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: BLTMMDDN2MD

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NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
443-699 7 Annapolis MD 508J CENTURYLINK COMMUNICATIONS, LLC 238   2013-10-01   
443-770 7 Armiger-Gibson Island MD 508J CENTURYLINK COMMUNICATIONS, LLC 238   2014-06-25   
443-776 7 Elkridge MD 508J CENTURYLINK COMMUNICATIONS, LLC 238   2014-06-25   
443-787 7 Bel Air MD 508J CENTURYLINK COMMUNICATIONS, LLC 238   2014-04-02   
443-792 7 Brooklyn Park-Linthicum MD 508J CENTURYLINK COMMUNICATIONS, LLC 238   2014-04-03   
443-828 7 Ellicott City MD 508J CENTURYLINK COMMUNICATIONS, LLC 238   2014-06-25   
443-906 7 Severna Park MD 508J CENTURYLINK COMMUNICATIONS, LLC 238   2014-06-25   
443-914 6 Worthington MD 508J CENTURYLINK COMMUNICATIONS, LLC 238   2014-06-25   
443-917 7 Columbia MD 508J CENTURYLINK COMMUNICATIONS, LLC 238   2013-10-01   
443-936 6 Elkridge MD 508J CENTURYLINK COMMUNICATIONS, LLC 238   2018-10-18   
443-947 7 Perryville MD 508J CENTURYLINK COMMUNICATIONS, LLC 238   2014-06-12   
667-207 7 Baltimore MD 508J CENTURYLINK COMMUNICATIONS, LLC 238   2013-10-01   
667-231 7 Aberdeen MD 508J CENTURYLINK COMMUNICATIONS, LLC 236   2013-10-04   
667-308 7 Towson MD 508J CENTURYLINK COMMUNICATIONS, LLC 238   2013-10-01   
667-422 A Baltimore MD 508J CENTURYLINK COMMUNICATIONS, LLC 238      
667-422 0 Baltimore MD 508J CENTURYLINK COMMUNICATIONS, LLC 238   2023-02-21   
667-422 1 Baltimore MD 508J CENTURYLINK COMMUNICATIONS, LLC 238   2023-02-21   
667-422 2 Baltimore MD 508J CENTURYLINK COMMUNICATIONS, LLC 238   2023-02-21   
667-422 3 Baltimore MD 508J CENTURYLINK COMMUNICATIONS, LLC 238   2023-02-21   
667-422 4 Baltimore MD 508J CENTURYLINK COMMUNICATIONS, LLC 238   2023-02-21   
667-422 5 Baltimore MD 508J CENTURYLINK COMMUNICATIONS, LLC 238   2023-02-21   
667-422 6 Baltimore MD 508J CENTURYLINK COMMUNICATIONS, LLC 238   2023-02-21   
667-422 7 Baltimore MD 508J CENTURYLINK COMMUNICATIONS, LLC 238   2023-02-21   
667-422 8 Baltimore MD 508J CENTURYLINK COMMUNICATIONS, LLC 238   2023-02-21   
667-422 9 Baltimore MD 508J CENTURYLINK COMMUNICATIONS, LLC 238   2023-02-21   

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Last updated: Fri, 10 Jul 2026 02:55:48 UTC

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