78259 leans slightly Republican by roughly 6 points: about 47% of voters vote Democratic and 53% Republican.
About 67% of adults in 78259 typically vote, near the U.S. average of about 62%. Among adults in 78259, ~31% vote Democratic, ~36% Republican, and ~33% don't vote. The map below shows estimated turnout by block group.
How 78259 compares
Among zip codes within 15 miles, 78259 leans more Republican than 31 of 40 neighbors.
78259 runs about 7 points more Democratic than Texas as a whole.
Politics vary noticeably by block within 78259. The south side is the most split-leaning (R+11) and the northwest side is the least split-leaning (Even), a spread of about 10 points.
Why 78259 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 78259, not a ranked or complete list of what matters most.
78259 votes Republican even though it is densely developed (about 67%, far above the Texas average of 35%). State and regional patterns outweigh the Democratic lean that density usually predicts here.
Non-English at home and voter turnout
Places with a low non-English-at-home share tend to turn out at a higher rate; 78259, TX sits in the bottom quarter nationally on this measure.
Why turnout in 78259 looks the way it does
Areas with strong routine healthcare access turn out at higher rates. 78259 is in the top quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. The dental-visit rate here is about 69%, about 9 points above the U.S. average of 60%. High high-school completion lines up with higher turnout, and about 96% of adults in 78259 have completed high school, above 81% of 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.