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.

Switch: BLTQMD01BMD

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
443-264 A Pikesville MD 2593 CORE COMMUNICATIONS, INC.- MD 238      
443-269 A Towson MD 2593 CORE COMMUNICATIONS, INC.- MD 238      
443-337 A Sparrows Point MD 2593 CORE COMMUNICATIONS, INC.- MD 238      
443-346 A Severna Park MD 2593 CORE COMMUNICATIONS, INC.- MD 238      
443-431 A Randallstown MD 2593 CORE COMMUNICATIONS, INC.- MD 238      
443-628 A Glen Burnie MD 2593 CORE COMMUNICATIONS, INC.- MD 238      
443-946 A Parkville MD 2593 CORE COMMUNICATIONS, INC.- MD 238      
667-446 A Elkridge MD 516J TON80 COMMUNICATIONS, LLC 238      
667-464 A Baltimore MD 516J TON80 COMMUNICATIONS, LLC 238      
667-466 A Havre de Grace MD 516J TON80 COMMUNICATIONS, LLC 238      
667-622 A Pikesville MD 516J TON80 COMMUNICATIONS, LLC 238      
667-626 A Catonsville MD 516J TON80 COMMUNICATIONS, LLC 238      
667-646 A Annapolis MD 516J TON80 COMMUNICATIONS, LLC 238      
667-737 A Perryville MD 516J TON80 COMMUNICATIONS, LLC 238      
667-746 A Glenwood MD 516J TON80 COMMUNICATIONS, LLC 238      
667-824 A Edgewood MD 516J TON80 COMMUNICATIONS, LLC 238      
667-832 A Brooklyn Park-Linthicum MD 516J TON80 COMMUNICATIONS, LLC 238      
667-846 A Cockeysville MD 516J TON80 COMMUNICATIONS, LLC 238      
667-848 A Aberdeen MD 516J TON80 COMMUNICATIONS, LLC 236      
667-856 A Dundalk MD 516J TON80 COMMUNICATIONS, LLC 238      
667-925 A Bel Air MD 469J CORETEL MARYLAND, INC. - MD 238      
667-942 A Aberdeen MD 516J TON80 COMMUNICATIONS, LLC 236      

Last updated: Thu, 01 Jan 2026 03:59:49 UTC

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