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Area code 847 exhausted its numbers quickly, so that an overlay area code, 224, was implemented in 1996 for relief. However, mandatory ten-digit dialing was not in effect until 2002. In March 2007, an overlay plan was created for NPA 630 adding area code 331, and 779 was added to 815. With the depletion of new numbers in area codes 312 and 773 ...
Area code 618 was assigned to a numbering plan area in southern Illinois, including the population centers of East St. Louis and Carbondale. In 1954, most of Metro East of St. Louis switched from area code 217 to 618. Projections in 2021 by the North American Numbering Plan Administrator, indicated central office code exhaustion by 2025. [3]
The state of California was divided into three numbering plan areas (NPAs) with distinct area codes: 213, 415, and 916, for the southern, central, and northern parts of the state, respectively. [1] As of July 2023, California has 38 active area codes.
Area codes are also assigned for non-geographic purposes. The rules for numbering NPAs do not permit the digits 0 and 1 in the leading position. [1] Area codes with two identical trailing digits are easily recognizable codes (ERC). NPAs with 9 in the second position are reserved for future format expansion.
This included most of Southern California, generally south and east of Los Angeles, extending to the Arizona and Nevada state lines to the east, and south as far as the Mexican border (what is now area codes 442/760, 619, 858, 909, and 951). Despite Southern California's growth in the second half of the 20th century, this configuration remained ...
The 618 area code dates to 1947. A new 730 area code overlaying the current 618 area code will be introduced in southern Illinois next year, the Illinois Commerce Commission announced Wednesday.
Area codes 213, 323, and 738 are telephone area codes in the North American Numbering Plan (NANP) for the U.S. state of California. 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 ...
An area code overlay is a numbering plan area (NPA) in the North American Numbering Plan (NANP) that has multiple area codes assigned. Overlay complexes are used to add central office prefixes in an NPA to increase the number of available telephone numbers .