78151 leans Republican by roughly 24 points: about 38% of voters vote Democratic and 62% Republican.
About 60% of adults in 78151 typically vote, near the U.S. average of about 62%. Among adults in 78151, ~23% vote Democratic, ~37% Republican, and ~40% don't vote. The map below shows estimated turnout by block group.
How 78151 compares
Among zip codes within 15 miles, 78151 is the least Republican-leaning.
78151 runs about 10 points more Republican than Texas as a whole.
Why 78151 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 78151, not a ranked or complete list of what matters most.
Car-dependent areas vote Republican. About 94% of residents in 78151 drive to work alone, about 20 points above the U.S. average of 74%. A high family-household share predicts Republican voting, and about 75% of households in 78151 are family households, above 79% of zip codes.
Population density, never-married share, and Republican lean
Places that combine low population density and a never-married-heavy adult population tend to lean Republican, as 78151, TX does.
Why turnout in 78151 looks the way it does
Areas with limited routine healthcare access turn out at lower rates. 78151 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 46%, about 8 points below the Texas average of 54%. Renters vote less often than owners, and about 46% of households in 78151 rent, compared to around 19% in nearby 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.