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.
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Switch: BLTMMDCHAMD

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
410-306 9 Aberdeen MD 1958 ATX TELECOMMUNICATIONS SERVICES, LTD. 236   2003-02-25   
410-314 5 Arbutus MD 1958 ATX TELECOMMUNICATIONS SERVICES, LTD. 238   2004-03-27   
410-319 0 Baltimore MD 1958 ATX TELECOMMUNICATIONS SERVICES, LTD. 238   2004-02-15   
410-343 8 Sparks-Glencoe MD 1958 ATX TELECOMMUNICATIONS SERVICES, LTD. 238   2006-01-31   
410-344 8 Chase MD 1958 ATX TELECOMMUNICATIONS SERVICES, LTD. 238   2003-02-25   
410-399 3 Bel Air MD 1958 ATX TELECOMMUNICATIONS SERVICES, LTD. 238   2003-03-11   
410-406 8 Essex MD 1958 ATX TELECOMMUNICATIONS SERVICES, LTD. 238   2004-03-27   
410-414 6 Prince Frederick MD 1958 ATX TELECOMMUNICATIONS SERVICES, LTD. 238   2004-03-27   
410-441 2 Elkton MD 1958 ATX TELECOMMUNICATIONS SERVICES, LTD. 238   2003-02-26   
410-452 1 Cardiff MD 1958 ATX TELECOMMUNICATIONS SERVICES, LTD. 238   2003-02-25   
410-457 1 Darlington MD 1958 ATX TELECOMMUNICATIONS SERVICES, LTD. 238   2003-02-25   
410-489 8 Glenwood MD 1958 ATX TELECOMMUNICATIONS SERVICES, LTD. 238   2003-02-26   
410-505 9 Ellicott City MD 1958 ATX TELECOMMUNICATIONS SERVICES, LTD. 238   2004-03-27   
410-513 8 Parkville MD 1958 ATX TELECOMMUNICATIONS SERVICES, LTD. 238   2004-03-27   
410-514 0 Severn MD 1958 ATX TELECOMMUNICATIONS SERVICES, LTD. 238   2003-02-27   
410-609 8 Brooklyn Park-Linthicum MD 1958 ATX TELECOMMUNICATIONS SERVICES, LTD. 238   2003-02-25   
410-616 8 Towson MD 1958 ATX TELECOMMUNICATIONS SERVICES, LTD. 238   2003-02-27   
410-691 8 Glen Burnie MD 1958 ATX TELECOMMUNICATIONS SERVICES, LTD. 238   2003-02-26   
410-697 8 Millersville MD 1958 ATX TELECOMMUNICATIONS SERVICES, LTD. 238   2006-04-03   
410-698 0 Fork MD 1958 ATX TELECOMMUNICATIONS SERVICES, LTD. 238   2003-02-26   
410-753 8 Pikesville MD 1958 ATX TELECOMMUNICATIONS SERVICES, LTD. 238   2003-02-27   
410-774 8 Crofton MD 2217 ATX TELECOMMUNICATIONS SERVICES, LTD-MD 238   2003-02-25   
410-782 4 Elkridge MD 1958 ATX TELECOMMUNICATIONS SERVICES, LTD. 238   2003-02-25   
410-793 8 Severna Park MD 1958 ATX TELECOMMUNICATIONS SERVICES, LTD. 238   2003-02-27   
410-861 4 Westminster MD 1958 ATX TELECOMMUNICATIONS SERVICES, LTD. 238   2006-05-12   
410-874 2 Odenton MD 1958 ATX TELECOMMUNICATIONS SERVICES, LTD. 238   2006-06-30   
410-875 8 Sykesville MD 1958 ATX TELECOMMUNICATIONS SERVICES, LTD. 238   2004-03-27   
410-878 9 Baltimore MD 1958 ATX TELECOMMUNICATIONS SERVICES, LTD. 238   2006-08-07   
410-907 8 Woodlawn MD 1958 ATX TELECOMMUNICATIONS SERVICES, LTD. 238   2006-03-25   
410-942 2 Havre de Grace MD 1958 ATX TELECOMMUNICATIONS SERVICES, LTD. 238   2004-03-27   
443-259 9 Columbia MD 1958 ATX TELECOMMUNICATIONS SERVICES, LTD. 238   2003-02-25   
443-341 8 Catonsville MD 1958 ATX TELECOMMUNICATIONS SERVICES, LTD. 238   2004-03-27   

Last updated: Fri, 10 Sep 2021 12:38:21 UTC

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