78057 is a Republican stronghold. About 24% of voters here vote Democratic and 76% Republican.
About 50% of adults in 78057 typically vote, below the U.S. average of about 62%. Among adults in 78057, ~12% vote Democratic, ~38% Republican, and ~50% don't vote. The map below shows estimated turnout by block group.
How 78057 compares
Among zip codes within 15 miles, 78057 leans more Republican than 4 of 5 neighbors.
78057 runs about 38 points more Republican than Texas as a whole.
Why 78057 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 78057, not a ranked or complete list of what matters most.
Rural areas vote Republican. About 4% of residents in 78057 live in densely developed areas, about 31 points below the Texas average of 35%. A high family-household share predicts Republican voting, and about 86% of households in 78057 are family households, above 98% of zip codes.
Paved land cover and Republican lean
Places with little paved surface tend to lean Republican; 78057, TX sits in the bottom quarter nationally on this measure. Paved ground does not change how people vote; it mostly reflects how urban and built-up a place is.
Why turnout in 78057 looks the way it does
Areas with limited routine healthcare access turn out at lower rates. 78057 is in the bottom quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. The dental-visit rate here is about 47%, about 7 points below the Texas average of 54%. Low high-school completion lines up with lower turnout, and about 79% of adults in 78057 have completed high school, below 91% of zip codes. 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.