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
603-261 A Merrimack NH MRMCNHGICM0  6290 UNITED STATES CELLULAR CORP. - NEW HAMPSHIRE 122      
603-261 0 Merrimack NH   5562 METRO PCS, INC. 122   2008-12-15   
603-261 1 Merrimack NH   5562 METRO PCS, INC. 122   2008-12-15   
603-261 2 Merrimack NH   4017 LEVEL 3 COMMUNICATIONS - NH 122   2010-09-27   
603-261 3 Merrimack NH   4112 COMCAST PHONE OF NEW HAMPSHIRE, LLC - NH 122   2013-11-20   
603-261 4 Merrimack NH   5562 METRO PCS, INC. 122   2014-11-06   
603-261 5 Merrimack NH   6290 UNITED STATES CELLULAR CORP. - NEW HAMPSHIRE 122      
603-261 6 Merrimack NH   6290 UNITED STATES CELLULAR CORP. - NEW HAMPSHIRE 122      
603-261 7 Merrimack NH   6290 UNITED STATES CELLULAR CORP. - NEW HAMPSHIRE 122      
603-261 8 Merrimack NH   6290 UNITED STATES CELLULAR CORP. - NEW HAMPSHIRE 122      
603-261 9 Merrimack NH   6290 UNITED STATES CELLULAR CORP. - NEW HAMPSHIRE 122      

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

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.