San Ramon leans heavily Democratic by roughly 34 points: about 67% of voters vote Democratic and 33% Republican.
About 66% of adults in San Ramon typically vote, near the U.S. average of about 62%. Among adults in San Ramon, ~44% vote Democratic, ~22% Republican, and ~34% don't vote. The map below shows estimated turnout by block group.
How San Ramon compares
Among cities within 25 miles, San Ramon leans more Democratic than 26 of 57 neighbors.
San Ramon runs about 14 points more Democratic than California as a whole.
Politics vary noticeably by neighborhood within San Ramon. The east side is the most Democratic-leaning (D+39) and the southwest side is the least Democratic-leaning (D+24), a spread of about 16 points.
Why San Ramon 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 Ramon, not a ranked or complete list of what matters most.
Areas with high college attainment vote Democratic. About 72% of adults in San Ramon hold a bachelor's degree, about 43 points above the U.S. average of 28%. Dense areas vote Democratic, and San Ramon sits in the top fifth on density (about 78%, above 94% of cities).
Population density and Democratic lean
Places with high population density tend to lean Democratic; San Ramon, CA sits in the top tenth nationally on this measure.
Why turnout in San Ramon looks the way it does
Areas with strong routine healthcare access turn out at higher rates. San Ramon is in the top quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. The dental-visit rate here is about 74%, about 14 points above the U.S. average of 60%. High high-school completion lines up with higher turnout, and about 97% of adults in San Ramon have completed high school, above 90% of cities. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Danville, CA D+27
- Dublin, CA D+35
- Diablo, CA D+15
- Pleasanton, CA D+32
- Alamo, CA D+20
- Castro Valley, CA D+33
- Fairview, CA D+42
- Castle Hill, CA D+41
- Ashland, CA D+45
- Sunol, CA D+21
Cities with Similar Populations
- Carmel, IN D+4
- Hattiesburg, MS D+6
- Englewood, CO D+27
- Town 'n' Country, FL R+6
- Midlothian, VA Even
- Suwanee, GA Even
- Avondale, AZ D+16
- Harlingen, TX R+3
- Brooklyn Park, MN D+37
- Des Plaines, IL D+7
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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.