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 10, MD

<< 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 >>

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
301-545 6 RKVLMDRVDS1  9212 VERIZON MARYLAND, INC. 236      
301-545 7 RKVLMDRVDS1  9212 VERIZON MARYLAND, INC. 236      
301-545 8 RKVLMDRVDS1  9212 VERIZON MARYLAND, INC. 236      
301-545 9 RKVLMDRVDS1  9212 VERIZON MARYLAND, INC. 236      
301-548 A GTBGMDGBPS0  9212 VERIZON MARYLAND, INC. 236      
301-550 A BTVLMD18G00  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236      
301-550 0 WASKDCFNAMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236   2022-09-10   
301-550 1 WASKDCFNAMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236   2022-09-10   
301-550 2 VINNVACBDS0  876D ONVOY, LLC - MD 236   2022-10-15   
301-550 3 BTVLMD12CM9  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236   2022-10-17   
301-550 4 BTVLMD127MD  5562 METROPCS, INC. 236   2022-11-14   
301-550 5 BTVLMD18G00  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236   2022-09-09   
301-550 6 BTVLMD18G00  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236   2022-09-09   
301-550 7 BTVLMD18G00  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236   2022-09-09   
301-550 8 BTVLMD18G00  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236   2022-09-09   
301-550 9 BTVLMD18G00  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236   2022-09-09   
301-590 A GTBGMDGBPS0  9212 VERIZON MARYLAND, INC. 236      
301-590 0 GTBGMDGBPS0  9212 VERIZON MARYLAND, INC. 236      
301-590 1 GTBGMDGBPS0  9212 VERIZON MARYLAND, INC. 236      
301-590 2 GTBGMDGBPS0  9212 VERIZON MARYLAND, INC. 236      
301-590 3 GTBGMDGBPS0  9212 VERIZON MARYLAND, INC. 236      
301-590 4 GTBGMDGBPS0  9212 VERIZON MARYLAND, INC. 236      
301-590 5 BTVLMD12CM9  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236   2014-09-16   
301-590 6 GTBGMDGBPS0  9212 VERIZON MARYLAND, INC. 236      
301-590 7 GTBGMDGBPS0  9212 VERIZON MARYLAND, INC. 236      
301-590 8 GTBGMDGBPS0  9212 VERIZON MARYLAND, INC. 236      
301-590 9 GTBGMDGBPS0  9212 VERIZON MARYLAND, INC. 236      
301-601 A GMTWMDGNDS0  9212 VERIZON MARYLAND, INC. 236      
301-605 A PLVLMDPVRS2  9212 VERIZON MARYLAND, INC. 236      
301-605 0 BTVLMD12CM9  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236   2014-09-25   
301-605 1 CHCHMDBE6MD  4716 PAETEC COMMUNICATIONS, INC. - MD 236   2009-11-10   
301-605 2 BTVLMD12CM9  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236   2008-06-16   
301-605 3 BTVLMD12CM9  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236   2008-06-16   
301-605 4 BTVLMD12CM9  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236   2007-02-16   
301-605 5 BTVLMD12CM9  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236   2007-03-25   
301-605 6 PLVLMDPVRS2  9212 VERIZON MARYLAND, INC. 236      
301-605 7 ARTNVAARXDY  318J COMCAST IP PHONE, LLC 236   2007-05-02   
301-605 8 LARLMDCCDS0  4492 VDL, INC. DBA GLOBAL TELECOM BROKERS - MD 236   2004-04-06   
301-605 9 MCLNVA23DS4  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 236   2012-01-14   
301-610 A RKVLMDRVDS1  9212 VERIZON MARYLAND, INC. 236      
301-610 0 RKVLMDRVDS1  9212 VERIZON MARYLAND, INC. 236      
301-610 1 RKVLMDRVDS1  9212 VERIZON MARYLAND, INC. 236      
301-610 2 RKVLMDRVDS1  9212 VERIZON MARYLAND, INC. 236      
301-610 3 VINNVACBDS0  876D ONVOY, LLC - MD 236   2020-04-30   
301-610 4 RKVLMDRVDS1  9212 VERIZON MARYLAND, INC. 236      
301-610 5 RKVLMDRVDS1  9212 VERIZON MARYLAND, INC. 236      
301-610 6 RKVLMDRVDS1  9212 VERIZON MARYLAND, INC. 236      
301-610 7 RKVLMDRVDS1  9212 VERIZON MARYLAND, INC. 236      
301-610 8 RKVLMDRVDS1  9212 VERIZON MARYLAND, INC. 236      
301-610 9 RKVLMDRVDS1  9212 VERIZON MARYLAND, INC. 236      

<< 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 >>

Last updated: Tue, 16 Apr 2024 01:38:01 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.