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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. [1]
A numbering plan area with multiple area codes is called an overlay. 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).
Most of the Washington region's inner ring is a single local calling area, even though it is split between three area codes–the District's area code 202, Maryland's area code 301 and Northern Virginia's area code 703. For most of the second half of the 20th century, it was possible to dial any number in the metro area with just seven digits.
Original North American area codes; A. Area code 458 and 541; C. ... Enhanced 911; L. List of area code overlays; M. Mobile dial code; N. N11 code; North American ...
Public resistance to the introduction of new area codes, whether as overlay complexes (which allowed customers to keep their existing numbers, but broke seven-digit local calling) or by area code splits (where the area code of existing numbers was changed), prompted the FCC and state commissions to introduce thousands-block number pooling, i.e. the allocation of number space in blocks of only ...
The plan is for each 3-digit area code to be turned into a 4-digit area code. During the transition, the new digit will be the second digit, and will be a 9. Once the transition is over, the other numbers will be available, multiplying the number of possible area codes by about 10 (minus, of course, the few special numbers that will remain ...
Poughkeepsie, Middletown, Newburgh, West Point, Goshen and southeastern New York; overlay of 845 332: 2017: New York City: Manhattan only; overlays with 212, 646, and 917 347: 1999: New York City: all except Manhattan; overlays with 718, 917, and 929 363: 2023 Nassau County; overlay of 516 516: 1951 Nassau County; overlaid with 363 as of ...
When quoting a single area code, then use the single area code link, not the link for the overlay. For example, use [[area code 201|201]] and not [[area code 201 and 551|201]] This keeps the practice consistent in the future and discourages needless updating the links in case additional area codes are added to an overlay.