San Joaquin leans Democratic by roughly 24 points: about 62% of voters vote Democratic and 38% Republican.
About 42% of adults in San Joaquin typically vote, below the U.S. average of about 62%. Among adults in San Joaquin, ~26% vote Democratic, ~16% Republican, and ~58% don't vote. The map below shows estimated turnout by block group.
How San Joaquin compares
Among cities within 25 miles, San Joaquin is the most Democratic-leaning.
Politically, San Joaquin sits close to the rest of California.
Politics vary noticeably by neighborhood within San Joaquin. The north side runs the most Democratic (D+27) and the northeast side runs the most Republican (R+18), a spread of about 45 points.
Why San Joaquin 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 San Joaquin, not a ranked or complete list of what matters most.
Dense areas vote Democratic. About 56% of residents in San Joaquin live in densely developed areas, about 19 points above the U.S. average of 36%. A high never-married share predicts Democratic voting, and about 41% of adults in San Joaquin have never been married, above 94% of cities.
Preventive-care access and voter turnout
Places with limited routine preventive-care access tend to turn out at a lower rate; San Joaquin, CA 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 San Joaquin looks the way it does
Areas with limited routine healthcare access turn out at lower rates. San Joaquin 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 38%, about 24 points below the California average of 62%. Renters vote less often than owners, and about 62% of households in San Joaquin rent, about 37 points above the U.S. average of 25%. High food insecurity lines up with lower turnout, and about 47% of adults in San Joaquin report food insecurity, in the top fraction of cities. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Tranquillity, CA D+9
- Helm, CA R+21
- Kerman, CA R+6
- Cantua Creek, CA Even
- Three Rocks, CA R+4
- Raisin, CA R+25
- Mendota, CA D+12
- Rolinda, CA R+31
- Five Points, CA R+4
- Oleander, CA R+37
Cities with Similar Populations
- Moonachie, NJ R+12
- Plainview, MN R+37
- Helenwood, TN R+64
- Georgetown, IL R+44
- Sissonville, WV R+56
- Amberley, OH D+20
- Pell Lake, WI R+27
- Geneva, IN R+65
- Weyers Cave, VA R+41
- Hooks, TX R+54
All Local Stats
Home Services
Sources and methodology
Precinct-level voting records used to fit the model come from California Secretary of State, Elections, 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.