77099 leans Democratic by roughly 24 points: about 62% of voters vote Democratic and 38% Republican.
About 30% of adults in 77099 typically vote, below the U.S. average of about 62%. Among adults in 77099, ~19% vote Democratic, ~11% Republican, and ~70% don't vote. The map below shows estimated turnout by block group.
How 77099 compares
Among zip codes within 15 miles, 77099 leans more Democratic than 39 of 63 neighbors.
77099 runs about 39 points more Democratic than Texas as a whole. Texas leans Republican overall, while 77099 is one of the few Democratic-leaning pockets.
Politics vary noticeably by block within 77099. The east side is the most Democratic-leaning (D+46) and the south side is the least Democratic-leaning (D+17), a spread of about 29 points.
Why 77099 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 77099, not a ranked or complete list of what matters most.
Dense areas vote Democratic. More than 99% of residents in 77099 live in densely developed areas, about 63 points above the U.S. average of 36%. A high never-married share predicts Democratic voting, and about 41% of adults in 77099 have never been married, above 89% of zip codes. 77099 runs against the grain of Texas, a Democratic-leaning pocket in a Republican-leaning state.
Preventive-care access and voter turnout
Places with limited routine preventive-care access tend to turn out at a lower rate; 77099, 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 77099 looks the way it does
Areas with limited routine healthcare access turn out at lower rates. 77099 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 40%, about 14 points below the Texas average of 54%. Renters vote less often than owners, and about 58% of households in 77099 rent, about 33 points above the U.S. average of 25%. Low high-school completion lines up with lower turnout, and about 73% of adults in 77099 have completed high school, below 97% 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.