List of original NANP area codes
original area codesoriginal 86 area codesoriginal numbering plan areas86 allocated area codes86 original area codes86 three-digit routing codesarea codeseighty-six area codesinitial 86 area codesinitial area code
This is the list of original North American Numbering Plan area codes of 86 plan areas as defined by AT&T in 1947.wikipedia
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