Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
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NPA: 603 [Rate centres in NPA 603] [Dial plan for NPA 603]

NXX: 840

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
603-840 A Epsom NH MNCHNHIE6MD  318J COMCAST IP PHONE, LLC 122      
603-840 0 Epsom NH   318J COMCAST IP PHONE, LLC 122   2010-01-25   
603-840 1 Epsom NH   6889 OMNIPOINT MIAMI E LICENSE, LLC 122   2024-04-29   
603-840 2 Epsom NH   6889 OMNIPOINT MIAMI E LICENSE, LLC 122   2024-04-29   
603-840 3 Epsom NH   073H TELNYX LLC 122   2024-07-22   
603-840 4 Epsom NH   6889 OMNIPOINT MIAMI E LICENSE, LLC 122   2024-08-16   
603-840 5 Epsom NH   6889 OMNIPOINT MIAMI E LICENSE, LLC 122   2024-08-16   
603-840 6 Epsom NH   6889 OMNIPOINT MIAMI E LICENSE, LLC 122   2024-08-16   
603-840 8 Epsom NH   6889 OMNIPOINT MIAMI E LICENSE, LLC 122   2024-06-15   
603-840 9 Epsom NH   6889 OMNIPOINT MIAMI E LICENSE, LLC 122   2024-06-15   

Last updated: Thu, 29 Jan 2026 14:35:03 UTC

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