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Each NPA is identified by one or more numbering plan area codes (NPA codes, or area codes), consisting of three digits that are prefixed to each local telephone number having seven digits. A numbering plan area with multiple area codes is called an overlay. Area codes are also assigned for non-geographic purposes.
The area code is prefixed to each telephone number issued in its service area. Other national telecommunication authorities use various formats and dialing rules for area codes. The size of area code prefixes may either be fixed or variable.
Numbering plan areas and area codes of Texas (tan). This is a list of area codes in the U.S. state of Texas. The date of establishment of each area code is indicated in parentheses: 210: San Antonio area; overlays with 726 (November 1, 1992) 214: Dallas area, overlays with 469, 972, and 945 (October 1947)
Area code 876 was created on 1 May 1997 for Jamaica. [1] In 2019, the numbering plan area received a second area code, 658, in formation of an overlay to relieve central office code exhaustion. The telephone country code for reaching telephone numbers in the country is 1.
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 North American area codes established in October 1947 by AT&T .
Lists of North American area codes. The largest telephone numbering plan in North American is the North American Numbering Plan (NANP), serving 25 regions or countries.