Muir Beach leans heavily Democratic by roughly 46 points: about 73% of voters vote Democratic and 27% Republican.
About 38% of adults in Muir Beach typically vote, below the U.S. average of about 62%. Among adults in Muir Beach, ~27% vote Democratic, ~10% Republican, and ~63% don't vote. The map below shows estimated turnout by block group.
How Muir Beach compares
Among cities within 25 miles, Muir Beach leans more Democratic than 24 of 65 neighbors.
Muir Beach runs about 26 points more Democratic than California as a whole.
Why Muir Beach 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 Muir Beach, not a ranked or complete list of what matters most.
Areas with high college attainment vote Democratic. About 75% of adults in Muir Beach hold a bachelor's degree, about 47 points above the U.S. average of 28%. A high never-married share predicts Democratic voting, and about 39% of adults in Muir Beach have never been married, above 93% of cities.
Preventive-care access and voter turnout
Places with strong routine preventive-care access tend to turn out at a higher rate; Muir Beach, 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 Muir Beach looks the way it does
Renters vote less often than owners. About 30% of households in Muir Beach rent, above 83% of cities. Strong routine healthcare access lines up with higher turnout, and Muir Beach sits in the top quarter on routine-care measures. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Tamalpais-Homestead Valley, CA D+62
- Mill Valley, CA D+55
- Sausalito, CA D+59
- Stinson Beach, CA D+36
- Corte Madera, CA D+56
- Tiburon, CA D+44
- Larkspur, CA D+58
- Belvedere-Tiburon, CA D+42
- Greenbrae, CA D+51
- Belvedere, CA D+51
Cities with Similar Populations
- Shanghai, NC R+11
- Sterling Center, MN R+42
- Donie, TX R+69
- Grass Valley, OR R+63
- Lone Pine, LA R+70
- Pons, VA R+25
- McClures Bend, TN R+66
- Neutral, KS R+68
- Wendel, WV R+58
- Suttons, SC D+14
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.