What is the city code for Oakland, California?

The city code for Oakland, California, is OAK. This code is derived from the name of the city itself, which is a common practice for airport codes. OAK is the International Air Transport Association (IATA) code used specifically for Oakland International Airport, making it easily recognizable for travelers and airlines alike.

Other options represent different cities: SMF refers to Sacramento International Airport in Sacramento, California; PDX is the code for Portland International Airport in Oregon; and SEA is the code for Seattle-Tacoma International Airport in Washington. Each of these codes corresponds to a distinct location and airport, which is why OAK is uniquely associated with Oakland.