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: BLTMMDDNDS2

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
410-369 A Baltimore MD 7591 LEVEL 3 TELECOM OF MARYLAND, LLC - MD 238      
410-565 A Arbutus MD 7591 LEVEL 3 TELECOM OF MARYLAND, LLC - MD 238      
410-589 A Brooklyn Park-Linthicum MD 7591 LEVEL 3 TELECOM OF MARYLAND, LLC - MD 238      
410-595 A Glen Burnie MD 7591 LEVEL 3 TELECOM OF MARYLAND, LLC - MD 238      
410-680 A Ellicott City MD 7591 LEVEL 3 TELECOM OF MARYLAND, LLC - MD 238      
410-717 A Elkridge MD 7591 LEVEL 3 TELECOM OF MARYLAND, LLC - MD 238      
410-794 A Columbia MD 7591 LEVEL 3 TELECOM OF MARYLAND, LLC - MD 238      
410-807 A Catonsville MD 7591 LEVEL 3 TELECOM OF MARYLAND, LLC - MD 238      
410-921 A Severn MD 7591 LEVEL 3 TELECOM OF MARYLAND, LLC - MD 238      
410-927 A Odenton MD 7591 LEVEL 3 TELECOM OF MARYLAND, LLC - MD 238      
443-290 A Parkville MD 7591 LEVEL 3 TELECOM OF MARYLAND, LLC - MD 238      
443-708 A Baltimore MD 7591 LEVEL 3 TELECOM OF MARYLAND, LLC - MD 238      
443-798 A Towson MD 7591 LEVEL 3 TELECOM OF MARYLAND, LLC - MD 238      
443-870 A Pikesville MD 7591 LEVEL 3 TELECOM OF MARYLAND, LLC - MD 238      

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

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