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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.
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. Other countries maintain an autonomous numbering plan with distinct country codes within the international E.164 specifications by the International Telecommunication Union .
1. International access. 011. List of dialing codes. The North American Numbering Plan ( NANP) is a telephone numbering plan for twenty-five regions in twenty countries, primarily in North America and the Caribbean. This group is historically known as World Zone 1 and has the telephone country code 1. Some North American countries, most notably ...
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. Stockton, Modesto, Merced, Turlock; the northern San Joaquin Valley and the central Sierra ...
The original North American area codes were established by the American Telephone and Telegraph Company (AT&T) in 1947, after the demonstration of regional Operator Toll Dialing during the World War II period. The program had the goal of speeding the connecting times for long-distance calling by eliminating intermediary telephone operators.
This is a list of future area codes in the North American Numbering Plan (NANP) that are in the planning stages for relief of central office code exhaustion in the given numbering plan areas (NPAs). The dates are subject to change during implementation as published in the official NANP Administrator Planning Letters.
N. N11 code. North American Numbering Council. List of North American Numbering Plan area codes. North American Numbering Plan expansion. Telephone number pooling. Numbering Resource Utilization/Forecast Report.
713. Greater Houston, Texas. 289, 365. 905. Golden Horseshoe region of Ontario, including suburban Toronto, Hamilton, Oshawa, and the Niagara Peninsula in Ontario. 321. 407. Central Florida. In addition to being the sole area code in the Space Coast region around the Kennedy Space Center, this is the only partial overlay area code in North America.