South Houston, TX Political Map | Democrat & Republican Areas in South Houston

By the BestNeighborhood data science team. Last updated May 2026.

South Houston leans slightly Democratic by roughly 6 points: about 53% of voters vote Democratic and 47% Republican.

 

About 33% of adults in South Houston typically vote, below the U.S. average of about 62%. Among adults in South Houston, ~17% vote Democratic, ~16% Republican, and ~67% don't vote. The map below shows estimated turnout by block group.

How South Houston compares

Among cities within 25 miles, South Houston leans more Democratic than 51 of 64 neighbors.

South Houston runs about 20 points more Democratic than Texas as a whole. Texas leans Republican overall, while South Houston is one of the few Democratic-leaning pockets.

Why South Houston leans the way it does

This analysis examined 14,881 data points per city to find what predicts political lean and turnout. The items below are a few correlations that stood out for South Houston, not a ranked or complete list of what matters most.

Dense areas vote Democratic. More than 99% of residents in South Houston live in densely developed areas, about 64 points above the U.S. average of 36%. A high never-married share predicts Democratic voting, and about 39% of adults in South Houston have never been married, above 92% of cities. South Houston runs against the grain of Texas, a Democratic-leaning pocket in a Republican-leaning state.

Population density and Democratic lean

Places with high population density tend to lean Democratic; South Houston, TX sits in the top tenth nationally on this measure.

Why turnout in South Houston looks the way it does

Areas with limited routine healthcare access turn out at lower rates. South Houston 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 42%, about 12 points below the Texas average of 54%. Renters vote less often than owners, and about 42% of households in South Houston rent, about 17 points above the U.S. average of 25%. Low high-school completion lines up with lower turnout, and about 58% of adults in South Houston have completed high school, in the bottom fraction of cities. Learn more about the findings and methodology on the political spectrum map.

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.