Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
  • Effective date searches are available only for US area codes. Our sources for non-US NPA-NXX data do not provide this information.
  • If you want to search an entire area code regardless of activity, leave both the next and past days fields set to zero.

NPA: 603 [Rate centres in NPA 603] [Dial plan for NPA 603]

NXX:

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
603-341 A Merrimack NH MRMCNHGICM0  6290 UNITED STATES CELLULAR CORP. - NEW HAMPSHIRE 122      
603-341 0 Merrimack NH   5562 METRO PCS, INC. 122   2008-12-15   
603-341 1 Merrimack NH   5562 METRO PCS, INC. 122   2008-12-15   
603-341 2 Merrimack NH   6386 BELL ATLANTIC NYNEX MOBILE 122   2011-09-02   
603-341 3 Merrimack NH   6386 BELL ATLANTIC NYNEX MOBILE 122   2011-02-14   
603-341 4 Merrimack NH   6386 BELL ATLANTIC NYNEX MOBILE 122   2008-12-17   
603-341 5 Merrimack NH   6290 UNITED STATES CELLULAR CORP. - NEW HAMPSHIRE 122      
603-341 6 Merrimack NH   6386 BELL ATLANTIC NYNEX MOBILE 122   2016-01-22   
603-341 8 Merrimack NH   6386 BELL ATLANTIC NYNEX MOBILE 122   2013-06-28   
603-341 9 Merrimack NH   6386 BELL ATLANTIC NYNEX MOBILE 122   2014-10-01   

Last updated: Sun, 31 May 2020 11:59:01 UTC

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.