San Mateo is the most populous city in the county of the same name, on the San Francisco Peninsula. About 20 miles south of San Francisco…San Mateo is the most populous city in the county of the same name, on the San Francisco Peninsula. About 20 miles south of San Francisco, the city borders Burlingame to the north, Hillsborough to the west, San Francisco Bay and Foster City to the east and Belmont to the south. The population was 105,661 at the 2020 census.
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