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: COTNMDCRDS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
301-261 A Washington Zone 14 (Baltimore LATA) MD 9212 VERIZON MARYLAND, INC. 238      
301-858 A Washington Zone 14 (Baltimore LATA) MD 9212 VERIZON MARYLAND, INC. 238      
410-451 A Crofton MD 9212 VERIZON MARYLAND, INC. 238      
410-721 A Crofton MD 9212 VERIZON MARYLAND, INC. 238      
410-774 7 Crofton MD 9212 VERIZON MARYLAND, INC. 238   2005-10-15   
410-793 A Severna Park MD 9212 VERIZON MARYLAND, INC. 238      
410-793 0 Severna Park MD 9212 VERIZON MARYLAND, INC. 238      

Last updated: Thu, 16 Oct 2025 03:04:18 UTC

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