78757 is a Democratic stronghold. About 78% of voters here vote Democratic and 22% Republican.
About 73% of adults in 78757 typically vote, above the U.S. average of about 62%. Among adults in 78757, ~57% vote Democratic, ~16% Republican, and ~27% don't vote. The map below shows estimated turnout by block group.
How 78757 compares
Among zip codes within 15 miles, 78757 leans more Democratic than 37 of 46 neighbors.
78757 runs about 69 points more Democratic than Texas as a whole. Texas leans Republican overall, while 78757 is one of the few Democratic-leaning pockets.
Politics vary noticeably by block within 78757. The east side is the most Democratic-leaning (D+62) and the south side is the least Democratic-leaning (D+50), a spread of about 12 points.
Why 78757 leans the way it does
This analysis examined 14,881 data points per zip code to find what predicts political lean and turnout. The items below are a few correlations that stood out for 78757, not a ranked or complete list of what matters most.
Dense areas vote Democratic. More than 99% of residents in 78757 live in densely developed areas, about 64 points above the U.S. average of 36%. High college attainment predicts Democratic voting, and 78757 sits in the top quarter (about 68%, above 97% of zip codes). 78757 runs against the grain of Texas, a Democratic-leaning pocket in a Republican-leaning state.
Walkability and Democratic lean
Places with a highly walkable street grid tend to lean Democratic; 78757, TX 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 78757 looks the way it does
Areas with high high-school completion turn out at higher rates. About 96% of adults in 78757 have completed high school, about 11 points above the Texas average of 86%. Learn more about the findings and methodology on the political spectrum map.
Nearby Zip Codes
Zip Codes with Similar Populations
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.