78124 leans heavily Republican by roughly 42 points: about 29% of voters vote Democratic and 71% Republican.
About 70% of adults in 78124 typically vote, above the U.S. average of about 62%. Among adults in 78124, ~20% vote Democratic, ~50% Republican, and ~30% don't vote. The map below shows estimated turnout by block group.
How 78124 compares
Among zip codes within 15 miles, 78124 leans more Republican than 13 of 14 neighbors.
78124 runs about 27 points more Republican than Texas as a whole.
Politics vary noticeably by block within 78124. The south side is the most Republican-leaning (R+58) and the west side is the least Republican-leaning (R+30), a spread of about 28 points.
Why 78124 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 78124, not a ranked or complete list of what matters most.
Areas with many family households vote Republican. About 78% of households in 78124 are family households, about 12 points above the U.S. average of 67%.
Homeownership and voter turnout
Places with homeowner-heavy households tend to turn out at a higher rate; 78124, TX sits in the top quarter nationally on this measure.
Why turnout in 78124 looks the way it does
Homeowners vote more often than renters. About 88% of households in 78124 own their home, about 13 points above the Texas average of 75%. Limited routine healthcare access lines up with lower turnout, and 78124 sits in the bottom quarter on routine-care measures. 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.