What is the city code for Spokane, Washington?

The city code for Spokane, Washington, is GEG. This code represents Spokane International Airport, which is the main airport serving the Spokane area. The code "GEG" is derived from the name of the airport itself, which is named after the nearby Spokane city. Airport codes are often designed to reflect geographical names or the city or town that the airport serves, making it easier for travelers to identify their destinations quickly.

The other choices do not correspond to Spokane International Airport. SEA is the city code for Seattle-Tacoma International Airport, located in Seattle, Washington. SPO is not a recognized airport code for Spokane, and SMF refers to Sacramento International Airport in California. Thus, GEG is the correct representation for Spokane's airport.