San Geronimo is a Democratic stronghold. About 76% of voters here vote Democratic and 24% Republican.
About 82% of adults in San Geronimo typically vote, above the U.S. average of about 62%. Among adults in San Geronimo, ~62% vote Democratic, ~20% Republican, and ~18% don't vote. The map below shows estimated turnout by block group.
How San Geronimo compares
Among cities within 25 miles, San Geronimo leans more Democratic than 37 of 59 neighbors.
San Geronimo runs about 31 points more Democratic than California as a whole.
Why San Geronimo 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 Geronimo, not a ranked or complete list of what matters most.
Areas with high college attainment vote Democratic. About 84% of adults in San Geronimo hold a bachelor's degree, about 55 points above the U.S. average of 28%. A high never-married share predicts Democratic voting, and about 33% of adults in San Geronimo have never been married, above 84% of cities.
Preventive-care access and voter turnout
Places with strong routine preventive-care access tend to turn out at a higher rate; San Geronimo, CA sits in the top 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 Geronimo looks the way it does
Areas with strong routine healthcare access turn out at higher rates. San Geronimo 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 98% of adults in San Geronimo have completed high school, above 94% of cities. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Lagunitas-Forest Knolls, CA D+60
- Forest Knolls, CA D+60
- Woodacre, CA D+52
- Lagunitas, CA D+63
- Nicasio, CA D+47
- Sleepy Hollow, CA D+55
- Fairfax, CA D+73
- Tocaloma, CA D+43
- San Anselmo, CA D+60
- Olema, CA D+43
Cities with Similar Populations
- Spring Prairie, WI R+27
- Dale, IL R+63
- Pemaquid, ME D+21
- Norwood, KY D+18
- Frost, MN R+47
- Bays, KY R+70
- Coopers Mills, ME R+29
- Belle Valley, OH R+60
- Gene Autry, OK R+58
- Fame, MS R+87
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.