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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
443-514 8 Catonsville MD   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2005-03-19   
443-514 9 Catonsville MD   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2021-06-06   
443-515 A Cambridge MD ESTNMDESQMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 242      
443-515 0 Cambridge MD   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 242   2009-08-07   
443-515 1 Cambridge MD   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 242   2010-08-21   
443-515 2 Cambridge MD   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 242   2011-08-25   
443-515 3 Cambridge MD   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 242   2011-08-25   
443-515 4 Cambridge MD   624H ONVOY SPECTRUM, LLC 242   2022-02-03   
443-515 5 Cambridge MD   829J PAETEC ITEL, LLC 242   2010-06-27   
443-515 6 Cambridge MD   7325 TELEPORT COMMUNICATIONS AMERICA, LLC - MD 242   2012-07-13   
443-515 7 Cambridge MD   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 242   2015-04-12   
443-515 8 Cambridge MD   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 242   2015-04-12   
443-515 9 Cambridge MD   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 242   2014-11-08   
443-516 A Sykesville MD   876D ONVOY, LLC - MD 238      
443-516 2 Sykesville MD   829J PAETEC ITEL, LLC 238   2004-12-22   
443-516 3 Sykesville MD   2593 CORE COMMUNICATIONS, INC.- MD 238   2019-05-01   
443-516 5 Sykesville MD   568G PEERLESS NETWORK OF MARYLAND, LLC 238   2024-03-22   
443-516 6 Sykesville MD   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2016-09-19   
443-516 7 Sykesville MD   071F BANDWIDTH.COM CLEC, LLC - MD 238   2011-06-02   
443-516 8 Sykesville MD   876D ONVOY, LLC - MD 238   2016-03-28   
443-516 9 Sykesville MD   876D ONVOY, LLC - MD 238   2016-03-28   
443-517 A Glen Burnie MD   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238      
443-517 0 Glen Burnie MD   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2025-05-06   
443-517 2 Glen Burnie MD   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2019-12-20   
443-517 3 Glen Burnie MD   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2006-04-01   
443-517 4 Glen Burnie MD   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2025-05-06   
443-517 5 Glen Burnie MD   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2008-05-05   
443-517 6 Glen Burnie MD   318J COMCAST IP PHONE, LLC 238   2005-03-10   
443-517 7 Glen Burnie MD   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2005-12-02   
443-517 8 Glen Burnie MD   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2008-04-21   
443-517 9 Glen Burnie MD   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2007-12-06   
443-518 A Columbia MD CLMAMDCBRP0  9212 VERIZON MARYLAND, INC. 238      
443-518 0 Columbia MD   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2009-05-26   
443-518 1 Columbia MD   9212 VERIZON MARYLAND, INC. 238   2009-03-02   
443-518 2 Columbia MD   9212 VERIZON MARYLAND, INC. 238   2009-03-02   
443-518 3 Columbia MD   9212 VERIZON MARYLAND, INC. 238   2009-03-02   
443-518 4 Columbia MD   9212 VERIZON MARYLAND, INC. 238   2009-03-02   
443-518 5 Columbia MD   9212 VERIZON MARYLAND, INC. 238   2009-03-02   
443-518 6 Columbia MD   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2009-05-26   
443-518 7 Columbia MD   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238   2010-04-08   
443-518 8 Columbia MD   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2010-03-29   
443-518 9 Columbia MD   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2009-06-23   
443-519 A Towson MD   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238      
443-519 0 Towson MD   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2024-12-17   
443-519 1 Towson MD   145J TERRA NOVA TELECOM INC. 238   2024-10-12   
443-519 2 Towson MD   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2004-12-28   
443-519 3 Towson MD   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2005-05-01   
443-519 4 Towson MD   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2025-11-19   
443-519 5 Towson MD   318J COMCAST IP PHONE, LLC 238   2008-04-30   
443-519 6 Towson MD   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2005-06-01   

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

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