San Geronimo is a census-designated place located in the San Geronimo Valley in Marin County, California in the United States. San Geronimo is bordered by Lagunitas-Forest Knolls to its west and Woodacre to its east. It is 8 miles southwest of downtown Novato at an elevation of 292 feet. The population was 510 at the 2020 census.
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