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.
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Switch: CLMAMDSRRS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
410-312 A Columbia MD 9212 VERIZON MARYLAND, INC. 238      
410-872 A Columbia MD 9212 VERIZON MARYLAND, INC. 238      
410-953 A Columbia MD 9212 VERIZON MARYLAND, INC. 238      
443-285 A Columbia MD 9212 VERIZON MARYLAND, INC. 238      

Last updated: Sun, 31 May 2020 11:59:01 UTC

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