78122 is a Republican stronghold. About 15% of voters here vote Democratic and 85% Republican.
About 54% of adults in 78122 typically vote, below the U.S. average of about 62%. Among adults in 78122, ~8% vote Democratic, ~46% Republican, and ~46% don't vote. The map below shows estimated turnout by block group.
How 78122 compares
Among zip codes within 15 miles, 78122 leans more Republican than 3 of 5 neighbors.
78122 runs about 57 points more Republican than Texas as a whole.
Why 78122 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 78122, not a ranked or complete list of what matters most.
Rural areas vote Republican. About 4% of residents in 78122 live in densely developed areas, about 31 points below the Texas average of 35%. Low college attainment predicts Republican voting, and 78122 sits in the bottom quarter (about 8%, below 97% of zip codes).
Paved land cover and Republican lean
Places with little paved surface tend to lean Republican; 78122, 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 78122 looks the way it does
Areas with limited routine healthcare access turn out at lower rates. 78122 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 48%, about 5 points below the Texas average of 54%. 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.