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.

Washington Zone 4, MD

<< 1 2 3 4 5 6 7

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
301-985 3 HYVLMDHYDS0  9212 VERIZON MARYLAND, INC. 236      
301-985 4 HYVLMDHYDS0  9212 VERIZON MARYLAND, INC. 236      
301-985 5 HYVLMDHYDS0  9212 VERIZON MARYLAND, INC. 236      
301-985 6 HYVLMDHYDS0  9212 VERIZON MARYLAND, INC. 236      
301-985 7 HYVLMDHYDS0  9212 VERIZON MARYLAND, INC. 236      
301-985 8 HYVLMDHYDS0  9212 VERIZON MARYLAND, INC. 236      
301-985 9 HYVLMDHYDS0  9212 VERIZON MARYLAND, INC. 236      

<< 1 2 3 4 5 6 7

Last updated: Thu, 16 Oct 2025 03:04:18 UTC

Sponsored by: LES.NET

Like this site? We accept donations via PayPal.