78418 leans heavily Republican by roughly 34 points: about 33% of voters vote Democratic and 67% Republican.
About 67% of adults in 78418 typically vote, near the U.S. average of about 62%. Among adults in 78418, ~22% vote Democratic, ~45% Republican, and ~33% don't vote. The map below shows estimated turnout by block group.
How 78418 compares
Among zip codes within 15 miles, 78418 leans more Republican than 10 of 12 neighbors.
78418 runs about 19 points more Republican than Texas as a whole.
Politics vary noticeably by block within 78418. The west side is the most Republican-leaning (R+40) and the northwest side is the least Republican-leaning (R+21), a spread of about 18 points.
Why 78418 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 78418, not a ranked or complete list of what matters most.
78418 votes Republican even though it is densely developed (about 69%, far above the Texas average of 35%). State and regional patterns outweigh the Democratic lean that density usually predicts here.
Population density and Democratic lean
Places with high population density tend to lean Democratic; 78418, TX sits in the top quarter nationally on this measure.
Why turnout in 78418 looks the way it does
Areas with limited routine healthcare access turn out at lower rates. 78418 is in the bottom quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. 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.