79403 leans slightly Democratic by roughly 6 points: about 53% of voters vote Democratic and 47% Republican.
About 47% of adults in 79403 typically vote, below the U.S. average of about 62%. Among adults in 79403, ~25% vote Democratic, ~22% Republican, and ~53% don't vote. The map below shows estimated turnout by block group.
How 79403 compares
Among zip codes within 15 miles, 79403 leans more Democratic than 15 of 20 neighbors.
79403 runs about 20 points more Democratic than Texas as a whole. Texas leans Republican overall, while 79403 is one of the few Democratic-leaning pockets.
Politics vary noticeably by block within 79403. The southwest side runs the most Democratic (D+61) and the northeast side runs the most Republican (R+63), a spread of about 124 points.
Why 79403 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 79403, not a ranked or complete list of what matters most.
79403 votes against the grain of Texas. Texas leans Republican overall, while 79403 runs about 20 points more Democratic. A high never-married share predicts Democratic voting, and about 34% of adults in 79403 have never been married, above 77% 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 79403, TX does.
Why turnout in 79403 looks the way it does
Areas with limited routine healthcare access turn out at lower rates. 79403 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 43%, about 10 points below the Texas average of 54%. Renters vote less often than owners, and about 40% of households in 79403 rent, compared to around 58% in nearby zip codes. Low high-school completion lines up with lower turnout, and about 78% of adults in 79403 have completed high school, below 93% 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.