77345 leans heavily Republican by roughly 34 points: about 33% of voters vote Democratic and 67% Republican.
About 84% of adults in 77345 typically vote, above the U.S. average of about 62%. Among adults in 77345, ~28% vote Democratic, ~56% Republican, and ~16% don't vote. The map below shows estimated turnout by block group.
How 77345 compares
Among zip codes within 15 miles, 77345 leans more Republican than 12 of 16 neighbors.
77345 runs about 20 points more Republican than Texas as a whole.
Politics vary noticeably by block within 77345. The southeast side is the most Republican-leaning (R+40) and the southwest side is the least Republican-leaning (R+19), a spread of about 21 points.
Why 77345 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 77345, not a ranked or complete list of what matters most.
77345 votes Republican even though it is densely developed (about 79%, far above the Texas average of 35%). State and regional patterns outweigh the Democratic lean that density usually predicts here. A high family-household share predicts Republican voting, and about 83% of households in 77345 are family households, above 96% of zip codes.
Homeownership and voter turnout
Places with homeowner-heavy households tend to turn out at a higher rate; 77345, TX sits in the top quarter nationally on this measure.
Why turnout in 77345 looks the way it does
Areas with strong routine healthcare access turn out at higher rates. 77345 is in the top quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. The dental-visit rate here is about 71%, about 11 points above the U.S. average of 60%. Homeowners vote more often than renters, and about 89% of households in 77345 own their home, above 85% of zip codes. High high-school completion lines up with higher turnout, and about 96% of adults in 77345 have completed high school, above 85% 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.