78877 leans Republican by roughly 30 points: about 35% of voters vote Democratic and 65% Republican.
About 51% of adults in 78877 typically vote, below the U.S. average of about 62%. Among adults in 78877, ~18% vote Democratic, ~33% Republican, and ~49% don't vote. The map below shows estimated turnout by block group.
How 78877 compares
78877 runs about 16 points more Republican than Texas as a whole.
Politics vary noticeably by block within 78877. The northeast side is the most Republican-leaning (R+47) and the east side is the least Republican-leaning (R+15), a spread of about 32 points.
Why 78877 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 78877, not a ranked or complete list of what matters most.
Areas with low college attainment vote Republican. About 8% of adults in 78877 hold a bachelor's degree, about 17 points below the Texas average of 26%. A high family-household share predicts Republican voting, and about 88% of households in 78877 are family households, in the top fraction of zip codes.
Paved land cover and Republican lean
Places with little paved surface tend to lean Republican; 78877, 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 78877 looks the way it does
Areas with limited routine healthcare access turn out at lower rates. 78877 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%. Low high-school completion lines up with lower turnout, and about 37% of adults in 78877 have completed high school, in the bottom fraction of zip codes. High-crime urban areas turn out at lower rates, and 78877 sits in the top 15% on a violent-crime measure. 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.