Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
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Washington Zone 4, MD

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NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
301-955 8   829J PAETEC ITEL, LLC 236   2010-11-12   
301-955 9 WASHDCINDS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236      
301-985 A HYVLMDHYDS0  9212 VERIZON MARYLAND, INC. 236      
301-985 0 HYVLMDHYDS0  9212 VERIZON MARYLAND, INC. 236      
301-985 1 HYVLMDHYDS0  9212 VERIZON MARYLAND, INC. 236      
301-985 2 WASHDCDP8MD  071F BANDWIDTH.COM CLEC, LLC - MD 236   2015-01-01   
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      

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Last updated: Thu, 05 Feb 2026 23:41:55 UTC

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