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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
443-274 5 Severn MD   071F BANDWIDTH.COM CLEC, LLC - MD 238   2013-04-22   
443-274 6 Severn MD   829J PAETEC ITEL, LLC 238   2005-07-04   
443-274 7 Severn MD   071F BANDWIDTH.COM CLEC, LLC - MD 238   2013-04-22   
443-274 8 Severn MD   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2016-04-18   
443-274 9 Severn MD   9212 VERIZON MARYLAND, INC. 238      
443-275 A Towson MD BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238      
443-275 0 Towson MD   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2013-01-19   
443-275 1 Towson MD   318J COMCAST IP PHONE, LLC 238   2006-09-11   
443-275 2 Towson MD   318J COMCAST IP PHONE, LLC 238   2007-08-13   
443-275 3 Towson MD   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2005-06-01   
443-275 4 Towson MD   7228 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 238      
443-275 5 Towson MD   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2010-11-20   
443-275 6 Towson MD   7228 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 238   2012-10-27   
443-275 7 Towson MD   318J COMCAST IP PHONE, LLC 238   2012-09-26   
443-275 8 Towson MD   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2006-01-29   
443-275 9 Towson MD   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2008-02-13   
443-276 A Columbia MD BLTMMDCHXNX  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238      
443-276 0 Columbia MD   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238      
443-276 1 Columbia MD   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238      
443-276 2 Columbia MD   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238      
443-276 3 Columbia MD   4492 VDL, INC. DBA GLOBAL TELECOM BROKERS - MD 238   2003-11-08   
443-276 4 Columbia MD   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238      
443-276 5 Columbia MD   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238      
443-276 6 Columbia MD   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238      
443-276 7 Columbia MD   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238      
443-276 8 Columbia MD   2593 CORE COMMUNICATIONS, INC.- MD 238   2004-03-29   
443-276 9 Columbia MD   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238      
443-277 A Sykesville MD BLTMMDCH40Z  5562 METROPCS, INC. 238      
443-277 0 Sykesville MD   5562 METROPCS, INC. 238      
443-277 1 Sykesville MD   5562 METROPCS, INC. 238      
443-277 2 Sykesville MD   5562 METROPCS, INC. 238      
443-277 3 Sykesville MD   5562 METROPCS, INC. 238      
443-277 4 Sykesville MD   5562 METROPCS, INC. 238      
443-277 5 Sykesville MD   5562 METROPCS, INC. 238      
443-277 6 Sykesville MD   5562 METROPCS, INC. 238      
443-277 7 Sykesville MD   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238      
443-277 8 Sykesville MD   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238      
443-277 9 Sykesville MD   5562 METROPCS, INC. 238      
443-278 A Baltimore MD BLTMMDCH08Z  4492 VDL, INC. DBA GLOBAL TELECOM BROKERS - MD 238      
443-278 0 Baltimore MD   876D ONVOY, LLC - MD 238   2024-01-06   
443-278 1 Baltimore MD   876D ONVOY, LLC - MD 238   2024-01-06   
443-278 2 Baltimore MD   876D ONVOY, LLC - MD 238   2024-01-06   
443-278 3 Baltimore MD   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2004-12-03   
443-278 4 Baltimore MD   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2004-05-13   
443-278 5 Baltimore MD   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2004-05-13   
443-278 6 Baltimore MD   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2004-05-13   
443-278 7 Baltimore MD   829J PAETEC ITEL, LLC 238   2004-05-15   
443-278 8 Baltimore MD   829J PAETEC ITEL, LLC 238   2005-08-05   
443-278 9 Baltimore MD   4492 VDL, INC. DBA GLOBAL TELECOM BROKERS - MD 238   2003-11-23   
443-279 A Towson MD BLTMMDCHXNX  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238      

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

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