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: 538

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
603-538 A Pittsburg NH PSBGNHMARS1  5113 CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 122      
603-538 0 Pittsburg NH   8299 TELEPORT COMMUNICATIONS AMERICA, LLC - NH 122   2023-02-09   
603-538 1 Pittsburg NH   145J TERRA NOVA TELECOM INC. 122   2022-10-06   
603-538 3 Pittsburg NH   4017 LEVEL 3 COMMUNICATIONS, LLC - NH 122   2004-09-07   
603-538 6 Pittsburg NH   5113 CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 122      
603-538 7 Pittsburg NH   5113 CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 122      
603-538 9 Pittsburg NH   5113 CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 122      

Last updated: Thu, 01 Jan 2026 03:59:49 UTC

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