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]

<< 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 >>

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
603-421 0 Derry NH   5113 CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 122      
603-421 1 Derry NH   5113 CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 122      
603-421 2 Derry NH   5113 CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 122      
603-421 3 Derry NH   5113 CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 122      
603-421 4 Derry NH   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 122      
603-421 5 Derry NH   5113 CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 122      
603-421 6 Derry NH   4017 LEVEL 3 COMMUNICATIONS, LLC - NH 122   2010-10-02   
603-421 7 Derry NH   6889 OMNIPOINT MIAMI E LICENSE, LLC 122   2011-11-21   
603-421 8 Derry NH   6889 OMNIPOINT MIAMI E LICENSE, LLC 122   2012-10-12   
603-421 9 Derry NH   5113 CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 122      
603-422 A Portsmouth NH PTMONHISDS1  5113 CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 122      
603-422 0 Portsmouth NH   5113 CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 122      
603-422 1 Portsmouth NH   5113 CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 122      
603-422 2 Portsmouth NH   6889 OMNIPOINT MIAMI E LICENSE, LLC 122   2011-03-29   
603-422 3 Portsmouth NH   6889 OMNIPOINT MIAMI E LICENSE, LLC 122   2011-03-29   
603-422 4 Portsmouth NH   6889 OMNIPOINT MIAMI E LICENSE, LLC 122   2011-11-22   
603-422 5 Portsmouth NH   6889 OMNIPOINT MIAMI E LICENSE, LLC 122   2011-11-22   
603-422 6 Portsmouth NH   5113 CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 122      
603-422 7 Portsmouth NH   5113 CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 122      
603-422 8 Portsmouth NH   5113 CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 122      
603-422 9 Portsmouth NH   5113 CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 122      
603-423 A Merrimack NH MRMCNHYADS1  5113 CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 122      
603-423 0 Merrimack NH   5113 CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 122      
603-423 1 Merrimack NH   5113 CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 122      
603-423 2 Merrimack NH   5113 CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 122      
603-423 3 Merrimack NH   5113 CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 122      
603-423 4 Merrimack NH   5113 CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 122      
603-423 5 Merrimack NH   5113 CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 122      
603-423 6 Merrimack NH   5113 CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 122      
603-423 7 Merrimack NH   637E ONVOY, LLC - NH 122   2024-08-09   
603-423 8 Merrimack NH   5113 CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 122      
603-423 9 Merrimack NH   5113 CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 122      
603-424 A Merrimack NH MRMCNHYADS1  5113 CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 122      
603-425 A Derry NH DRRYNHEBDS1  5113 CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 122      
603-425 0 Derry NH   5113 CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 122      
603-425 1 Derry NH   5113 CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 122      
603-425 2 Derry NH   5113 CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 122      
603-425 3 Derry NH   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 122      
603-425 4 Derry NH   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 122      
603-425 5 Derry NH   5113 CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 122      
603-425 6 Derry NH   5113 CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 122      
603-425 7 Derry NH   5113 CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 122      
603-425 8 Derry NH   6386 BELL ATLANTIC MOBILE, INC 122   2007-09-18   
603-425 9 Derry NH   6386 BELL ATLANTIC MOBILE, INC 122   2009-08-01   
603-426 A Derry NH DRRYNHEBDS1  5113 CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 122      
603-426 0 Derry NH   145J TERRA NOVA TELECOM INC. 122   2024-08-07   
603-426 1 Derry NH   6386 BELL ATLANTIC MOBILE, INC 122   2024-07-31   
603-426 2 Derry NH   6386 BELL ATLANTIC MOBILE, INC 122   2024-09-11   
603-426 3 Derry NH   6386 BELL ATLANTIC MOBILE, INC 122   2025-02-18   
603-426 4 Derry NH   145J TERRA NOVA TELECOM INC. 122   2025-04-09   

<< 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 >>

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

Sponsored by: BeeVox - Whitelabel Reseller Platform

Like this site? We accept donations via PayPal.