75503 leans heavily Republican by roughly 34 points: about 33% of voters vote Democratic and 67% Republican.
About 72% of adults in 75503 typically vote, above the U.S. average of about 62%. Among adults in 75503, ~24% vote Democratic, ~48% Republican, and ~28% don't vote. The map below shows estimated turnout by block group.
How 75503 compares
Among zip codes within 15 miles, 75503 leans more Republican than 3 of 7 neighbors.
75503 runs about 20 points more Republican than Texas as a whole.
Politics vary noticeably by block within 75503. The south side runs the most Democratic (D+10) and the northwest side runs the most Republican (R+58), a spread of about 68 points.
Why 75503 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 75503, not a ranked or complete list of what matters most.
Car-dependent areas vote Republican. About 83% of residents in 75503 drive to work alone, about 10 points above the U.S. average of 74%.
Walkability and Democratic lean
Places with a highly walkable street grid tend to lean Democratic; 75503, TX sits in the top quarter nationally on this measure. A walkable street grid does not change how people vote; it mostly reflects how urban a place is.
Why turnout in 75503 looks the way it does
Areas with high high-school completion turn out at higher rates. About 96% of adults in 75503 have completed high school, about 10 points above the Texas average of 86%. 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.