78104 is a Republican stronghold. About 19% of voters here vote Democratic and 81% Republican.
About 73% of adults in 78104 typically vote, above the U.S. average of about 62%. Among adults in 78104, ~14% vote Democratic, ~59% Republican, and ~27% don't vote. The map below shows estimated turnout by block group.
How 78104 compares
Among zip codes within 15 miles, 78104 leans more Republican than 2 of 6 neighbors.
78104 runs about 48 points more Republican than Texas as a whole.
Why 78104 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 78104, not a ranked or complete list of what matters most.
Car-dependent areas vote Republican. About 90% of residents in 78104 drive to work alone, about 16 points above the U.S. average of 74%.
Population density and Republican lean
Places with low population density tend to lean Republican; 78104, TX sits below the national average on this measure.
Why turnout in 78104 looks the way it does
Homeowners vote more often than renters. About 90% of households in 78104 own their home, about 15 points above the Texas average of 75%. Limited routine healthcare access lines up with lower turnout, and 78104 sits in the bottom quarter on routine-care measures. 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.