77045 is a Democratic stronghold. About 78% of voters here vote Democratic and 22% Republican.
About 41% of adults in 77045 typically vote, below the U.S. average of about 62%. Among adults in 77045, ~32% vote Democratic, ~9% Republican, and ~59% don't vote. The map below shows estimated turnout by block group.
How 77045 compares
Among zip codes within 15 miles, 77045 leans more Democratic than 66 of 76 neighbors.
77045 runs about 69 points more Democratic than Texas as a whole. Texas leans Republican overall, while 77045 is one of the few Democratic-leaning pockets.
Politics vary noticeably by block within 77045. The north side is the most Democratic-leaning (D+62) and the southwest side is the least Democratic-leaning (D+45), a spread of about 17 points.
Why 77045 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 77045, not a ranked or complete list of what matters most.
Dense areas vote Democratic. About 96% of residents in 77045 live in densely developed areas, about 60 points above the U.S. average of 36%. A high never-married share predicts Democratic voting, and about 41% of adults in 77045 have never been married, above 89% of zip codes. 77045 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; 77045, 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 77045 looks the way it does
Areas with limited routine healthcare access turn out at lower rates. 77045 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 45%, about 9 points below the Texas average of 54%. Renters vote less often than owners, and about 35% of households in 77045 rent, above 82% of zip codes. Low high-school completion lines up with lower turnout, and about 74% of adults in 77045 have completed high school, below 96% 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.