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 2, MD

<< 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 >>

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
301-652 A CHCHMDBEDS0  9212 VERIZON MARYLAND, INC. 236      
301-654 A CHCHMDBEDS0  9212 VERIZON MARYLAND, INC. 236      
301-655 A BTVLMD18GT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236      
301-656 A CHCHMDBEDS0  9212 VERIZON MARYLAND, INC. 236      
301-657 A CHCHMDBEDS0  9212 VERIZON MARYLAND, INC. 236      
301-661 A BTVLMD18GT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236      
301-664 A CHCHMDBEDS0  9212 VERIZON MARYLAND, INC. 236      
301-664 0   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236   2018-10-14   
301-664 1   073H TELNYX LLC 236   2017-03-14   
301-664 2   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 236   2019-06-06   
301-664 3   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236   2017-08-06   
301-664 4   071F BANDWIDTH.COM CLEC, LLC - MD 236   2018-10-19   
301-664 5   9212 VERIZON MARYLAND, INC. 236      
301-664 6   9212 VERIZON MARYLAND, INC. 236      
301-664 7   9212 VERIZON MARYLAND, INC. 236      
301-664 8   9212 VERIZON MARYLAND, INC. 236      
301-664 9   9212 VERIZON MARYLAND, INC. 236      
301-674 A BTVLMD12CMA  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236      
301-674 0   5562 METROPCS, INC. 236      
301-674 1   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236      
301-674 2   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236      
301-674 3   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236      
301-674 4   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236      
301-674 5   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236      
301-674 6   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236      
301-674 7   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236      
301-674 8   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236      
301-674 9   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236      
301-718 A CHCHMDBEDS0  9212 VERIZON MARYLAND, INC. 236      
301-742 A BTVLMD18GT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236      
301-760 A MCLNVA23DS4  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 236      
301-760 0   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236   2005-12-23   
301-760 1   9212 VERIZON MARYLAND, INC. 236   2004-07-08   
301-760 2   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 236   2007-07-03   
301-760 3   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 236   2005-02-14   
301-760 4   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 236      
301-760 5   9212 VERIZON MARYLAND, INC. 236   2004-08-10   
301-760 6   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236   2005-12-23   
301-760 7   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 236   2005-02-14   
301-760 8   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236   2005-09-13   
301-760 9   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236   2005-09-13   
301-767 A BTHSMDBDDS0  9212 VERIZON MARYLAND, INC. 236      
301-767 0   9212 VERIZON MARYLAND, INC. 236      
301-767 1   9212 VERIZON MARYLAND, INC. 236      
301-767 2   9212 VERIZON MARYLAND, INC. 236      
301-767 3   9212 VERIZON MARYLAND, INC. 236      
301-767 4   9212 VERIZON MARYLAND, INC. 236      
301-767 5   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236   2007-01-13   
301-767 6   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236   2007-04-09   
301-767 7   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236   2007-04-09   

<< 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 >>

Last updated: Thu, 29 Jan 2026 14:35:03 UTC

Sponsored by: LES.NET

Like this site? We accept donations via PayPal.