Portola Valley, CA is a city located in San Mateo County, California and has a land area of 17.32 square miles (44.86 km2). The water area for the city is 0.09 square miles or 0.23 km2. There is one unique zip code in Portola Valley, California and it is 94028. The area code(s) for Portola Valley is 650.
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