78664 leans Democratic by roughly 18 points: about 59% of voters vote Democratic and 41% Republican.
About 57% of adults in 78664 typically vote, near the U.S. average of about 62%. Among adults in 78664, ~34% vote Democratic, ~23% Republican, and ~43% don't vote. The map below shows estimated turnout by block group.
How 78664 compares
Among zip codes within 15 miles, 78664 leans more Democratic than 11 of 29 neighbors.
78664 runs about 32 points more Democratic than Texas as a whole. Texas leans Republican overall, while 78664 is one of the few Democratic-leaning pockets.
Politics vary noticeably by block within 78664. The south side runs the most Democratic (D+25) and the northeast side runs the most Republican (R+11), a spread of about 36 points.
Why 78664 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 78664, not a ranked or complete list of what matters most.
Dense areas vote Democratic. About 91% of residents in 78664 live in densely developed areas, about 55 points above the U.S. average of 36%. High college attainment predicts Democratic voting, and 78664 sits in the top quarter (about 37%, above 77% of zip codes). 78664 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; 78664, 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 78664 looks the way it does
Areas with limited routine healthcare access turn out at lower rates. 78664 is in the bottom quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. Renters vote less often than owners, and about 42% of households in 78664 rent, about 17 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.