78727 leans heavily Democratic by roughly 42 points: about 71% of voters vote Democratic and 29% Republican.
About 60% of adults in 78727 typically vote, near the U.S. average of about 62%. Among adults in 78727, ~43% vote Democratic, ~17% Republican, and ~40% don't vote. The map below shows estimated turnout by block group.
How 78727 compares
Among zip codes within 15 miles, 78727 leans more Democratic than 27 of 42 neighbors.
78727 runs about 56 points more Democratic than Texas as a whole. Texas leans Republican overall, while 78727 is one of the few Democratic-leaning pockets.
Politics vary noticeably by block within 78727. The southeast side is the most Democratic-leaning (D+49) and the north side is the least Democratic-leaning (D+32), a spread of about 17 points.
Why 78727 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 78727, not a ranked or complete list of what matters most.
Areas with high college attainment vote Democratic. About 65% of adults in 78727 hold a bachelor's degree, about 37 points above the U.S. average of 28%. Dense areas vote Democratic, and 78727 sits in the top fifth on density (about 89%, above 87% of zip codes). 78727 runs against the grain of Texas, a Democratic-leaning pocket in a Republican-leaning state.
Paved land cover and Democratic lean
Places with extensive paved surfaces tend to lean Democratic; 78727, TX sits in the top tenth 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 78727 looks the way it does
Renters vote less often than owners. About 56% of households in 78727 rent, about 31 points above the U.S. average of 25%. 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.