78628 leans Republican by roughly 18 points: about 41% of voters vote Democratic and 59% Republican.
About 79% of adults in 78628 typically vote, above the U.S. average of about 62%. Among adults in 78628, ~32% vote Democratic, ~47% Republican, and ~21% don't vote. The map below shows estimated turnout by block group.
How 78628 compares
Among zip codes within 15 miles, 78628 leans more Republican than 10 of 14 neighbors.
78628 runs about 4 points more Republican than Texas as a whole.
Politics vary noticeably by block within 78628. The west side is the most Republican-leaning (R+24) and the east side is the least Republican-leaning (R+9), a spread of about 15 points.
Why 78628 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 78628, not a ranked or complete list of what matters most.
Areas with many family households vote Republican. About 77% of households in 78628 are family households, about 11 points above the U.S. average of 67%.
Cancer-screening access and voter turnout
Places with high colon-cancer-screening access tend to turn out at a higher rate; 78628, TX sits above the national average on this measure. Cancer screening does not drive turnout; it reflects income, insurance, and healthcare access.
Why turnout in 78628 looks the way it does
Turnout in 78628 sits close to the national pattern. Routine healthcare access, homeownership, education, and food security all land near their national averages here. 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.