Greenbrae is a Democratic stronghold. About 76% of voters here vote Democratic and 24% Republican.
About 64% of adults in Greenbrae typically vote, near the U.S. average of about 62%. Among adults in Greenbrae, ~48% vote Democratic, ~15% Republican, and ~37% don't vote. The map below shows estimated turnout by block group.
How Greenbrae compares
Among cities within 25 miles, Greenbrae leans more Democratic than 43 of 70 neighbors.
Greenbrae runs about 31 points more Democratic than California as a whole.
Why Greenbrae 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 Greenbrae, not a ranked or complete list of what matters most.
Areas with high college attainment vote Democratic. About 69% of adults in Greenbrae hold a bachelor's degree, about 40 points above the U.S. average of 28%. Dense areas vote Democratic, and Greenbrae sits in the top fifth on density (about 41%, above 84% of cities). A high never-married share predicts Democratic voting, and about 34% of adults in Greenbrae have never been married, above 85% of cities.
Preventive-care access and voter turnout
Places with strong routine preventive-care access tend to turn out at a higher rate; Greenbrae, 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 Greenbrae looks the way it does
Areas with strong routine healthcare access turn out at higher rates. Greenbrae 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 77%, about 17 points above the U.S. average of 60%. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Kentfield, CA D+54
- Larkspur, CA D+58
- Ross, CA D+52
- Corte Madera, CA D+56
- San Quentin, CA D+41
- San Rafael, CA D+46
- Mill Valley, CA D+55
- San Anselmo, CA D+60
- Fairfax, CA D+73
- Tamalpais-Homestead Valley, CA D+62
Cities with Similar Populations
- Yost, VA R+59
- Yankeetown, IN R+46
- Oakley, SC R+12
- Delta, LA R+73
- Hickory Hill, AR R+56
- Manila, CA D+34
- Somerton, OH R+65
- Doe Hill, VA R+51
- Turnertown, TX R+60
- North Bethel, ME R+14
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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.