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 >>

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
603-251 A Charlestown NH   829J PAETEC ITEL, LLC 122   2025-04-30   
603-251 0 Charlestown NH MNCHNHCO23Z  073H TELNYX LLC 122   2024-07-27   
603-251 1 Charlestown NH   829J PAETEC ITEL, LLC 122   2012-04-27   
603-252 A West Lebanon NH MNCHNHCOX4Z  6290 UNITED STATES CELLULAR - NH 122      
603-253 A Center Harbor NH CNHRNHPLRS1  5113 CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 122      
603-253 0 Center Harbor NH   829J PAETEC ITEL, LLC 122   2002-09-10   
603-253 1 Center Harbor NH MNCHNHCO42Z  793K TWC IP ENABLED SERVICES, LLC 122   2006-10-30   
603-253 2 Center Harbor NH MNCHNHCOX8Z  4017 LEVEL 3 COMMUNICATIONS, LLC - NH 122   2004-09-04   
603-253 3 Center Harbor NH CNHRNHPLRS1  5113 CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 122      
603-253 4 Center Harbor NH CNHRNHPLRS1  5113 CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 122      
603-253 5 Center Harbor NH MNCHNHCO42Z  793K TWC IP ENABLED SERVICES, LLC 122   2012-10-02   
603-253 6 Center Harbor NH CNHRNHPLRS1  5113 CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 122      
603-253 7 Center Harbor NH CNHRNHPLRS1  5113 CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 122      
603-253 8 Center Harbor NH CNHRNHPLRS1  5113 CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 122      
603-253 9 Center Harbor NH CNHRNHPLRS1  5113 CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 122      
603-254 A Plymouth NH MNCHNHCOX4Z  6290 UNITED STATES CELLULAR - NH 122      
603-254 0 Plymouth NH DRRYNHBC1MD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 122   2013-03-12   
603-254 1 Plymouth NH DRRYNHBC1MD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 122   2015-05-13   
603-254 2 Plymouth NH MNCHNHCOX4Z  6290 UNITED STATES CELLULAR - NH 122      
603-254 3 Plymouth NH MNCHNHCOX4Z  6290 UNITED STATES CELLULAR - NH 122      
603-254 4 Plymouth NH MNCHNHCOX4Z  6290 UNITED STATES CELLULAR - NH 122      
603-254 5 Plymouth NH MNCHNHCOX4Z  6290 UNITED STATES CELLULAR - NH 122      
603-254 6 Plymouth NH MNCHNHCOX4Z  6290 UNITED STATES CELLULAR - NH 122      
603-254 7 Plymouth NH MNCHNHCOX4Z  6290 UNITED STATES CELLULAR - NH 122      
603-254 8 Plymouth NH MNCHNHCOX4Z  6290 UNITED STATES CELLULAR - NH 122      
603-254 9 Plymouth NH MNCHNHCOX4Z  6290 UNITED STATES CELLULAR - NH 122      
603-255 A Manchester NH MNCHNHCOY0X  425J CSC WIRELESS, LLC 122      
603-255 0 Manchester NH DOVRNHTHGMD  624H ONVOY SPECTRUM, LLC 122   2022-01-07   
603-255 1 Manchester NH DOVRNHTHGMD  624H ONVOY SPECTRUM, LLC 122   2022-01-07   
603-255 2 Manchester NH MNCHNHCOY0X  425J CSC WIRELESS, LLC 122   2020-04-17   
603-255 3 Manchester NH MNCHNHCOX9Z  637E ONVOY, LLC - NH 122   2020-05-10   
603-255 4 Manchester NH MNCHNHCOX9Z  637E ONVOY, LLC - NH 122   2020-06-01   
603-255 5 Manchester NH MNCHNHCOX9Z  637E ONVOY, LLC - NH 122   2020-07-02   
603-255 6 Manchester NH DOVRNHTHXEX  8299 TELEPORT COMMUNICATIONS AMERICA, LLC - NH 122   2020-05-23   
603-255 7 Manchester NH MNCHNHCOX9Z  637E ONVOY, LLC - NH 122   2020-09-18   
603-255 8 Manchester NH MNCHNHCOX9Z  637E ONVOY, LLC - NH 122   2021-03-08   
603-255 9 Manchester NH DOVRNHTHXJX  478J NUSO, LLC 122   2020-10-15   
603-256 A West Chesterfield NH BRBOVTMADS0  5113 CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 122      
603-256 1 West Chesterfield NH MNCHNHCO42Z  793K TWC IP ENABLED SERVICES, LLC 122   2024-01-07   
603-256 2 West Chesterfield NH MNCHNHCOX9Z  637E ONVOY, LLC - NH 122   2023-03-30   
603-256 3 West Chesterfield NH BRBOVTMADS0  5113 CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 122      
603-256 4 West Chesterfield NH BRBOVTMADS0  5113 CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 122      
603-256 5 West Chesterfield NH MNCHNHCOX9Z  637E ONVOY, LLC - NH 122   2022-01-15   
603-256 6 West Chesterfield NH BRBOVTMADS0  5113 CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 122      
603-256 7 West Chesterfield NH PTMONH073MD  8468 FREEDOM RING COMMUNICATIONS, LLC 122   2001-02-06   
603-256 8 West Chesterfield NH BRBOVTMADS0  5113 CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 122      
603-256 9 West Chesterfield NH MNCHNHCOX9Z  637E ONVOY, LLC - NH 122   2023-09-28   
603-257 A Plaistow NH PTMONH073MD  8468 FREEDOM RING COMMUNICATIONS, LLC 122      
603-257 0 Plaistow NH MNCHNHACAMD  6386 BELL ATLANTIC MOBILE, INC 122   2016-11-16   
603-257 1 Plaistow NH PTMONH073MD  8468 FREEDOM RING COMMUNICATIONS, LLC 122      
603-257 2 Plaistow NH MNCHNHCO23Z  073H TELNYX LLC 122   2023-03-20   
603-257 5 Plaistow NH   829J PAETEC ITEL, LLC 122   2010-08-10   
603-257 6 Plaistow NH DOVRNHTHXEX  8299 TELEPORT COMMUNICATIONS AMERICA, LLC - NH 122   2019-05-16   
603-257 7 Plaistow NH   829J PAETEC ITEL, LLC 122   2007-05-04   
603-257 9 Plaistow NH PTMONH073MD  8468 FREEDOM RING COMMUNICATIONS, LLC 122      
603-258 A Hollis NH MNCHNHCOCM1  5562 METROPCS, INC. 122      
603-258 0 Hollis NH DRRYNHBC1MD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 122   2020-02-15   
603-258 1 Hollis NH DRRYNHBC1MD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 122   2023-07-02   
603-258 8 Hollis NH DRRYNHBC1MD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 122   2023-09-08   
603-258 9 Hollis NH MNCHNHCOCM1  5562 METROPCS, INC. 122   2017-06-05   
603-259 A Littleton NH MNCHNHCOX8Z  4017 LEVEL 3 COMMUNICATIONS, LLC - NH 122      
603-259 0 Littleton NH PTMONH073MD  9827 OTEL TELEKOM, INC. - NH 122   2004-10-09   
603-259 1 Littleton NH MNCHNHCOX8Z  4017 LEVEL 3 COMMUNICATIONS, LLC - NH 122   2005-09-15   
603-259 2 Littleton NH PTMONH073MD  9827 OTEL TELEKOM, INC. - NH 122   2002-09-19   
603-259 3 Littleton NH MNCHNHAC7MD  145J TERRA NOVA TELECOM INC. 122   2024-10-12   
603-259 4 Littleton NH MNCHNHCOX8Z  4017 LEVEL 3 COMMUNICATIONS, LLC - NH 122      
603-259 5 Littleton NH   145J TERRA NOVA TELECOM INC. 122   2022-10-06   
603-259 6 Littleton NH MNCHNHACAMD  6386 BELL ATLANTIC MOBILE, INC 122   2008-12-04   
603-259 7 Littleton NH   829J PAETEC ITEL, LLC 122   2007-01-05   
603-259 8 Littleton NH MNCHNHCO23Z  073H TELNYX LLC 122   2024-06-30   
603-260 A Derry NH MNCHNHIE6MD  318J COMCAST IP PHONE, LLC 122      
603-260 0 Derry NH MNCHNHACAMD  6386 BELL ATLANTIC MOBILE, INC 122   2014-03-01   
603-260 1 Derry NH MNCHNHACAMD  6386 BELL ATLANTIC MOBILE, INC 122   2014-05-01   
603-260 2 Derry NH MNCHNHACAMD  6386 BELL ATLANTIC MOBILE, INC 122   2014-08-01   
603-260 3 Derry NH MNCHNHACAMD  6386 BELL ATLANTIC MOBILE, INC 122   2015-06-01   
603-260 4 Derry NH MNCHNHACAMD  6386 BELL ATLANTIC MOBILE, INC 122   2015-03-01   
603-260 5 Derry NH MNCHNHIE6MD  318J COMCAST IP PHONE, LLC 122   2013-06-01   
603-260 6 Derry NH MNCHNHIE6MD  318J COMCAST IP PHONE, LLC 122   2014-09-05   
603-260 7 Derry NH MNCHNHACAMD  6386 BELL ATLANTIC MOBILE, INC 122   2016-10-01   
603-260 8 Derry NH MNCHNHACAMD  6386 BELL ATLANTIC MOBILE, INC 122   2015-12-07   
603-260 9 Derry NH MNCHNHCOCM1  6889 OMNIPOINT MIAMI E LICENSE, LLC 122   2014-12-14   
603-261 A Merrimack NH MNCHNHCOX4Z  6290 UNITED STATES CELLULAR - NH 122      
603-261 0 Merrimack NH MNCHNHCOCM1  5562 METROPCS, INC. 122   2008-12-15   
603-261 1 Merrimack NH MNCHNHCOCM1  5562 METROPCS, INC. 122   2008-12-15   
603-261 2 Merrimack NH MNCHNHCOX8Z  4017 LEVEL 3 COMMUNICATIONS, LLC - NH 122   2010-09-27   
603-261 3 Merrimack NH MNCHNHIE6MD  318J COMCAST IP PHONE, LLC 122   2013-11-20   
603-261 4 Merrimack NH MNCHNHCOCM1  5562 METROPCS, INC. 122   2014-11-06   
603-261 5 Merrimack NH MNCHNHCOX4Z  6290 UNITED STATES CELLULAR - NH 122      
603-261 6 Merrimack NH MNCHNHCOX4Z  6290 UNITED STATES CELLULAR - NH 122      
603-261 7 Merrimack NH MNCHNHCOX4Z  6290 UNITED STATES CELLULAR - NH 122      
603-261 8 Merrimack NH MNCHNHCOX4Z  6290 UNITED STATES CELLULAR - NH 122      
603-261 9 Merrimack NH MNCHNHCOX4Z  6290 UNITED STATES CELLULAR - NH 122      
603-262 A Merrimack NH MRMCNHYADS1  5113 CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 122      
603-262 0 Merrimack NH MNCHNHCOCM1  5562 METROPCS, INC. 122   2008-12-15   
603-262 1 Merrimack NH MNCHNHCOX8Z  4017 LEVEL 3 COMMUNICATIONS, LLC - NH 122   2005-09-15   
603-262 2 Merrimack NH   829J PAETEC ITEL, LLC 122   2001-09-10   
603-262 3 Merrimack NH MNCHNHCOX8Z  4017 LEVEL 3 COMMUNICATIONS, LLC - NH 122   2004-09-04   
603-262 4 Merrimack NH MNCHNHCOX1Y  8299 TELEPORT COMMUNICATIONS AMERICA, LLC - NH 122   2004-04-11   
603-262 5 Merrimack NH MNCHNHIE6MD  318J COMCAST IP PHONE, LLC 122   2006-10-31   
603-262 6 Merrimack NH MRMCNHYADS1  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 >>

Last updated: Thu, 16 Oct 2025 03:04:18 UTC

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.