78725 leans heavily Democratic by roughly 40 points: about 70% of voters vote Democratic and 30% Republican.
About 48% of adults in 78725 typically vote, below the U.S. average of about 62%. Among adults in 78725, ~33% vote Democratic, ~14% Republican, and ~53% don't vote. The map below shows estimated turnout by block group.
How 78725 compares
Among zip codes within 15 miles, 78725 leans more Democratic than 13 of 33 neighbors.
78725 runs about 54 points more Democratic than Texas as a whole. Texas leans Republican overall, while 78725 is one of the few Democratic-leaning pockets.
Politics vary noticeably by block within 78725. The northwest side is the most Democratic-leaning (D+55) and the west side is the least Democratic-leaning (D+38), a spread of about 17 points.
Why 78725 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 78725, not a ranked or complete list of what matters most.
78725 votes against the grain of Texas. Texas leans Republican overall, while 78725 runs about 54 points more Democratic. A high never-married share predicts Democratic voting, and about 39% of adults in 78725 have never been married, above 85% of zip codes.
Population density and Democratic lean
Places with high population density tend to lean Democratic; 78725, TX sits above the national average on this measure.
Why turnout in 78725 looks the way it does
Areas with limited routine healthcare access turn out at lower rates. 78725 is in the bottom quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. The uninsured rate here is about 21%, about 10 points above the U.S. average of 10%. 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.