78227 leans Democratic by roughly 22 points: about 61% of voters vote Democratic and 39% Republican.
About 38% of adults in 78227 typically vote, below the U.S. average of about 62%. Among adults in 78227, ~23% vote Democratic, ~15% Republican, and ~62% don't vote. The map below shows estimated turnout by block group.
How 78227 compares
Among zip codes within 15 miles, 78227 leans more Democratic than 27 of 48 neighbors.
78227 runs about 35 points more Democratic than Texas as a whole. Texas leans Republican overall, while 78227 is one of the few Democratic-leaning pockets.
Politics vary noticeably by block within 78227. The east side is the most Democratic-leaning (D+28) and the southwest side is the least Democratic-leaning (D+15), a spread of about 13 points.
Why 78227 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 78227, not a ranked or complete list of what matters most.
Dense areas vote Democratic. About 91% of residents in 78227 live in densely developed areas, about 55 points above the U.S. average of 36%. A high never-married share predicts Democratic voting, and about 41% of adults in 78227 have never been married, above 89% of zip codes. 78227 runs against the grain of Texas, a Democratic-leaning pocket in a Republican-leaning state.
Preventive-care access and voter turnout
Places with limited routine preventive-care access tend to turn out at a lower rate; 78227, TX sits in the bottom tenth 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 78227 looks the way it does
Areas with limited routine healthcare access turn out at lower rates. 78227 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 41% of households in 78227 rent, about 16 points above the U.S. average of 25%. Low high-school completion lines up with lower turnout, and about 78% of adults in 78227 have completed high school, below 93% 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.