78370 leans Republican by roughly 26 points: about 37% of voters vote Democratic and 63% Republican.
About 59% of adults in 78370 typically vote, near the U.S. average of about 62%. Among adults in 78370, ~22% vote Democratic, ~37% Republican, and ~41% don't vote. The map below shows estimated turnout by block group.
How 78370 compares
Among zip codes within 15 miles, 78370 leans more Republican than 7 of 9 neighbors.
78370 runs about 11 points more Republican than Texas as a whole.
Politics vary noticeably by block within 78370. The west side is the most Republican-leaning (R+42) and the east side is the least Republican-leaning (R+9), a spread of about 34 points.
Why 78370 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 78370, not a ranked or complete list of what matters most.
Car-dependent areas vote Republican. About 86% of residents in 78370 drive to work alone, about 13 points above the U.S. average of 74%. Low college attainment predicts Republican voting, and 78370 sits in the bottom quarter (about 12%, below 90% of zip codes). A high family-household share predicts Republican voting, and about 78% of households in 78370 are family households, above 89% of zip codes.
High-school completion, uninsured rate, and voter turnout
Places that combine low high-school-completion share and a high uninsured rate tend to turn out at a lower rate, as 78370, TX does.
Why turnout in 78370 looks the way it does
Areas with limited routine healthcare access turn out at lower rates. 78370 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 48%, about 6 points below the Texas average of 54%. Low high-school completion lines up with lower turnout, and about 87% of adults in 78370 have completed high school, below 75% 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.