79821 is a true toss-up. About 52% of voters here vote Democratic and 48% Republican.
About 36% of adults in 79821 typically vote, below the U.S. average of about 62%. Among adults in 79821, ~19% vote Democratic, ~17% Republican, and ~64% don't vote. The map below shows estimated turnout by block group.
How 79821 compares
Among zip codes within 15 miles, 79821 leans more Democratic than 10 of 18 neighbors.
79821 runs about 19 points more Democratic than Texas as a whole. Texas leans Republican overall, while 79821 is one of the few Democratic-leaning pockets.
Politics vary noticeably by block within 79821. The west side runs the most Democratic (D+10) and the southwest side runs the most Republican (R+7), a spread of about 17 points.
Why 79821 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 79821, not a ranked or complete list of what matters most.
79821 votes against the grain of Texas. Texas leans Republican overall, while 79821 runs about 19 points more Democratic.
Preventive-care access and voter turnout
Places with limited routine preventive-care access tend to turn out at a lower rate; 79821, 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 79821 looks the way it does
Areas with limited routine healthcare access turn out at lower rates. 79821 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 46%, about 7 points below the Texas average of 54%. Low high-school completion lines up with lower turnout, and about 74% of adults in 79821 have completed high school, below 96% 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.