closed numbering plan of the NANP. Interchangeable numbering plan area (NPA) codes and central office codes are codes that permit any of the ten numerals...

the middle digit of an area code had to be either 0 or 1, implementing fully interchangeable NPA and central office codes, that had already been anticipated...

Country calling codes, country dial-in codes, international subscriber dialing (ISD) codes, or most commonly, telephone country codes are telephone number...

Area codes 202 and 771 are telephone area codes in the North American Numbering Plan (NANP) for Washington, D.C. Area code 202 was one of the original...

NANP - Interchangeable Central Office Codes in the Toronto, Ontario, Canada 416 NPA{{cite web}}: CS1 maint: date and year (link) Area code map of Canada...

area codes assigned in 1995 (334 in Alabama, and 360 in Washington state) were the first interchangeable area codes. In 1962, AT&T assigned NPA 610 for...

distinguish the NPA codes from central office codes automatically by the switching system. Central office codes already could not have the digits 0 and 1 in either...

decided to introduce interchangeable central office codes, effective October, 1 1989. Previously, the 404 numbering plan served 640 central offices, but the...

Area codes 602, 480, and 623 are telephone area codes in the North American Numbering Plan (NANP) for most of the Phoenix metropolitan area in the U.S...

numbering plan area code (NPA code or area code), making central office codes distinctive within each numbering plan area. These codes served as prefixes...

introduction of interchangeable NPA codes, nearly all code combinations are useful as NPAs or as NXXes. Traditionally, identical central office codes in adjacent...

"interchangeable NPA codes"—area codes that did not have a 0 or 1 as the middle digit and could therefore be confused with the central office code—after...

with area codes, which had only these digits in the middle position. This last restriction was removed by 1995 with interchangeable NPA codes and the phase-out...

since the implementation of interchangeable area codes in 1995. The prefix NXX of the subscriber number is the central office code, unique in the numbering...

based on legal codes and statutes, with precedents also playing an important role. Japan has a civil law legal system with six legal codes, which were greatly...

"Number Resources - NPA (Area) Codes". NANPA. Archived from the original on 2013-11-04. Retrieved 2013-11-04. "Toll Free Calls and Telecommunications Tariffs"...

Out of Facility, used interchangeably with Out of Office and originating from the Microsoft Xenix mail system OOO – Out of Office OPEX – Operating Expenditure...

manufacture . A letter, number, or alphanumeric code indicates the place of manufacture: Other codes may indicate metal suppliers (like France or The...

10, 2023. Sources using Calabarzon and Southern Tagalog interchangeably: Nepomuceno, Priam (January 18, 2021). "3 NPA fronts in Southern Tagalog dismantled"...

States Postal Service. Accessed January 23, 2012. Area Code Lookup - NPA NXX for Evesham, NJ, Area-Codes.com. Accessed October 9, 2013. "FIPS55 Data: New Jersey"...

States Postal Service. Accessed July 10, 2012. Area Code Lookup - NPA NXX for Aberdeen, NJ, Area-Codes.com. Accessed October 28, 2013. U.S. Census website...

resulted in the interchangeable and synonymous usage of one and the other. Over half (60.3 percent) of South Asian Canadians live in the Toronto and Vancouver...