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: ARBTMDARDS0

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NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
410-646 6 Baltimore MD 9212 VERIZON MARYLAND, INC. 238      
410-646 7 Baltimore MD 9212 VERIZON MARYLAND, INC. 238      
410-737 A Arbutus MD 9212 VERIZON MARYLAND, INC. 238      
410-906 A Baltimore MD 9212 VERIZON MARYLAND, INC. 238      
443-543 A Arbutus MD 9212 VERIZON MARYLAND, INC. 238      
443-543 0 Arbutus MD 9212 VERIZON MARYLAND, INC. 238      
443-543 1 Arbutus MD 9212 VERIZON MARYLAND, INC. 238      
443-543 2 Arbutus MD 9212 VERIZON MARYLAND, INC. 238      
443-543 3 Arbutus MD 9212 VERIZON MARYLAND, INC. 238      
443-543 5 Arbutus MD 9212 VERIZON MARYLAND, INC. 238      

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Last updated: Tue, 16 Jun 2026 00:09:45 UTC

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