77504 leans slightly Republican by roughly 8 points: about 46% of voters vote Democratic and 54% Republican.
About 40% of adults in 77504 typically vote, below the U.S. average of about 62%. Among adults in 77504, ~18% vote Democratic, ~22% Republican, and ~60% don't vote. The map below shows estimated turnout by block group.
How 77504 compares
Among zip codes within 15 miles, 77504 leans more Republican than 44 of 56 neighbors.
77504 runs about 6 points more Democratic than Texas as a whole.
Politics vary noticeably by block within 77504. The northwest side runs the most Democratic (D+8) and the south side runs the most Republican (R+19), a spread of about 28 points.
Why 77504 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 77504, not a ranked or complete list of what matters most.
77504 votes Republican even though it is densely developed (about 98%, far above the Texas average of 35%). State and regional patterns outweigh the Democratic lean that density usually predicts here. Low college attainment predicts Republican voting, and 77504 sits in the bottom quarter (about 15%, below 81% of zip codes).
High-school completion, developed land, and voter turnout
Places that combine low high-school-completion share and a heavily developed built environment tend to turn out at a lower rate, as 77504, TX does.
Why turnout in 77504 looks the way it does
Areas with limited routine healthcare access turn out at lower rates. 77504 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 48%, about 5 points below the Texas average of 54%. Renters vote less often than owners, and about 54% of households in 77504 rent, compared to around 39% in nearby zip codes. Low high-school completion lines up with lower turnout, and about 80% of adults in 77504 have completed high school, below 91% 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.