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.
  • If you want to search an entire area code regardless of activity, leave both the next and past days fields set to zero.

Switch: BADNMDBNRS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
301-579 A Brandywine MD 9212 VERIZON MARYLAND, INC. 236      
301-579 2 Brandywine MD 9212 VERIZON MARYLAND, INC. 236      
301-579 6 Brandywine MD 9212 VERIZON MARYLAND, INC. 236      
301-579 9 Brandywine MD 9212 VERIZON MARYLAND, INC. 236      
301-888 A Washington Zone 16 MD 9212 VERIZON MARYLAND, INC. 236      
301-888 1 Washington Zone 16 MD 9212 VERIZON MARYLAND, INC. 236      
301-888 2 Washington Zone 16 MD 9212 VERIZON MARYLAND, INC. 236      
301-888 9 Washington Zone 16 MD 9212 VERIZON MARYLAND, INC. 236      

Last updated: Thu, 20 Nov 2025 13:34:34 UTC

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