The 310 area code back-up contingency plan is a geographic split of the 310 area code. The split line starts at the Pacific Ocean, goes east along W. Imperial Avenue to Sepulveda Blvd. At Sepulveda Blvd., the split line runs along the Imperial Highway and W. 115th Street to South Crenshaw Blvd., which is the boundary for the 323 area code.
The 310 area code will be retained on the north side of the split line. Communities that retain the 310 area code include: a small portion of Hawthorne, the majority of Inglewood, and all of Mar Vista, Marina Del Ray, Westchester, Culver City, Venice, Santa Monica, West Los Angeles, Westwood, Beverly Hills, West Hollywood, Bel Air, Brentwood, Pacific Palisades, Malibu, small portions of Los Angeles, and a small portion of Ventura County.
The new 424 area code will be assigned on the south side of the split line. Communities that will change to the 424 area code include: a small portion of Inglewood, the majority of Hawthorne, and all of El Segundo, Lawndale, Gardena, Compton, Manhattan Beach, Hermosa Beach, Redondo Beach, Torrance, Lomita, Carson, Lynwood, Wilmington, San Pedro, the Palos Verdes Peninsula, Catalina Island, small portions of Los Angeles, and a small portion of Long Beach.
For maps of the cities impacted, select from the following PDF documents: Map #1, Map #2, and Map #3.
- MAP 1 depicts all of the rate centers in the 310 area code, some of the impacted cities, location of the split line, location of the new 424 area code, and surrounding area codes.
- MAP 2 shows a close-up of the area close to the split line where some of the street names and cities are identified.
- MAP3 shows another close-up of the area close to the split, but with more street names identified.
To find out which sets of telephone numbers will retain the 310 area code or get the new 424 area code and the corresponding rate center, please download the Exchange List (in Excel Format).
To find out which cities are associated with a certain rate center, check out Map #1, Map #2, and Map #3.
For a comparison between area code splits and overlays, check out the Comparison Grid.
See the List of Definitions for help with any terms.