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: CLMAMDCBDS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
301-307 A Washington Zone 13 (Baltimore LATA) MD 9212 VERIZON MARYLAND, INC. 238      
301-596 A Laurel (Baltimore LATA) MD 9212 VERIZON MARYLAND, INC. 238      
410-715 A Columbia MD 9212 VERIZON MARYLAND, INC. 238      
410-720 A Ellicott City MD 9212 VERIZON MARYLAND, INC. 238      
410-730 A Columbia MD 9212 VERIZON MARYLAND, INC. 238      
410-740 A Columbia MD 9212 VERIZON MARYLAND, INC. 238      
410-772 A Columbia MD 9212 VERIZON MARYLAND, INC. 238      
410-884 A Columbia MD 9212 VERIZON MARYLAND, INC. 238      
410-964 A Columbia MD 9212 VERIZON MARYLAND, INC. 238      
410-992 A Columbia MD 9212 VERIZON MARYLAND, INC. 238      
410-995 A Ellicott City MD 9212 VERIZON MARYLAND, INC. 238      
410-997 A Columbia MD 9212 VERIZON MARYLAND, INC. 238      
443-367 A Columbia MD 9212 VERIZON MARYLAND, INC. 238      
443-518 A Columbia MD 9212 VERIZON MARYLAND, INC. 238   2009-03-02   
443-546 A Columbia MD 9212 VERIZON MARYLAND, INC. 238      

Last updated: Fri, 17 May 2019 00:49:52 UTC

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