77581 leans Republican by roughly 20 points: about 40% of voters vote Democratic and 60% Republican.
About 69% of adults in 77581 typically vote, above the U.S. average of about 62%. Among adults in 77581, ~28% vote Democratic, ~41% Republican, and ~31% don't vote. The map below shows estimated turnout by block group.
How 77581 compares
Among zip codes within 15 miles, 77581 leans more Republican than 44 of 54 neighbors.
77581 runs about 7 points more Republican than Texas as a whole.
Politics vary noticeably by block within 77581. The southeast side is the most Republican-leaning (R+34) and the west side is the least Republican-leaning (R+12), a spread of about 22 points.
Why 77581 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 77581, not a ranked or complete list of what matters most.
77581 votes Republican even though it is densely developed (about 91%, far above the Texas average of 35%). State and regional patterns outweigh the Democratic lean that density usually predicts here. A high family-household share predicts Republican voting, and about 79% of households in 77581 are family households, above 90% of zip codes.
Population density and Democratic lean
Places with high population density tend to lean Democratic; 77581, TX sits in the top quarter nationally on this measure.
Why turnout in 77581 looks the way it does
Areas with limited routine healthcare access turn out at lower rates. 77581 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.