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 ...
The NANP divides the territories of its members into numbering plan areas (NPAs) which are encoded numerically with a three-digit telephone number prefix, ...
Area Codes most commonly refer to routing codes of geographic areas in the telephone numbering plan.
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 ...
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Lists of North American area codes · Original North American area codes · List of North American Numbering Plan area codes · Telephone numbers in Mexico ...