San Diego, California

San Diego is a major city in the state of California and is mentioned in AMC's Fear The Walking Dead.

Post-Apocalypse
By the time of The Walking Dead, it's extremely likely that the city has long fallen along with Los Angeles and Atlanta, although nothing is ultimately certain.

By the time of Fear, it is strongly hinted by survivors like Castro or Richards that the city might have elements of the California National Guard in operation as of "Cobalt", as they were heading to the city. However, it's unknown if that still remains true.