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: CLMAMDJTBMD

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
240-842 6 Washington Zone 14 (Baltimore LATA) MD 2589 US LEC OF MARYLAND, INC. 238   2016-11-21   
410-291 6 Baltimore MD 2589 US LEC OF MARYLAND, INC. 238   2017-09-02   
410-537 9 Baltimore MD 2589 US LEC OF MARYLAND, INC. 238   2016-02-01   
443-213 7 Pikesville MD 2589 US LEC OF MARYLAND, INC. 238   2016-12-07   
443-259 5 Columbia MD 2589 US LEC OF MARYLAND, INC. 238   2013-09-05   
443-367 4 Columbia MD 2589 US LEC OF MARYLAND, INC. 238   2007-06-15   
443-537 2 Columbia MD 2589 US LEC OF MARYLAND, INC. 238   2011-03-11   
443-672 1 Parkton MD 2589 US LEC OF MARYLAND, INC. 238   2004-01-31   
443-718 A Columbia MD 2589 US LEC OF MARYLAND, INC. 238      
443-718 2 Columbia MD 2589 US LEC OF MARYLAND, INC. 238   2008-05-10   
443-718 3 Columbia MD 2589 US LEC OF MARYLAND, INC. 238   2008-05-10   
443-718 4 Columbia MD 2589 US LEC OF MARYLAND, INC. 238   2008-06-16   
443-718 5 Columbia MD 2589 US LEC OF MARYLAND, INC. 238   2008-06-16   
443-766 A Columbia MD 2589 US LEC OF MARYLAND, INC. 238      
443-766 1 Columbia MD 2589 US LEC OF MARYLAND, INC. 238   2005-07-09   
443-766 7 Columbia MD 2589 US LEC OF MARYLAND, INC. 238   2006-07-15   
443-832 1 Columbia MD 2589 US LEC OF MARYLAND, INC. 238   2009-10-26   
667-600 2 Baltimore MD 2589 US LEC OF MARYLAND, INC. 238   2016-07-28   
667-600 3 Baltimore MD 2589 US LEC OF MARYLAND, INC. 238   2016-07-28   
667-600 4 Baltimore MD 2589 US LEC OF MARYLAND, INC. 238   2016-07-28   

Last updated: Tue, 16 Apr 2024 01:38:01 UTC

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