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Area codes 310 and 424

Area codes 310 and 424


Area code 310 is a California telephone area
code that was split from area code 213 on November 2, 1991. Area code 424 is an overlay of 310 that became
effective on July 26, 2006. It is the area code that covers West Los Angeles
and South Bay areas of Los Angeles County, including Santa Catalina Island south of the
mainland portion of Los Angeles County). It also includes a small portion of Ventura
County. Area code 424 is the first non-mobile area
code overlay in Southern California. Because of this, dialers in the 310 area code
are no longer able to dial a 7-digit number even if they are dialing another phone number
in the same area code. Until the overlay of area codes 657 and 714
became active in 2008, the 310-424 complex was the only area code overlay in the entire
state of California, despite California having more area codes than any other state. On January 25, 1997, it was split again, with
area code 562 having been created for the southeast portion of Los Angeles County and
a portion of Orange County. List of cities and neighborhoods in the 310
and 424 area codes Los Angeles County Splits and overlay controversy
Area code 562 was originally destined to be an overlay code for cellular telephones and
pagers for the existing 310 area, to go into service in late 1995, to be extended to overlay
the 213 and 818 areas the following year. However, the plans were changed to a simple
split of 310, as the California Public Utilities Commission decided that overlay would have
disadvantaged customers of smaller companies in requiring 10 digit dialling. The south and east portions of 310, roughly
the Gateway Cities area of Los Angeles County from Long Beach to Whittier and parts of Orange
County became area code 562 on January 25, 1997. In lieu of executing an additional split,
a new area code, the 424 overlay for the entire 310 region, was first announced in early 1999. Previously, several proposals had been made
to split 310 at Imperial Highway, a major east-west thoroughfare that marks the southern
boundary of Los Angeles International Airport. The South Bay below the boundary would have
received area code 424. South Bay governments and businesses opposed
such a move, since it would require costly changes to business cards, stationery, signage,
and other business communications. Announcement of the 424 overlay created an
uproar in Los Angeles’s politically powerful Westside community, in part because the change
would necessitate dialing 10 digits even when calling local numbers. Championed by Los Angeles Times columnist
Robert Scheer in the paper’s Santa Monica insert section, a protest movement arose in
May 1999, focusing on the idea of telephone-number conservation. In a carry-over from the analog phone-system
days, numbers were still being distributed to telephone companies in blocks of 10,000,
leading to a huge volume of unused telephone numbers in each area code. Responding to the controversy, the California
Assembly passed the Consumer Area Code Relief Act of 1999 on September 9, 1999, and the
424 overlay was tabled. Having been staved off nearly seven years,
the 424 overlay was finally implemented on July 26, 2006, and new telephone numbers issued
in the 310 area code may now begin with either 310 or 424. On December 31, 2005, customers began dialing
1 + area code + seven-digit number whenever a call is placed from the 310 area code. After July 26, 2006, customers were required
to use the new dialing procedure for all calls. See also
List of California area codes List of NANP area codes
North American Numbering Plan References External links
NANPA Area Code Map of California

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