The 310 area code is located in the state of California, primarily serving the western and southwestern parts of Los Angeles County. This includes cities such as Los Angeles (west side), Beverly Hills, Santa Monica, Manhattan Beach, Torrance, Compton, Inglewood, Redondo Beach, Carson, Hawthorne, and surrounding areas. It also covers a small portion of Ventura County and Santa Catalina Island

. The 310 area code was created on November 2, 1991, as a split from the 213 area code to relieve number exhaustion. In 1997, part of the 310 area was split off to form area code 562. Since 2006, area code 424 has been an overlay for the 310 region, meaning both codes serve the same geographic area

. The 310 area code is in the Pacific Time Zone, observing Pacific Standard Time (PST) and Pacific Daylight Time (PDT) during daylight saving periods

. In summary, area code 310 covers a significant portion of western Los Angeles County and nearby areas in California, including major cities like Los Angeles, Beverly Hills, and Santa Monica. It operates in the Pacific Time Zone and shares its region with overlay area code 424