What city is indicated by the city code SFO?

The city code SFO represents San Francisco, California. This designation is derived from the airport code for San Francisco International Airport, which is commonly abbreviated as SFO. Airport codes typically consist of three letters and are standardized through the International Civil Aviation Organization (ICAO) and the International Air Transport Association (IATA). SFO is widely recognized in the airline industry and among travelers as the identifier for San Francisco, making it the correct choice. The other city codes listed correspond to different locations and do not align with the SFO abbreviation. Understanding these codes is crucial for those who travel frequently, as they help in identifying specific destinations and connecting flights.