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The city code for Palm Springs, California is PSP. This three-letter code is part of the IATA (International Air Transport Association) coding system, which assigns unique identifiers to airports around the world. PSP specifically designates Palm Springs International Airport, the primary airport serving the Palm Springs area, making it the appropriate choice for travelers flying to or from this destination.

The other codes listed correspond to different airports in California: SFO is the code for San Francisco International Airport, LAX represents Los Angeles International Airport, and SMF is for Sacramento International Airport. Each of these codes pertains to major airports in their respective cities, emphasizing the distinct identity of Palm Springs as indicated by its unique airport code, PSP. This differentiation is crucial for effective communication in air travel, ensuring that passengers clearly identify their intended destinations.