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Original North American area codes information


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. Expanding this technology for national use required a comprehensive and universal, continent-wide telephone numbering plan.

The new numbering plan established a uniform destination addressing and call routing system for all telephone networks in North America which had become an essential public service.[1] It had the eventual benefit of direct distance dialing (DDD) by telephone subscribers, a feature by which a caller may, without operator assistance, call any other user outside the local calling area (typically requiring extra digits to be dialed).

The initial Nationwide Numbering Plan of 1947 established eighty-six numbering plan areas (NPAs) that conformed mainly to existing U.S. state and Canadian provincial boundaries, though fifteen states and provinces were subdivided further. Forty NPAs were mapped to entire states or provinces. Each NPA was identified by a three-digit area code used as a prefix to each local telephone number. The United States received seventy-seven area codes, and Canada nine. The initial system of numbering plan areas and area codes was expanded rapidly during the ensuing decades, and established the North American Numbering Plan (NANP).

  1. ^ Hill, A.W. (1926-09-11). "Dawn of Unified Telephone Service". Telephony. 99 (11): 29. The old, and in the main, disastrous cutthroat methods formerly existing between the Bell and Independent companies are relegated to the past. The public has come to see the situation in its true light. and more and more growing is the demand for a universal telephone system, regardless of who the owner of the particular unit serving their section may be.

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Original North American area codes

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List of North American Numbering Plan area codes

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these codes were actually installed. Projected future activation date List of future North American area codes Original North American area codes Telephone...

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Lists of North American area codes

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country codes within the international E.164 specifications by the International Telecommunication Union. Original North American area codes List of North American...

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Area codes 213 and 323

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Area codes 213 and 323 are telephone area codes in the North American Numbering Plan (NANP) for the U.S. state of California. They are assigned in an...

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Area codes 702 and 725

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including Las Vegas, in the U.S. state of Nevada. Area code 702 was one of the original North American area codes established in October 1947, and serviced the...

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Area codes 415 and 628

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Area codes 415 and 628 are telephone area codes in the North American Numbering Plan (NANP) for the city of San Francisco and its northern suburbs in...

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Area codes 503 and 971

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numbering plan area (NPA) comprises the cities of Portland, Salem, and Astoria. Area code 503 was one of the original North American area codes of 1947, assigned...

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Area code 401

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of Rhode Island. 401 is one of the original North American area codes, which were established in 1947. Area code 401 is not projected to exhaust its...

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Area codes 716 and 624

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Area codes 716 and 624 are telephone area codes in the North American Numbering Plan (NANP) for Buffalo, Niagara Falls, and four surrounding counties...

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Area codes 801 and 385

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Area codes 801 and 385 are telephone area codes in the North American Numbering Plan (NANP) serving Salt Lake City and the four surrounding counties of...

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Area codes 570 and 272

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Area codes 570 and 272 are telephone area codes in the North American Numbering Plan (NANP) for the northeast quadrant of the U.S. state of Pennsylvania...

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Area codes 920 and 274

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Area codes 920 and 274 are telephone area codes in the North American Numbering Plan (NANP) for a large area of eastern Wisconsin. Area code 920 was created...

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Area codes 315 and 680

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York. Area code 315 was installed as one of the original North American area codes in 1947, while area code 680 was added to the numbering plan area (NPA)...

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Area codes 518 and 838

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the 86 original North American area codes created in 1947. Area code 838 was added to the 518 numbering plan area in 2017. The two area codes serve 24...

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Area codes 217 and 447

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List of California area codes

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American Telephone and Telegraph Company (AT&T) devised the first nationwide telephone numbering plan and assigned the original North American area codes...

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Area codes 601 and 769

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excluding the three counties of the Gulf Coast. Area code 601 was one of the original North American area codes assigned in 1947. Until 1997, it served the...

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Area codes 203 and 475

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72°54′W / 41.35°N 72.90°W / 41.35; -72.90 Area codes 203 and 475 are telephone area codes in the North American Numbering Plan (NANP) for the southwestern...

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Area codes 202 and 771

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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...

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Area code 307

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S. state of Wyoming. It is one of the 86 original North American area codes created by the American Telephone and Telegraph Company (AT&T) in 1947. Because...

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Area codes 205 and 659

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including the cities of Birmingham and Tuscaloosa. Area code 205 was one of the original North American area codes created in 1947 when AT&T created the first...

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Area codes 304 and 681

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numbering plan area was established in October 1947 with area code 304, as one of the eighty-six original North American area codes. Area code 681 was added...

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Area codes 703 and 571

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Area codes 703 and 571 are telephone area codes in the North American Numbering Plan (NANP) for Northern Virginia, including the independent cities of...

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Area codes 402 and 531

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eastern part of the U.S. state of Nebraska. Area code 402 was one of the original North American area codes created in 1947, when it was assigned to the entire...

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