Original North American area codes
http://dbpedia.org/resource/Original_North_American_area_codes
The original North American area codes were established by the American Telephone & Telegraph Company (AT&T) in the years immediately following World War II. Creating a comprehensive and universal, continent-wide telephone numbering plan was a basic requirement for nationwide Operator Toll Dialing which had the goal of speeding the connecting times for long-distance calling by eliminating intermediary telephone operators. It had the eventual benefit of direct distance dialing (DDD) by telephone subscribers. It established a uniform destination addressing and call routing system for all telephone networks in North America that had become an essential public service.
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Original North American area codes
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The original North American area codes were established by the American Telephone & Telegraph Company (AT&T) in the years immediately following World War II. Creating a comprehensive and universal, continent-wide telephone numbering plan was a basic requirement for nationwide Operator Toll Dialing which had the goal of speeding the connecting times for long-distance calling by eliminating intermediary telephone operators. It had the eventual benefit of direct distance dialing (DDD) by telephone subscribers. It established a uniform destination addressing and call routing system for all telephone networks in North America that had become an essential public service. The initial Nationwide Numbering Plan of 1947 established eighty-six numbering plan areas (NPAs) that principally followed existing U.S. state or Canadian provincial boundaries, but 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 77 area codes, and Canada nine. The initial system of numbering plan areas and area codes was expanded rapidly in the following decades, and established the North American Numbering Plan (NANP).
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39545
