77613 is a Republican stronghold. About 23% of voters here vote Democratic and 77% Republican.
About 75% of adults in 77613 typically vote, above the U.S. average of about 62%. Among adults in 77613, ~17% vote Democratic, ~58% Republican, and ~25% don't vote. The map below shows estimated turnout by block group.
How 77613 compares
Among zip codes within 15 miles, 77613 leans more Republican than 8 of 12 neighbors.
77613 runs about 40 points more Republican than Texas as a whole.
Politics vary noticeably by block within 77613. The west side is the most Republican-leaning (R+75) and the south side is the least Republican-leaning (R+20), a spread of about 55 points.
Why 77613 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 77613, not a ranked or complete list of what matters most.
Car-dependent areas vote Republican. About 94% of residents in 77613 drive to work alone, about 20 points above the U.S. average of 74%.
Population density and Republican lean
Places with low population density tend to lean Republican; 77613, TX sits below the national average on this measure.
Why turnout in 77613 looks the way it does
Turnout in 77613 sits close to the national pattern. Routine healthcare access, homeownership, education, and food security all land near their national averages here. 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.