Forest Knolls, CA is a city located in Marin County, California and has a land area of 3.21 square miles (8.31 km2). The water area for the city is 0.00 square miles or 0.00 km2. There is one unique zip code in Forest Knolls, California and it is 94933. The area code(s) for Forest Knolls is 415/628.
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