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 8 9 10 11 12 13 >>

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
301-852 2 HYVLMDHYDS0  9212 VERIZON MARYLAND, INC. 236      
301-852 3 WASKDCFNAMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236   2011-04-14   
301-852 4 BTVLMD12CMA  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236   2008-10-12   
301-852 5 WASHDCDP8MD  071F BANDWIDTH.COM CLEC, LLC - MD 236   2010-06-26   
301-852 6 WASHDCDP8MD  071F BANDWIDTH.COM CLEC, LLC - MD 236   2010-06-26   
301-852 7 WASHDCDP8MD  071F BANDWIDTH.COM CLEC, LLC - MD 236   2010-06-26   
301-852 8 WASKDCFNAMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236   2011-02-19   
301-852 9 WASKDCFNAMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236   2011-02-19   
301-853 A HYVLMDCMDS0  9212 VERIZON MARYLAND, INC. 236      
301-864 A HYVLMDHYDS0  9212 VERIZON MARYLAND, INC. 236      
301-887 A HYVLMDHYDS0  9212 VERIZON MARYLAND, INC. 236      
301-887 0 HYVLMDHYDS0  9212 VERIZON MARYLAND, INC. 236      
301-887 1 HYVLMDHYDS0  9212 VERIZON MARYLAND, INC. 236      
301-887 2 WASKDCFNPS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236      
301-887 3 WASHDCDP8MD  071F BANDWIDTH.COM CLEC, LLC - MD 236   2011-05-20   
301-887 4 HYVLMDHYDS0  9212 VERIZON MARYLAND, INC. 236      
301-887 5 WASHDCDP8MD  071F BANDWIDTH.COM CLEC, LLC - MD 236   2011-05-20   
301-887 6 HYVLMDHYDS0  9212 VERIZON MARYLAND, INC. 236      
301-887 7 WASKDCFNAMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236   2012-06-16   
301-887 8 HYVLMDHYDS0  9212 VERIZON MARYLAND, INC. 236      
301-887 9 HYVLMDHYDS0  9212 VERIZON MARYLAND, INC. 236      
301-892 A HYVLMDHYPS0  9212 VERIZON MARYLAND, INC. 236      
301-892 0 WASKDCFNAMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236   2011-06-02   
301-892 1 WASKDCFNAMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236   2011-09-02   
301-892 2 WASKDCFNAMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236   2011-06-27   
301-892 3 WASHDCDP8MD  071F BANDWIDTH.COM CLEC, LLC - MD 236   2011-05-20   
301-892 4   829J PAETEC ITEL, LLC 236   2010-09-22   
301-892 5 WASHDCDP8MD  071F BANDWIDTH.COM CLEC, LLC - MD 236   2011-05-20   
301-892 6 WASHDCDP8MD  071F BANDWIDTH.COM CLEC, LLC - MD 236   2012-05-12   
301-892 7 WASLDCRGDS0  281E YMAX COMMUNICATIONS CORP. - MD 236   2010-09-01   
301-892 8 WASLDCRGDS0  281E YMAX COMMUNICATIONS CORP. - MD 236   2010-09-01   
301-892 9 HYVLMDHYPS0  9212 VERIZON MARYLAND, INC. 236   2005-05-02   
301-918 A LNHMMDLNDS0  9212 VERIZON MARYLAND, INC. 236      
301-918 0 LNHMMDLNDS0  9212 VERIZON MARYLAND, INC. 236      
301-918 1 LNHMMDLNDS0  9212 VERIZON MARYLAND, INC. 236      
301-918 2 LNHMMDLNDS0  9212 VERIZON MARYLAND, INC. 236      
301-918 3 LNHMMDLNDS0  9212 VERIZON MARYLAND, INC. 236      
301-918 4 LNHMMDLNDS0  9212 VERIZON MARYLAND, INC. 236      
301-918 5 VINNVACBDS0  876D ONVOY, LLC - MD 236   2014-10-24   
301-918 6 LNHMMDLNDS0  9212 VERIZON MARYLAND, INC. 236      
301-918 7 LNHMMDLNDS0  9212 VERIZON MARYLAND, INC. 236      
301-918 8 LNHMMDLNDS0  9212 VERIZON MARYLAND, INC. 236      
301-918 9 LNHMMDLNDS0  9212 VERIZON MARYLAND, INC. 236      
301-927 A HYVLMDHYDS0  9212 VERIZON MARYLAND, INC. 236      
301-954 A WDLWMDWLDS0  9212 VERIZON MARYLAND, INC. 236      
301-955 A WASHDCINDS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236      
301-955 0 WASHDCINDS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236      
301-955 1 WASHDCINDS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236      
301-955 2   829J PAETEC ITEL, LLC 236   2010-11-12   
301-955 3 WASHDCINDS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236      

<< 1 2 3 4 5 6 7 8 9 10 11 12 13 >>

Last updated: Sat, 02 May 2026 12:20:53 UTC

Sponsored by: VoIP Much Phone Company

Like this site? We accept donations via PayPal.