Hillsborough is an incorporated town in San Mateo County, California, United States, in the San Francisco Bay Area. It is located 17 miles s…Hillsborough is an incorporated town in San Mateo County, California, United States, in the San Francisco Bay Area. It is located 17 miles south of San Francisco on the San Francisco Peninsula, bordered by Burlingame to the north, San Mateo to the east, Highlands-Baywood Park to the south, and Interstate 280 to the west. The population was 11,387 at the 2020 census.
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