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: 875

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
603-875 A Alton NH ALTNNHXARP0  0049 UNION TEL. CO. 122      
603-875 0 Alton NH   0049 UNION TEL. CO. 122      
603-875 2 Alton NH   0049 UNION TEL. CO. 122      
603-875 3 Alton NH   0049 UNION TEL. CO. 122      
603-875 5 Alton NH   0049 UNION TEL. CO. 122      
603-875 6 Alton NH   0049 UNION TEL. CO. 122      
603-875 7 Alton NH   0049 UNION TEL. CO. 122      
603-875 9 Alton NH   0049 UNION TEL. CO. 122      

Last updated: Wed, 20 Nov 2024 21:20:06 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.