Airport in San Mateo County, California, United States
San Francisco International Airport (IATA: SFO, ICAO: KSFO, FAA LID: SFO) is the primary international airport for the San Francisco Bay Area in the U.S. state of California. Owned and operated by the City and County of San Francisco, the airport has a San Francisco mailing address and ZIP Code, although it is situated in an unincorporated area of neighboring San Mateo County, approximately 12 miles (19 km; 10 nmi) southeast of San Francisco. SFO is the largest airport in the Bay Area and the second-busiest in the US State of California, following Los Angeles International Airport (LAX).
https://en.wikipedia.org/wiki/San_Francisco_International_Airport