77545 is a Democratic stronghold. About 78% of voters here vote Democratic and 22% Republican.
About 58% of adults in 77545 typically vote, near the U.S. average of about 62%. Among adults in 77545, ~45% vote Democratic, ~13% Republican, and ~42% don't vote. The map below shows estimated turnout by block group.
How 77545 compares
Among zip codes within 15 miles, 77545 leans more Democratic than 35 of 42 neighbors.
77545 runs about 70 points more Democratic than Texas as a whole. Texas leans Republican overall, while 77545 is one of the few Democratic-leaning pockets.
Politics vary noticeably by block within 77545. The west side is the most Democratic-leaning (D+73) and the north side is the least Democratic-leaning (D+2), a spread of about 71 points.
Why 77545 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 77545, not a ranked or complete list of what matters most.
Density combined with diversity predicts Democratic voting. Non-Hispanic white share in 77545 is about 7%, about 65 points below the U.S. average of 72%. A high never-married share predicts Democratic voting, and about 41% of adults in 77545 have never been married, above 88% of zip codes. 77545 runs against the grain of Texas, a Democratic-leaning pocket in a Republican-leaning state.
Population density and Democratic lean
Places with high population density tend to lean Democratic; 77545, TX sits in the top quarter nationally on this measure.
Why turnout in 77545 looks the way it does
Areas with limited routine healthcare access turn out at lower rates. 77545 is in the bottom quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. 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.