What is the city code for Spokane, Washington?

The city code for Spokane, Washington, is GEG. This code is derived from the name of Spokane International Airport, which is where Southwest Airlines operates flights to and from Spokane. The "GEG" code is the official IATA airport code that identifies this particular location in air travel databases and systems.

In understanding the other choices, "SEA" represents Seattle-Tacoma International Airport, which is located in Washington but refers to a different city. "SLC" stands for Salt Lake City International Airport in Utah, and "PNA" does not correspond to any recognized airport code in the context of Spokane or general air travel. Thus, GEG is the distinct and accurate identifier for Spokane.