77031 leans Democratic by roughly 30 points: about 65% of voters vote Democratic and 35% Republican.
About 40% of adults in 77031 typically vote, below the U.S. average of about 62%. Among adults in 77031, ~26% vote Democratic, ~14% Republican, and ~60% don't vote. The map below shows estimated turnout by block group.
How 77031 compares
Among zip codes within 15 miles, 77031 leans more Democratic than 44 of 67 neighbors.
77031 runs about 43 points more Democratic than Texas as a whole. Texas leans Republican overall, while 77031 is one of the few Democratic-leaning pockets.
Politics vary noticeably by block within 77031. The northeast side is the most Democratic-leaning (D+41) and the west side is the least Democratic-leaning (D+9), a spread of about 32 points.
Why 77031 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 77031, not a ranked or complete list of what matters most.
Dense areas vote Democratic. More than 99% of residents in 77031 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 77031 have never been married, above 89% of zip codes. 77031 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; 77031, 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 77031 looks the way it does
Areas with limited routine healthcare access turn out at lower rates. 77031 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 43%, about 10 points below the Texas average of 54%. Renters vote less often than owners, and about 54% of households in 77031 rent, about 29 points above the U.S. average of 25%. Low high-school completion lines up with lower turnout, and about 66% of adults in 77031 have completed high school, in the bottom fraction 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.