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.

Switch: MNCHNHCO37Z

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
603-373 2 Portsmouth NH 7421 AT&T - LOCAL 122   2001-07-01   
603-453 A Hampstead NH 7421 AT&T - LOCAL 122      
603-453 9 Hampstead NH 7421 AT&T - LOCAL 122   2021-07-07   
603-518 A Manchester NH 7421 AT&T - LOCAL 122      
603-518 9 Manchester NH 7421 AT&T - LOCAL 122      
603-573 3 Concord NH 7421 AT&T - LOCAL 122   2000-12-15   
603-573 4 Concord NH 7421 AT&T - LOCAL 122   2002-09-09   

Last updated: Thu, 20 Nov 2025 13:34:34 UTC

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.