South Southwest, San Antonio, TX Political Map | Democrat & Republican Areas in South Southwest

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

South Southwest leans Democratic by roughly 22 points: about 61% of voters vote Democratic and 39% Republican.

 

About 41% of adults in South Southwest typically vote, below the U.S. average of about 62%. Among adults in South Southwest, ~25% vote Democratic, ~16% Republican, and ~59% don't vote. The map below shows estimated turnout by block group.

How South Southwest compares

Among neighborhoods within 5 miles, South Southwest leans more Democratic than 1 of 10 neighbors.

South Southwest runs about 35 points more Democratic than Texas as a whole. Texas leans Republican overall, while South Southwest is one of the few Democratic-leaning pockets.

Why South Southwest leans the way it does

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

South Southwest votes against the grain of Texas. Texas leans Republican overall, while South Southwest runs about 35 points more Democratic.

Cancer-screening access and voter turnout

Places with low colon-cancer-screening access tend to turn out at a lower rate; South Southwest, San Antonio, TX sits in the bottom tenth nationally on this measure. Cancer screening does not drive turnout; it reflects income, insurance, and healthcare access.

Why turnout in South Southwest looks the way it does

Areas with limited routine healthcare access turn out at lower rates. South Southwest 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 46%, about 8 points below the Texas average of 54%. Low high-school completion lines up with lower turnout, and about 75% of adults in South Southwest have completed high school, below 91% of neighborhoods. Learn more about the findings and methodology on the political spectrum map.

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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.