78618 is a Republican stronghold. About 13% of voters here vote Democratic and 87% Republican.
About 84% of adults in 78618 typically vote, above the U.S. average of about 62%. Among adults in 78618, ~11% vote Democratic, ~73% Republican, and ~16% don't vote. The map below shows estimated turnout by block group.
How 78618 compares
78618 runs about 59 points more Republican than Texas as a whole.
Politics vary noticeably by block within 78618. The west side is the most Republican-leaning (R+76) and the north side is the least Republican-leaning (R+66), a spread of about 10 points.
Why 78618 leans the way it does
Density, race composition, education, and family structure all sit close to their national averages in 78618. The lean here lands roughly where demographic data alone would predict.
Never-married share, developed land, and voter turnout
Places that combine a low never-married share and a rural land-use pattern tend to turn out at a higher rate, as 78618, TX does.
Why turnout in 78618 looks the way it does
Homeowners vote more often than renters. About 91% of households in 78618 own their home, about 16 points above the Texas average of 75%. 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.