78339 is a true toss-up. About 49% of voters here vote Democratic and 51% Republican.
About 56% of adults in 78339 typically vote, below the U.S. average of about 62%. Among adults in 78339, ~28% vote Democratic, ~29% Republican, and ~43% don't vote. The map below shows estimated turnout by block group.
How 78339 compares
Among zip codes within 15 miles, 78339 sits roughly in the middle of the political spectrum, with 0 neighbors leaning further in the place's direction and 6 leaning the other way.
78339 runs about 11 points more Democratic than Texas as a whole.
Politics vary noticeably by block within 78339. The east side runs the most Democratic (Even) and the north side runs the most Republican (R+21), a spread of about 22 points.
Why 78339 leans the way it does
Density, race composition, education, and family structure all sit close to their national averages in 78339. The lean here lands roughly where demographic data alone would predict.
Preventive-care access and voter turnout
Places with limited routine preventive-care access tend to turn out at a lower rate; 78339, TX sits in the bottom tenth nationally on this measure. Dental visits do not drive turnout; the rate reflects income, insurance, and healthcare access, which line up with who votes.
Why turnout in 78339 looks the way it does
Areas with limited routine healthcare access turn out at lower rates. 78339 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 41%, about 12 points below the Texas average of 54%. Renters vote less often than owners, and about 56% of households in 78339 rent, compared to around 28% in nearby zip codes. Low high-school completion lines up with lower turnout, and about 73% of adults in 78339 have completed high school, below 97% 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.