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: OXHLMDOHDS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
301-521 A Washington Zone 6 MD 9212 VERIZON MARYLAND, INC. 236      
301-567 A Washington Zone 6 MD 9212 VERIZON MARYLAND, INC. 236      
301-686 A Washington Zone 6 MD 9212 VERIZON MARYLAND, INC. 236      
301-749 A Washington Zone 6 MD 9212 VERIZON MARYLAND, INC. 236      
301-839 A Washington Zone 6 MD 9212 VERIZON MARYLAND, INC. 236      

Last updated: Wed, 01 Apr 2020 02:09:16 UTC

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