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: MRKKMDMKDS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
240-264 A Laurel MD 9212 VERIZON MARYLAND, INC. 236      
240-583 A Laurel MD 9212 VERIZON MARYLAND, INC. 236      
301-210 A Laurel MD 9212 VERIZON MARYLAND, INC. 236      
301-419 A Washington Zone 13 MD 9212 VERIZON MARYLAND, INC. 236      
301-425 A Washington Zone 13 MD 9212 VERIZON MARYLAND, INC. 236      
301-426 A Washington Zone 13 MD 9212 VERIZON MARYLAND, INC. 236      
301-566 A Washington Zone 13 MD 9212 VERIZON MARYLAND, INC. 236      
301-716 A Washington Zone 13 MD 9212 VERIZON MARYLAND, INC. 236      
410-606 A Waterloo (Washington DC LATA) MD 9212 VERIZON MARYLAND, INC. 236      
410-722 A Waterloo (Washington DC LATA) MD 9212 VERIZON MARYLAND, INC. 236      
410-738 A Waterloo (Washington DC LATA) MD 9212 VERIZON MARYLAND, INC. 236      
410-791 A Waterloo (Washington DC LATA) MD 9212 VERIZON MARYLAND, INC. 236      
410-813 A Waterloo (Washington DC LATA) MD 9212 VERIZON MARYLAND, INC. 236      
410-815 A Waterloo (Washington DC LATA) MD 9212 VERIZON MARYLAND, INC. 236      
410-898 A Waterloo (Washington DC LATA) MD 9212 VERIZON MARYLAND, INC. 236      

Last updated: Thu, 29 Jan 2026 14:35:03 UTC

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