Millbrae is a city located in northern San Mateo County, California, United States. To the northeast is San Francisco International Airport; San B…Millbrae is a city located in northern San Mateo County, California, United States. To the northeast is San Francisco International Airport; San Bruno is to the northwest, and Burlingame is to the southeast. It is bordered by San Andreas Lake to the southwest. The population was 23,216 at the 2020 census.
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