Bexar County leans slightly Democratic by roughly 14 points: about 57% of voters vote Democratic and 43% Republican.
About 52% of adults in Bexar County typically vote, below the U.S. average of about 62%. Among adults in Bexar County, ~30% vote Democratic, ~22% Republican, and ~48% don't vote. The map below shows estimated turnout by block group.
How Bexar County compares
Among counties within 50 miles, Bexar County is the most Democratic-leaning.
Bexar County runs about 28 points more Democratic than Texas as a whole. Texas leans Republican overall, while Bexar County is one of the few Democratic-leaning pockets.
Politics vary noticeably by city within Bexar County. The south side is the most Democratic-leaning (D+28) and the north side is the least Democratic-leaning (D+3), a spread of about 24 points.
Why Bexar County leans the way it does
This analysis examined 14,881 data points per county to find what predicts political lean and turnout. The items below are a few correlations that stood out for Bexar County, not a ranked or complete list of what matters most.
Dense areas vote Democratic. About 85% of residents in Bexar County live in densely developed areas, about 49 points above the U.S. average of 36%. High college attainment predicts Democratic voting, and Bexar County sits in the top quarter (about 31%, above 80% of counties). A high never-married share predicts Democratic voting, and about 37% of adults in Bexar County have never been married, above 88% of counties.
Paved land cover and Democratic lean
Places with extensive paved surfaces tend to lean Democratic; Bexar County, TX sits in the top tenth nationally on this measure. Paved ground does not change how people vote; it mostly reflects how urban and built-up a place is.
Why turnout in Bexar County looks the way it does
Areas with limited routine healthcare access turn out at lower rates. Bexar County is in the bottom quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. The uninsured rate here is about 23%, about 12 points above the U.S. average of 10%. Renters vote less often than owners, and about 38% of households in Bexar County rent, compared to around 22% in nearby counties. Learn more about the findings and methodology on the political spectrum map.
Nearby Counties
- Kendall County, TX R+49
- Guadalupe County, TX R+23
- Comal County, TX R+36
- Medina County, TX R+37
- Wilson County, TX R+50
- Atascosa County, TX R+37
- Bandera County, TX R+59
- Blanco County, TX R+53
- Hays County, TX D+4
- Kerr County, TX R+45
Counties with Similar Populations
- Broward County, FL D+20
- Santa Clara County, CA D+32
- Tarrant County, TX D+3
- San Bernardino County, CA Even
- Wayne County, MI D+33
- Clark County, NV D+12
- King County, WA D+45
- New York County, NY D+62
- Alameda County, CA D+49
- Middlesex County, MA D+37
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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.