What is the city code for Orange County, California?

The city code for Orange County, California, is SNA, which stands for John Wayne Airport. This airport serves as the primary airport for the Orange County area and is named after the famous actor and local resident, John Wayne. Each airport has a unique three-letter code assigned to it, known as an IATA code, which is used for ticketing and identifying airports. SNA is specifically designated for John Wayne Airport, making it the correct answer for the city code in question.

In contrast, other codes mentioned relate to different locations. STL corresponds to St. Louis Lambert International Airport, TPA is the code for Tampa International Airport, and TUS is for Tucson International Airport, none of which are related to Orange County, California.