77027 leans slightly Democratic by roughly 12 points: about 56% of voters vote Democratic and 44% Republican.
About 61% of adults in 77027 typically vote, near the U.S. average of about 62%. Among adults in 77027, ~34% vote Democratic, ~27% Republican, and ~39% don't vote. The map below shows estimated turnout by block group.
How 77027 compares
Among zip codes within 15 miles, 77027 leans more Democratic than 19 of 85 neighbors.
77027 runs about 26 points more Democratic than Texas as a whole. Texas leans Republican overall, while 77027 is one of the few Democratic-leaning pockets.
Politics vary noticeably by block within 77027. The east side runs the most Democratic (D+25) and the northeast side runs the most Republican (R+7), a spread of about 32 points.
Why 77027 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 77027, not a ranked or complete list of what matters most.
Dense areas vote Democratic. More than 99% of residents in 77027 live in densely developed areas, about 64 points above the U.S. average of 36%. High college attainment predicts Democratic voting, and 77027 sits in the top quarter (about 76%, in the top fraction of zip codes). A high never-married share predicts Democratic voting, and about 46% of adults in 77027 have never been married, above 92% of zip codes.
Walkability and Democratic lean
Places with a highly walkable street grid tend to lean Democratic; 77027, 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 77027 looks the way it does
Renters vote less often than owners. About 65% of households in 77027 rent, about 40 points above the U.S. average of 25%. Strong routine healthcare access lines up with higher turnout, and 77027 sits in the top 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.