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NPA: 443 [Rate centres in NPA 443] [Dial plan for NPA 443]

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NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
443-392 9 Baltimore MD BLTMMDFMDS0  7325 TELEPORT COMMUNICATIONS AMERICA, LLC - MD 238      
443-393 A Columbia MD BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238      
443-393 0 Columbia MD CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2025-01-08   
443-393 1 Columbia MD CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2025-01-08   
443-393 2 Columbia MD BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2005-09-10   
443-393 3 Columbia MD BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2005-09-10   
443-393 4 Columbia MD BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238      
443-393 5 Columbia MD BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238      
443-393 6 Columbia MD BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2006-05-08   
443-393 7 Columbia MD BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2011-04-03   
443-393 8 Columbia MD BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238      
443-393 9 Columbia MD BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238      
443-394 A Pikesville MD OWMLMDOMDS0  9212 VERIZON MARYLAND, INC. 238      
443-395 A Aberdeen MD ABRDMDABDS0  9212 VERIZON MARYLAND, INC. 236      
443-395 0 Aberdeen MD ABRDMDABDS0  9212 VERIZON MARYLAND, INC. 236   2009-10-11   
443-395 1 Aberdeen MD ABRDMDABDS0  9212 VERIZON MARYLAND, INC. 236   2009-10-11   
443-395 2 Aberdeen MD ABRDMDABDS0  9212 VERIZON MARYLAND, INC. 236   2009-10-11   
443-395 3 Aberdeen MD ABRDMDABDS0  9212 VERIZON MARYLAND, INC. 236   2009-10-11   
443-395 4 Aberdeen MD ABRDMDABDS0  9212 VERIZON MARYLAND, INC. 236   2009-10-11   
443-395 5 Aberdeen MD ABRDMDABDS0  9212 VERIZON MARYLAND, INC. 236   2009-10-11   
443-395 6 Aberdeen MD ABRDMDABDS0  9212 VERIZON MARYLAND, INC. 236   2009-10-11   
443-395 7 Aberdeen MD ABRDMDABDS0  9212 VERIZON MARYLAND, INC. 236   2009-10-11   
443-395 8 Aberdeen MD ABRDMDABDS0  9212 VERIZON MARYLAND, INC. 236   2009-10-11   
443-395 9 Aberdeen MD ABRDMDABDS0  9212 VERIZON MARYLAND, INC. 236   2009-10-11   
443-396 A Odenton MD BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238      
443-396 0 Odenton MD   145J TERRA NOVA TELECOM INC. 238   2024-10-12   
443-396 1 Odenton MD BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238      
443-396 2 Odenton MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2012-10-07   
443-396 3 Odenton MD BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2010-03-07   
443-396 5 Odenton MD BLTQMD01DS0  568G PEERLESS NETWORK OF MARYLAND, LLC 238   2020-10-28   
443-396 6 Odenton MD   515J IP HORIZON LLC 238   2017-07-07   
443-396 7 Odenton MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2018-05-27   
443-396 8 Odenton MD BLTMMDCHX7X  073H TELNYX LLC 238   2017-04-26   
443-396 9 Odenton MD BLTMMDCH40Z  5562 METROPCS, INC. 238   2020-04-02   
443-397 A Salisbury MD ESTNMDESQMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 242      
443-397 0 Salisbury MD ESTNMDESQMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 242   2009-06-06   
443-397 1 Salisbury MD ESTNMDESQMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 242   2010-03-13   
443-397 2 Salisbury MD ESTNMDESQMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 242   2009-09-03   
443-397 3 Salisbury MD ESTNMDESQMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 242   2009-10-02   
443-397 4 Salisbury MD ESTNMDESQMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 242   2009-10-14   
443-397 5 Salisbury MD ESTNMDESQMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 242   2009-10-14   
443-397 6 Salisbury MD ESTNMDESQMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 242   2010-01-16   
443-397 7 Salisbury MD ESTNMDESQMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 242   2009-08-01   
443-397 8 Salisbury MD ESTNMDESQMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 242   2010-02-16   
443-397 9 Salisbury MD SLBRMDSBXFX  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 242   2010-03-28   
443-398 A Sykesville MD BLTMMDCH40Z  5562 METROPCS, INC. 238      
443-398 0 Sykesville MD BLTMMDCH40Z  5562 METROPCS, INC. 238      
443-398 1 Sykesville MD BLTMMDCH40Z  5562 METROPCS, INC. 238      
443-398 2 Sykesville MD BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2011-02-26   
443-398 3 Sykesville MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2012-02-29   

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Last updated: Sat, 10 Oct 2026 15:24:20 UTC

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