78580 is a true toss-up. About 48% of voters here vote Democratic and 52% Republican.
About 42% of adults in 78580 typically vote, below the U.S. average of about 62%. Among adults in 78580, ~20% vote Democratic, ~22% Republican, and ~58% don't vote. The map below shows estimated turnout by block group.
How 78580 compares
Among zip codes within 15 miles, 78580 is the least Republican-leaning.
78580 runs about 9 points more Democratic than Texas as a whole.
Politics vary noticeably by block within 78580. The northeast side is the most split-leaning (R+39) and the west side is the least split-leaning (R+3), a spread of about 36 points.
Why 78580 leans the way it does
Density, race composition, education, and family structure all sit close to their national averages in 78580. The lean here lands roughly where demographic data alone would predict.
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 78580, TX does.
Why turnout in 78580 looks the way it does
Areas with limited routine healthcare access turn out at lower rates. 78580 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 39%, about 15 points below the Texas average of 54%. Low high-school completion lines up with lower turnout, and about 72% of adults in 78580 have completed high school, below 97% of zip codes. High-crime urban areas turn out at lower rates, and 78580 sits in the top 15% on a violent-crime measure. 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.