78112 leans Republican by roughly 16 points: about 42% of voters vote Democratic and 58% Republican.
About 44% of adults in 78112 typically vote, below the U.S. average of about 62%. Among adults in 78112, ~18% vote Democratic, ~26% Republican, and ~56% don't vote. The map below shows estimated turnout by block group.
How 78112 compares
Among zip codes within 15 miles, 78112 leans more Republican than 12 of 16 neighbors.
Politically, 78112 sits close to the rest of Texas.
Politics vary noticeably by block within 78112. The southeast side is the most Republican-leaning (R+34) and the southwest side is the least Republican-leaning (R+14), a spread of about 20 points.
Why 78112 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 78112, not a ranked or complete list of what matters most.
Areas with low college attainment vote Republican. About 10% of adults in 78112 hold a bachelor's degree, about 16 points below the Texas average of 26%.
Preventive-care access and voter turnout
Places with limited routine preventive-care access tend to turn out at a lower rate; 78112, TX sits in the bottom quarter nationally on this measure. Dental visits do not drive turnout; the rate reflects income, insurance, and healthcare access, which line up with who votes.
Why turnout in 78112 looks the way it does
Areas with limited routine healthcare access turn out at lower rates. 78112 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 28%, about 9 points above the Texas average of 19%. Low high-school completion lines up with lower turnout, and about 80% of adults in 78112 have completed high school, below 91% 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.