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Area Code 603

Are code 603 - Cities, Neighborhoods and local features

  • Newmarket
  • Unknown
  • Manchester
  • Nashua
  • Portsmouth
  • Lyme
  • Keene
  • Suncook
  • Salem
  • Milford
  • Errol
  • Berlin

Area code currently contains 760 valid local exchanges. Click an exchange below to get more information about the supported thousands digit of the phone number.

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