78404 leans slightly Democratic by roughly 14 points: about 57% of voters vote Democratic and 43% Republican.
About 50% of adults in 78404 typically vote, below the U.S. average of about 62%. Among adults in 78404, ~28% vote Democratic, ~22% Republican, and ~50% don't vote. The map below shows estimated turnout by block group.
How 78404 compares
Among zip codes within 15 miles, 78404 leans more Democratic than 17 of 21 neighbors.
78404 runs about 27 points more Democratic than Texas as a whole. Texas leans Republican overall, while 78404 is one of the few Democratic-leaning pockets.
Politics vary noticeably by block within 78404. The west side is the most Democratic-leaning (D+29) and the southeast side is the least Democratic-leaning (Even), a spread of about 28 points.
Why 78404 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 78404, not a ranked or complete list of what matters most.
Dense areas vote Democratic. More than 99% of residents in 78404 live in densely developed areas, about 64 points above the U.S. average of 36%. 78404 runs against the grain of Texas, a Democratic-leaning pocket in a Republican-leaning state.
Walkability and Democratic lean
Places with a highly walkable street grid tend to lean Democratic; 78404, TX sits in the top tenth nationally on this measure. A walkable street grid does not change how people vote; it mostly reflects how urban a place is.
Why turnout in 78404 looks the way it does
Areas with limited routine healthcare access turn out at lower rates. 78404 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 47%, about 7 points below the Texas average of 54%. Renters vote less often than owners, and about 43% of households in 78404 rent, about 18 points above the U.S. average of 25%. 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.