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: FTWSMDCPRP0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
301-203 A Washington Zone 6 MD 9212 VERIZON MARYLAND, INC. 236      
301-292 A Washington Zone 6 MD 9212 VERIZON MARYLAND, INC. 236      

Last updated: Sat, 05 Apr 2025 03:03:23 UTC

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