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: BLTMMDSN5MD

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
443-400 A Brooklyn Park-Linthicum MD 4773 XO MARYLAND, LLC 238      
443-408 A Sparrows Point MD 4773 XO MARYLAND, LLC 238      
443-430 A Columbia MD 4773 XO MARYLAND, LLC 238      
443-433 A Annapolis MD 4773 XO MARYLAND, LLC 238      
443-503 A Dundalk MD 4773 XO MARYLAND, LLC 238      
443-558 A Aberdeen MD 4773 XO MARYLAND, LLC 236      
443-637 A Armiger-Gibson Island MD 4773 XO MARYLAND, LLC 238      
443-701 A Arbutus MD 4773 XO MARYLAND, LLC 238      
443-703 A Baltimore MD 4773 XO MARYLAND, LLC 238      
443-710 A Catonsville MD 4773 XO MARYLAND, LLC 238      
443-793 A Parkville MD 4773 XO MARYLAND, LLC 238      
443-795 A Severn MD 4773 XO MARYLAND, LLC 238      
443-796 A Pikesville MD 4773 XO MARYLAND, LLC 238      
443-797 A Towson MD 4773 XO MARYLAND, LLC 238      
443-815 A Essex MD 4773 XO MARYLAND, LLC 238      
443-891 A Glen Burnie MD 4773 XO MARYLAND, LLC 238      
443-893 A Woodlawn MD 4773 XO MARYLAND, LLC 238      
443-973 A Ellicott City MD 4773 XO MARYLAND, LLC 238      

Last updated: Sun, 10 Nov 2019 13:49:34 UTC

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