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1. U.S. Telephone Area Code Boundaries, 2013

2011. TomTom North America, Inc. U.S. Telephone Area Code Boundaries represents the telephone area codes for the United States. They are also known as Numbering Plan Areas (NPA). T...

2. U.S. Telephone Area Code Boundaries, 2018

2018. Esri and TomTom North America, Inc. U.S. Telephone Area Code Boundaries represents the telephone area codes for the United States. They are also known as Numbering Plan Areas (NPA). T... Esri.