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Telephone numbers listed in 1920 in New York City having three-letter exchange prefixes. In the United States, the most-populous cities, such as New York City, Philadelphia, Boston, and Chicago, initially implemented dial service with telephone numbers consisting of three letters and four digits (3L-4N) according to a system developed by W. G. Blauvelt of AT&T in 1917. [1]
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.
created for all of New York City; 1984: split to create 718 for Brooklyn, Queens, and Staten Island; 1992: the Bronx switched to 718; 1992: overlaid by 917; 1999: overlaid by 646; 2017: overlaid by 332; 213: California (central area of Los Angeles) 1947: created for the southern third of California; 1951: split to create 714; 1957: split to ...
They are assigned in an overlay complex to a numbering plan area (NPA) that comprises, roughly, the area of downtown Los Angeles City, as well as several southeast Los Angeles County cities, such as Bell and Huntington Park. Area code 213 was one of the original North American area codes of 1947 and 323 was created in an area code split of 213 ...
Wyoming's numbering plan area and area code (blue) Area code 307 is the telephone area code in the North American Numbering Plan for the entire U.S. state of Wyoming.It is one of the 86 original North American area codes created by the American Telephone and Telegraph Company (AT&T) in 1947.
41 (91) – Campione d'Italia, an Italian enclave. 91 is the prefix for the Swiss canton Ticino in which the enclave resides. Its phone system is fully integrated into the Swiss system. 42 – formerly assigned to Czechoslovakia, later to its breakup successors (CZ, SK) until 1997; 420 – Czech Republic; 421 – Slovakia; 422 – unassigned
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A telephone prefix is the first set of digits after the country, and area codes of a telephone number. In the North American Numbering Plan countries (country code 1), it is the first three digits of a seven-digit local phone number, the second three digits of the 3-3-4 scheme.