Fullerton, CA utilizes an area code overlay in which area codes 657 and 714 serve the same geographic area. Ten digit dialing (area code + seven digit number) is necessary.
In addition to Fullerton, CA area code information read more about area codes 657 and 714 details and California area codes.
Fullerton, CA is located in Orange County and observes the Pacific Time Zone. View our Times by Area Code tool.