77070 is a true toss-up. About 50% of voters here vote Democratic and 50% Republican.
About 55% of adults in 77070 typically vote, below the U.S. average of about 62%. Among adults in 77070, ~27% vote Democratic, ~28% Republican, and ~45% don't vote. The map below shows estimated turnout by block group.
How 77070 compares
Among zip codes within 15 miles, 77070 sits roughly in the middle of the political spectrum, with 15 neighbors leaning further in the place's direction and 26 leaning the other way.
77070 runs about 14 points more Democratic than Texas as a whole. Texas leans Republican overall, while 77070 sits closer to the political middle.
Politics vary noticeably by block within 77070. The southeast side runs the most Democratic (D+22) and the northwest side runs the most Republican (R+29), a spread of about 51 points.
Why 77070 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 77070, not a ranked or complete list of what matters most.
77070 votes against the grain of Texas. Texas leans Republican overall, while 77070 runs about 14 points more Democratic.
Walkability and Democratic lean
Places with a highly walkable street grid tend to lean Democratic; 77070, TX sits in the top quarter 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 77070 looks the way it does
Areas with limited routine healthcare access turn out at lower rates. 77070 is in the bottom quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. Renters vote less often than owners, and about 47% of households in 77070 rent, about 22 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.