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 >>

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
603-419 8 Suncook NH MNCHNHCOX4Z  6290 UNITED STATES CELLULAR - NH 122      
603-419 9 Suncook NH MNCHNHCOX4Z  6290 UNITED STATES CELLULAR - NH 122      
603-420 A Merrimack NH MNCHNHACDS0  7778 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NH 122      
603-420 0 Merrimack NH MNCHNHCO23Z  073H TELNYX LLC 122   2022-10-21   
603-420 1 Merrimack NH   829J PAETEC ITEL, LLC 122   2001-09-24   
603-420 2 Merrimack NH MNCHNHCOX9Z  637E ONVOY, LLC - NH 122   2023-03-31   
603-420 3 Merrimack NH   6386 BELL ATLANTIC MOBILE, INC 122   2026-03-02   
603-420 4 Merrimack NH   145J TERRA NOVA TELECOM INC. 122   2025-10-29   
603-420 7 Merrimack NH MNCHNHCOX9Z  637E ONVOY, LLC - NH 122   2022-12-02   
603-420 8 Merrimack NH MNCHNHIE6MD  318J COMCAST IP PHONE, LLC 122   2009-03-22   
603-420 9 Merrimack NH MNCHNHACDS0  7778 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NH 122      
603-421 A Derry NH DRRYNHEBDS1  5113 CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 122      
603-421 0 Derry NH DRRYNHEBDS1  5113 CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 122      
603-421 1 Derry NH DRRYNHEBDS1  5113 CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 122      
603-421 2 Derry NH DRRYNHEBDS1  5113 CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 122      
603-421 3 Derry NH DRRYNHEBDS1  5113 CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 122      
603-421 4 Derry NH DRRYNHBC1MD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 122      
603-421 5 Derry NH DRRYNHEBDS1  5113 CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 122      
603-421 6 Derry NH MNCHNHCOX8Z  4017 LEVEL 3 COMMUNICATIONS, LLC - NH 122   2010-10-02   
603-421 7 Derry NH MNCHNHCOCM1  6889 OMNIPOINT MIAMI E LICENSE, LLC 122   2011-11-21   
603-421 8 Derry NH MNCHNHCOCM1  6889 OMNIPOINT MIAMI E LICENSE, LLC 122   2012-10-12   
603-421 9 Derry NH DRRYNHEBDS1  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 PTMONHISDS1  5113 CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 122      
603-422 1 Portsmouth NH PTMONHISDS1  5113 CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 122      
603-422 2 Portsmouth NH MNCHNHCOCM1  6889 OMNIPOINT MIAMI E LICENSE, LLC 122   2011-03-29   
603-422 3 Portsmouth NH MNCHNHCOCM1  6889 OMNIPOINT MIAMI E LICENSE, LLC 122   2011-03-29   
603-422 4 Portsmouth NH MNCHNHCOCM1  6889 OMNIPOINT MIAMI E LICENSE, LLC 122   2011-11-22   
603-422 5 Portsmouth NH MNCHNHCOCM1  6889 OMNIPOINT MIAMI E LICENSE, LLC 122   2011-11-22   
603-422 6 Portsmouth NH PTMONHISDS1  5113 CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 122      
603-422 7 Portsmouth NH PTMONHISDS1  5113 CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 122      
603-422 8 Portsmouth NH PTMONHISDS1  5113 CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 122      
603-422 9 Portsmouth NH PTMONHISDS1  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 MRMCNHYADS1  5113 CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 122      
603-423 1 Merrimack NH MRMCNHYADS1  5113 CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 122      
603-423 2 Merrimack NH MRMCNHYADS1  5113 CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 122      
603-423 3 Merrimack NH MRMCNHYADS1  5113 CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 122      
603-423 4 Merrimack NH MRMCNHYADS1  5113 CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 122      
603-423 5 Merrimack NH MRMCNHYADS1  5113 CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 122      
603-423 6 Merrimack NH MRMCNHYADS1  5113 CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 122      
603-423 7 Merrimack NH MNCHNHCOX9Z  637E ONVOY, LLC - NH 122   2024-08-09   
603-423 8 Merrimack NH MRMCNHYADS1  5113 CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 122      
603-423 9 Merrimack NH MRMCNHYADS1  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 DRRYNHEBDS1  5113 CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 122      
603-425 1 Derry NH DRRYNHEBDS1  5113 CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 122      
603-425 2 Derry NH DRRYNHEBDS1  5113 CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 122      
603-425 3 Derry NH DRRYNHBC1MD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 122      
603-425 4 Derry NH DRRYNHBC1MD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 122      
603-425 5 Derry NH DRRYNHEBDS1  5113 CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 122      
603-425 6 Derry NH DRRYNHEBDS1  5113 CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 122      
603-425 7 Derry NH DRRYNHEBDS1  5113 CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 122      
603-425 8 Derry NH MNCHNHACAMD  6386 BELL ATLANTIC MOBILE, INC 122   2007-09-18   
603-425 9 Derry NH MNCHNHACAMD  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 MNCHNHAC7MD  145J TERRA NOVA TELECOM INC. 122   2024-08-07   
603-426 1 Derry NH MNCHNHACAMD  6386 BELL ATLANTIC MOBILE, INC 122   2024-07-31   
603-426 2 Derry NH MNCHNHACAMD  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   
603-426 5 Derry NH DRRYNHEBDS1  5113 CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 122      
603-426 6 Derry NH   6386 BELL ATLANTIC MOBILE, INC 122   2025-03-27   
603-426 8 Derry NH DRRYNHEBDS1  5113 CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 122      
603-426 9 Derry NH DRRYNHEBDS1  5113 CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 122      
603-427 A Portsmouth NH PTMONHISPS0  5113 CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 122      
603-427 0 Portsmouth NH PTMONHISDS1  5113 CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 122      
603-427 1 Portsmouth NH PTMONHISDS1  5113 CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 122      
603-427 2 Portsmouth NH PTMONHISDS1  5113 CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 122      
603-427 3 Portsmouth NH PTMONHISDS1  5113 CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 122      
603-427 4 Portsmouth NH PTMONHISPS0  5113 CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 122      
603-427 5 Portsmouth NH PTMONHISDS1  5113 CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 122      
603-427 6 Portsmouth NH PTMONHISDS1  5113 CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 122      
603-427 7 Portsmouth NH PTMONHISDS1  5113 CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 122      
603-427 8 Portsmouth NH MNCHNHIE6MD  318J COMCAST IP PHONE, LLC 122   2011-07-13   
603-427 9 Portsmouth NH PTMONH073MD  8468 FREEDOM RING COMMUNICATIONS, LLC 122   2010-07-09   
603-428 A Henniker NH HNKRNHXARP0  3320 MERRIMACK CO. TELEPHONE CO., DBA CONTOOCOOK VALLEY 122      
603-428 0 Henniker NH HNKRNHXARP0  3320 MERRIMACK CO. TELEPHONE CO., DBA CONTOOCOOK VALLEY 122      
603-428 2 Henniker NH HNKRNHXARP0  3320 MERRIMACK CO. TELEPHONE CO., DBA CONTOOCOOK VALLEY 122      
603-428 3 Henniker NH HNKRNHXARP0  3320 MERRIMACK CO. TELEPHONE CO., DBA CONTOOCOOK VALLEY 122      
603-428 4 Henniker NH   145J TERRA NOVA TELECOM INC. 122   2025-07-11   
603-428 6 Henniker NH HNKRNHXARP0  3320 MERRIMACK CO. TELEPHONE CO., DBA CONTOOCOOK VALLEY 122      
603-428 7 Henniker NH HNKRNHXARP0  3320 MERRIMACK CO. TELEPHONE CO., DBA CONTOOCOOK VALLEY 122      
603-428 8 Henniker NH HNKRNHXARP0  3320 MERRIMACK CO. TELEPHONE CO., DBA CONTOOCOOK VALLEY 122      
603-428 9 Henniker NH MNCHNHCOCM1  6889 OMNIPOINT MIAMI E LICENSE, LLC 122   2021-05-30   
603-429 A Merrimack NH MRMCNHYADS1  5113 CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 122      
603-430 A Portsmouth NH PTMONHISDS1  5113 CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 122      
603-431 A Portsmouth NH PTMONHISDS1  5113 CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 122      
603-432 A Derry NH DRRYNHEBDS1  5113 CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 122      
603-433 A Portsmouth NH PTMONHISDS1  5113 CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 122      
603-434 A Derry NH DRRYNHEBDS1  5113 CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 122      
603-435 A Pittsfield NH PTFDNHBRRS1  5113 CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 122      
603-435 0 Pittsfield NH ROCHNHWE4MD  314C IDT AMERICA, CORP. - NH 122   2008-04-18   
603-435 1 Pittsfield NH   829J PAETEC ITEL, LLC 122   2001-11-01   
603-435 2 Pittsfield NH MNCHNHCOXCZ  996E BANDWIDTH.COM CLEC, LLC - NH 122   2002-09-19   
603-435 3 Pittsfield NH MNCHNHCOX8Z  4017 LEVEL 3 COMMUNICATIONS, LLC - NH 122   2004-09-07   
603-435 4 Pittsfield NH MNCHNHIE6MD  318J COMCAST IP PHONE, LLC 122   2010-01-25   
603-435 5 Pittsfield NH PTFDNHBRRS1  5113 CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 122      
603-435 6 Pittsfield NH PTFDNHBRRS1  5113 CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 122      

<< 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 >>

Last updated: Sat, 21 Mar 2026 23:53:39 UTC

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.