spring Branch typically vote, above the U.S. average of about 62%. Among adults in Spring Branch, ~21% vote Democratic, ~63% Republican, and ~16% don't vote. The map below shows estimated turnout by block group.
How Spring Branch compares
Among cities within 25 miles, Spring Branch leans more Republican than 21 of 31 neighbors.
Spring Branch runs about 37 points more Republican than Texas as a whole.
Why Spring Branch 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 Spring Branch, not a ranked or complete list of what matters most.
Areas with many family households vote Republican. About 81% of households in Spring Branch are family households, about 14 points above the U.S. average of 67%. Dense places usually vote Democratic, but Spring Branch runs against that pattern.
Population density and Democratic lean
Places with high population density tend to lean Democratic; Spring Branch, TX sits in the top quarter nationally on this measure.
Why turnout in Spring Branch looks the way it does
Areas with limited routine healthcare access turn out at lower rates. Spring Branch 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
- Bulverde, TX R+50
- Wetmore, TX R+51
- Canyon Lake, TX R+48
- Kendalia, TX R+59
- Fischer, TX R+55
- Bergheim, TX R+56
- Sattler, TX R+58
- Timberwood Park, TX R+15
- Blanco, TX R+53
- Startzville, TX R+41
Cities with Similar Populations
- Kenmore, NY D+33
- Short Hills, NJ D+35
- Pacific Grove, CA D+55
- Norridge, IL R+21
- Richlands, NC R+46
- Berkley, MI D+31
- Ellwood City, PA R+34
- Warrington, FL R+14
- Wallkill, NY R+20
- Madison Heights, VA R+27
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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.