Jefferson leans heavily Democratic by roughly 36 points: about 68% of voters vote Democratic and 32% Republican.
About 52% of adults in Jefferson typically vote, below the U.S. average of about 62%. Among adults in Jefferson, ~35% vote Democratic, ~17% Republican, and ~48% don't vote. The map below shows estimated turnout by block group.
How Jefferson compares
Among neighborhoods within 5 miles, Jefferson leans more Democratic than 25 of 36 neighbors.
Jefferson runs about 50 points more Democratic than Texas as a whole. Texas leans Republican overall, while Jefferson is one of the few Democratic-leaning pockets.
Politics vary noticeably by block within Jefferson. The west side is the most Democratic-leaning (D+48) and the northwest side is the least Democratic-leaning (D+27), a spread of about 21 points.
Why Jefferson 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 Jefferson, not a ranked or complete list of what matters most.
Dense areas vote Democratic. More than 99% of residents in Jefferson live in densely developed areas, about 64 points above the U.S. average of 36%. Jefferson 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; Jefferson, San Antonio, TX sits in the top quarter nationally on this measure.
Why turnout in Jefferson looks the way it does
Areas with limited routine healthcare access turn out at lower rates. Jefferson 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 28%, about 9 points above the Texas average of 19%. Low high-school completion lines up with lower turnout, and about 78% of adults in Jefferson have completed high school, below 88% of neighborhoods. Learn more about the findings and methodology on the political spectrum map.
Nearby Neighborhoods
- Jefferson-Woodlawn Lake, San Antonio, TX D+36
- Los Angeles Heights-Keystone, San Antonio, TX D+36
- Laddie Place and North Wilson, San Antonio, TX D+30
- Woodlawn Lake, San Antonio, TX D+37
- Donaldson Terrace, San Antonio, TX D+31
- Northwest Los Angeles Heights, San Antonio, TX D+32
- University Park-San Antonio, San Antonio, TX D+30
- Beacon Hill, San Antonio, TX D+43
- Edison, San Antonio, TX D+35
- Dellview Area, San Antonio, TX D+24
Neighborhoods with Similar Populations
- Middletown, San Diego, CA D+47
- Harbor, Ashtabula, OH R+7
- Westgate, Fargo, ND D+10
- Downtown Springfield, Springfield, MO D+19
- Rock Creek Lexington Road, Louisville, KY D+35
- Duval, Jacksonville, FL R+21
- Paradise Valley, South San Francisco, CA D+42
- Beulah Heights, Pueblo, CO D+10
- Courier City, Tampa, FL Even
- Caufield, Oregon City, OR R+3
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.