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: BLTMMDSNDS5

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
443-222 A Worthington MD 4773 XO MARYLAND, LLC 238      
443-284 A Waterloo MD 4773 XO MARYLAND, LLC 238      
443-335 A Brooklyn Park-Linthicum MD 4773 XO MARYLAND, LLC 238      
443-363 A Severn MD 4773 XO MARYLAND, LLC 238      
443-578 A Cockeysville MD 4773 XO MARYLAND, LLC 238      
443-581 A Chase MD 4773 XO MARYLAND, LLC 238      
443-586 A Dundalk MD 4773 XO MARYLAND, LLC 238      
443-596 A Essex MD 4773 XO MARYLAND, LLC 238      
443-705 A Cockeysville MD 4773 XO MARYLAND, LLC 238      
443-720 A Aberdeen MD 4773 XO MARYLAND, LLC 236      
443-779 A Aberdeen MD 4773 XO MARYLAND, LLC 236      
443-781 A Armiger-Gibson Island MD 4773 XO MARYLAND, LLC 238      
443-782 A Annapolis MD 4773 XO MARYLAND, LLC 238      
443-788 A Aberdeen MD 4773 XO MARYLAND, LLC 236      
443-836 A Baltimore MD 4773 XO MARYLAND, LLC 238      
667-231 A Aberdeen MD 4773 XO MARYLAND, LLC 236      

Last updated: Sun, 04 Apr 2021 19:28:27 UTC

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