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: BLTOMDKHDS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
410-246 A Baltimore MD 7228 MCI WORLDCOM COMMUNICATIONS, INC. - MD 238      
410-487 A Glen Burnie MD 7228 MCI WORLDCOM COMMUNICATIONS, INC. - MD 238      
410-616 A Towson MD 7228 MCI WORLDCOM COMMUNICATIONS, INC. - MD 238      
410-622 A Baltimore MD 7228 MCI WORLDCOM COMMUNICATIONS, INC. - MD 238   2011-09-26   
410-645 A Woodlawn MD 7228 MCI WORLDCOM COMMUNICATIONS, INC. - MD 238      
410-753 A Pikesville MD 7228 MCI WORLDCOM COMMUNICATIONS, INC. - MD 238      
410-891 A Cockeysville MD 7228 MCI WORLDCOM COMMUNICATIONS, INC. - MD 238      
443-224 A Baltimore MD 7228 MCI WORLDCOM COMMUNICATIONS, INC. - MD 238      
443-261 A Severna Park MD 7228 MCI WORLDCOM COMMUNICATIONS, INC. - MD 238      
443-289 A Westminster MD 7228 MCI WORLDCOM COMMUNICATIONS, INC. - MD 238   2011-06-30   
443-475 A Baltimore MD 7228 MCI WORLDCOM COMMUNICATIONS, INC. - MD 238   2011-07-16   
443-741 A Columbia MD 7228 MCI WORLDCOM COMMUNICATIONS, INC. - MD 238   2011-05-13   
443-931 A Baltimore MD 7228 MCI WORLDCOM COMMUNICATIONS, INC. - MD 238   2011-12-08   

Last updated: Sun, 31 May 2020 11:59:01 UTC

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