Oceanside, CA utilizes an area code overlay in which area codes 442 and 760 serve the same geographic area. The area code overlay which is in use today was established in 2009 at which time area code 442 was created as an overlay of area code 760. Area code 760 was created from a split of area code 619 and put into service in 1997. Ten digit dialing (area code + seven digit number) is necessary because two different homes in the same geographic area can have the same seven digit phone number but each would have a different area code.
In addition to Oceanside, CA area codes 442 and 760 serve most of southeastern California including the larger communities of Apple Valley, Barstow, Bishop, Brawley, Bridgeport, Calexico, Carlsbad, Cathedral City, Coachella, El Centro, Encinitas, Escondido, Fallbrook, Hesperia, Indio, La Quinta, Oceanside, Palm Desert, Palm Springs, Ridgecrest, San Marcos, Victorville, and Vista in addition to many smaller communities within the service area.
Oceanside, CA is located in San Diego County and observes the Pacific Time Zone. View our Times by Area Code tool.