78028 leans heavily Republican by roughly 42 points: about 29% of voters vote Democratic and 71% Republican.
About 72% of adults in 78028 typically vote, above the U.S. average of about 62%. Among adults in 78028, ~21% vote Democratic, ~51% Republican, and ~28% don't vote. The map below shows estimated turnout by block group.
How 78028 compares
78028 sits in a sparsely populated area with few comparable zip codes nearby.
78028 runs about 27 points more Republican than Texas as a whole.
Politics vary noticeably by block within 78028. The southwest side is the most Republican-leaning (R+56) and the east side is the least Republican-leaning (R+25), a spread of about 30 points.
Why 78028 leans the way it does
Density, race composition, education, and family structure all sit close to their national averages in 78028. The lean here lands roughly where demographic data alone would predict.
Walkability and Democratic lean
Places with a highly walkable street grid tend to lean Democratic; 78028, TX sits above the national average on this measure. A walkable street grid does not change how people vote; it mostly reflects how urban a place is.
Why turnout in 78028 looks the way it does
Areas with limited routine healthcare access turn out at lower rates. 78028 is in the bottom quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. 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.