San Gregorio leans heavily Democratic by roughly 36 points: about 68% of voters vote Democratic and 32% Republican.
About 61% of adults in San Gregorio typically vote, near the U.S. average of about 62%. Among adults in San Gregorio, ~41% vote Democratic, ~20% Republican, and ~39% don't vote. The map below shows estimated turnout by block group.
How San Gregorio compares
Among cities within 25 miles, San Gregorio leans more Democratic than 15 of 54 neighbors.
San Gregorio runs about 16 points more Democratic than California as a whole.
Politics vary noticeably by neighborhood within San Gregorio. The east side is the most Democratic-leaning (D+37) and the south side is the least Democratic-leaning (D+26), a spread of about 11 points.
Why San Gregorio 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 Gregorio, not a ranked or complete list of what matters most.
Areas with high college attainment vote Democratic. About 32% of adults in San Gregorio hold a bachelor's degree, above 78% of cities.
Park access and Democratic lean
Places with heavy park coverage tend to lean Democratic; San Gregorio, CA sits in the top quarter nationally on this measure. Park access does not change how people vote; it tends to track denser, higher-income areas.
Why turnout in San Gregorio looks the way it does
Crowded housing lines up with lower turnout. About 22% of homes in San Gregorio have more than one occupant per room, in the top fraction of cities. Strong routine healthcare access lines up with higher turnout, and San Gregorio sits in the top quarter on routine-care measures. Renters vote less often than owners, and about 31% of households in San Gregorio rent, above 86% of cities. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Redwood Terrace, CA D+51
- Loma Mar, CA D+52
- Sky Londa, CA D+48
- La Honda, CA D+54
- Pescadero, CA D+34
- Portola Valley, CA D+58
- Woodside, CA D+46
- Half Moon Bay, CA D+42
- Miramar, CA D+38
- Atherton, CA D+46
Cities with Similar Populations
- Zimco, AL R+5
- Lochmere, NH R+8
- Salem Crossroads, SC D+38
- Maple View, NY R+36
- Cedar Springs, TX R+63
- Mark, IA R+62
- Pierrepont, NY R+22
- Ino, WI R+16
- Shinrock, OH R+38
- Arbela, MO R+70
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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.