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Much of the City of Los Angeles and several inner suburbs: originally split off from 213 to form a ring around downtown Los Angeles and the city of Montebello on June 13, 1998; in August 2017, the boundary between 213 and 323 was erased to form an overlay. On November 1, 2024, it was overlaid by area code 738. 341: overlay with 510
It is the largest numbering plan area in the Commonwealth, and extends from the New York state line eastward into Worcester County (only the towns of Hardwick and Warren), while excluding the Franklin County towns of Orange, New Salem, Warwick, and Wendell, which use the overlay of area codes 978 and 351.
Area code 774 was added to the 508 numbering plan area on May 2, 2001, forming an overlay complex and making ten-digit dialing mandatory for all calls. Some mobile telephone numbers assigned in the 1990s in communities in the former northern half of 508 (now the 978 area code) kept the area code after the split. [citation needed]
The additional demands for PCS and cellular phone numbers helped necessitate the 831/408 area code split, the 650/415 split, and the earlier 510/415 split. Part of the previous dialing plan included a mass calling prefix for radio station contests, introduced in the 1960s because some contests put unacceptable loads on the Bay Area's telephone ...
Numbering plan areas and area codes since May 2001 September 1997 [1] – May 2001 [2] July 1988 [3] – September 1997 [4] [5] October 1947 – July 1988 [6]. Massachusetts is divided into five distinct numbering plan areas (NPAs), which are served by nine area codes in the North American Numbering Plan (NANP), [7] organized as four overlay complexes and a single-area code NPA.
Major cities and towns with the area code include Waltham, Woburn, Lynn, Weymouth and Dedham. It was created as in an area code split of area code 617 on September 1, 1997. [1] Use of 781 became mandatory February 1, 1998. [2] Area code 339 is an overlay complex code for the same service area, activated on May 2, 2001. [3]
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They cover parts of Contra Costa County and western Alameda County, including the city of Oakland, but excluding Dublin, Livermore, Pleasanton, and Sunol. Area code 510 was established on September 2, 1991, in a split from area code 415. [1] On March 14, 1998, the inland portion of the East Bay was split off as area code 925.