were is area code 603
Area code 603 is the sole area code for the U.S. state of New Hampshire in the North American Numbering Plan (NANP).The numbering plan area (NPA) was created as one of the original area codes in October 1947.As of April 2011, the 603 code was nearing exhaustion and a second area code for New Hampshire was expected to be activated by 2013.Rather than a split, the New Hampshire Public Utilities Commission recommended that it be implemented as a statewide overlay.he numbering plan area (NPA) was created as one of the original area codes in October 1947. As of April 2011, the 603 code was nearing exhaustion and a second area code for New Hampshire was expected to be activated by 2013.