San Geronimo, CA is a city located in Marin County, California and has a land area of 1.60 square miles (4.14 km2). The water area for the city is 0.00 square miles or 0.00 km2. There is one unique zip code in San Geronimo, California and it is 94963. The area code(s) for San Geronimo is 415/628.
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