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: SLSPMDNWDS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
301-592 A Washington Zone 3 MD 9212 VERIZON MARYLAND, INC. 236      
301-593 A Washington Zone 3 MD 9212 VERIZON MARYLAND, INC. 236      
301-649 A Washington Zone 11 MD 9212 VERIZON MARYLAND, INC. 236      
301-681 A Washington Zone 3 MD 9212 VERIZON MARYLAND, INC. 236      
301-754 A Washington Zone 3 MD 9212 VERIZON MARYLAND, INC. 236      
301-905 A Washington Zone 3 MD 9212 VERIZON MARYLAND, INC. 236      

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

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