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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
443-296 3 Waterloo MD   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2006-01-02   
443-296 5 Waterloo MD   876D ONVOY, LLC - MD 238   2012-10-08   
443-296 6 Waterloo MD   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238   2009-07-11   
443-296 7 Waterloo MD   318J COMCAST IP PHONE, LLC 238   2005-03-10   
443-296 8 Waterloo MD   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238   2005-08-14   
443-296 9 Waterloo MD   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238   2005-08-14   
443-297 A Arbutus MD BLTMMDFMDS0  7325 TELEPORT COMMUNICATIONS AMERICA, LLC - MD 238      
443-297 0 Arbutus MD   2593 CORE COMMUNICATIONS, INC.- MD 238   2004-03-29   
443-297 1 Arbutus MD   829J PAETEC ITEL, LLC 238   2012-05-14   
443-297 2 Arbutus MD   5562 METROPCS, INC. 238   2013-08-12   
443-297 3 Arbutus MD   7325 TELEPORT COMMUNICATIONS AMERICA, LLC - MD 238      
443-297 4 Arbutus MD   5562 METROPCS, INC. 238   2013-08-12   
443-297 5 Arbutus MD   4492 VDL, INC. DBA GLOBAL TELECOM BROKERS - MD 238   2004-02-14   
443-297 6 Arbutus MD   508J CENTURYLINK COMMUNICATIONS, LLC 238   2014-06-25   
443-297 7 Arbutus MD   071F BANDWIDTH.COM CLEC, LLC - MD 238   2010-09-04   
443-297 8 Arbutus MD   318J COMCAST IP PHONE, LLC 238   2002-01-09   
443-297 9 Arbutus MD   071F BANDWIDTH.COM CLEC, LLC - MD 238   2008-12-11   
443-298 A Easton MD SLBRMDSCXLX  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 242      
443-298 0 Easton MD   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 242   2003-01-06   
443-298 1 Easton MD   5562 METROPCS, INC. 242   2004-12-27   
443-298 2 Easton MD   876D ONVOY, LLC - MD 242   2024-07-15   
443-298 3 Easton MD   2593 CORE COMMUNICATIONS, INC.- MD 242   2018-10-22   
443-298 4 Easton MD   145J TERRA NOVA TELECOM INC. 242   2024-09-12   
443-298 5 Easton MD   145J TERRA NOVA TELECOM INC. 242   2025-05-07   
443-298 7 Easton MD   145J TERRA NOVA TELECOM INC. 242   2026-01-04   
443-298 8 Easton MD   145J TERRA NOVA TELECOM INC. 242   2024-02-15   
443-298 9 Easton MD   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 242   2016-08-06   
443-299 A Fallston MD   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238      
443-299 0 Fallston MD   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2025-06-25   
443-299 1 Fallston MD   876D ONVOY, LLC - MD 238   2025-10-12   
443-299 2 Fallston MD   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2004-11-04   
443-299 3 Fallston MD   145J TERRA NOVA TELECOM INC. 238   2021-01-27   
443-299 4 Fallston MD   145J TERRA NOVA TELECOM INC. 238   2025-05-16   
443-299 5 Fallston MD   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2024-07-07   
443-299 6 Fallston MD   318J COMCAST IP PHONE, LLC 238   2005-03-10   
443-299 7 Fallston MD   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2005-01-02   
443-299 8 Fallston MD   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2005-01-02   
443-299 9 Fallston MD   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2005-01-02   
443-300 A Sykesville MD BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238      
443-300 0 Sykesville MD   876D ONVOY, LLC - MD 238   2021-07-12   
443-300 1 Sykesville MD   876D ONVOY, LLC - MD 238   2021-04-29   
443-300 2 Sykesville MD   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238      
443-300 3 Sykesville MD   7228 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 238   2008-10-01   
443-300 4 Sykesville MD   624H ONVOY SPECTRUM, LLC 238   2021-06-26   
443-300 6 Sykesville MD   071F BANDWIDTH.COM CLEC, LLC - MD 238   2010-02-25   
443-300 7 Sykesville MD   071F BANDWIDTH.COM CLEC, LLC - MD 238   2010-09-03   
443-300 8 Sykesville MD   071F BANDWIDTH.COM CLEC, LLC - MD 238   2010-10-28   
443-300 9 Sykesville MD   876D ONVOY, LLC - MD 238   2021-07-12   
443-301 A Baltimore MD CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238      
443-301 0 Baltimore MD   7325 TELEPORT COMMUNICATIONS AMERICA, LLC - MD 238   2013-10-01   

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

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