NPA codes are more commonly referred to as area codes. NPA codes were developed by AT&T and the Bell System to divide the coverage area into "number plan areas" (abbreviated NPA). ![]() The basic format of a phone number in any of these countries is NPA-NXX-XXXX or (NPA) NXX-XXXX.Īrea codes came into use during the early 1940s. NANPA organizes the allocation of area codes and telephone prefixes to various phone companies. North American Numbering Plan Administration (NANPA). ![]() ![]() In the US and its territories, Canada, and the Caribbean, the organization and allocation of telephone numbers is governed by the
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