77905 is a Republican stronghold. About 19% of voters here vote Democratic and 81% Republican.
About 63% of adults in 77905 typically vote, near the U.S. average of about 62%. Among adults in 77905, ~12% vote Democratic, ~51% Republican, and ~37% don't vote. The map below shows estimated turnout by block group.
How 77905 compares
Among zip codes within 15 miles, 77905 leans more Republican than 4 of 6 neighbors.
77905 runs about 48 points more Republican than Texas as a whole.
Politics vary noticeably by block within 77905. The southwest side is the most Republican-leaning (R+69) and the southeast side is the least Republican-leaning (R+49), a spread of about 21 points.
Why 77905 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 77905, not a ranked or complete list of what matters most.
Areas with many family households vote Republican. About 80% of households in 77905 are family households, about 13 points above the U.S. average of 67%.
Park access and Republican lean
Places with low park coverage tend to lean Republican; 77905, TX sits in the bottom quarter nationally on this measure. Park access does not change how people vote; it tends to track denser, higher-income areas.
Why turnout in 77905 looks the way it does
Areas with limited routine healthcare access turn out at lower rates. 77905 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.