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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
443-946 5 Parkville MD   2593 CORE COMMUNICATIONS, INC.- MD 238   2018-10-23   
443-946 6 Parkville MD CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2017-11-13   
443-946 7 Parkville MD CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2017-11-13   
443-946 8 Parkville MD   2593 CORE COMMUNICATIONS, INC.- MD 238   2018-10-23   
443-946 9 Parkville MD BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2017-10-27   
443-947 A Perryville MD   829J PAETEC ITEL, LLC 238   2025-04-01   
443-947 0 Perryville MD BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2018-01-17   
443-947 1 Perryville MD   829J PAETEC ITEL, LLC 238      
443-947 2 Perryville MD BLTQMD01DS0  568G PEERLESS NETWORK OF MARYLAND, LLC 238   2019-03-08   
443-947 3 Perryville MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2016-08-05   
443-947 4 Perryville MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2016-08-05   
443-947 5 Perryville MD BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2017-03-30   
443-947 6 Perryville MD BLTOMDKHDS0  7228 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 238   2019-10-01   
443-947 7 Perryville MD BLTMMDDN2MD  508J CENTURYLINK COMMUNICATIONS, LLC 238   2014-06-12   
443-947 8 Perryville MD BLTQMD018MD  145J TERRA NOVA TELECOM INC. 238   2024-02-15   
443-947 9 Perryville MD BLTMMDCHX7X  073H TELNYX LLC 238   2017-04-26   
443-948 A Baltimore MD BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2024-02-09   
443-948 0 Baltimore MD BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2011-10-06   
443-948 1 Baltimore MD BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2011-10-06   
443-948 2 Baltimore MD CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2024-12-31   
443-948 3 Baltimore MD BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2011-10-06   
443-948 4 Baltimore MD BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2011-10-06   
443-948 5 Baltimore MD BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238   2013-11-19   
443-948 6 Baltimore MD BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2012-12-07   
443-948 7 Baltimore MD   829J PAETEC ITEL, LLC 238   2014-03-10   
443-948 8 Baltimore MD BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2012-09-11   
443-948 9 Baltimore MD CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2024-12-31   
443-949 A Annapolis MD BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238      
443-949 0 Annapolis MD BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238   2006-08-13   
443-949 1 Annapolis MD BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2008-11-26   
443-949 2 Annapolis MD CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2011-03-10   
443-949 3 Annapolis MD BLTOMDKHDS0  7228 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 238   2008-10-01   
443-949 4 Annapolis MD CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2011-03-10   
443-949 5 Annapolis MD BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2009-02-02   
443-949 6 Annapolis MD CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2009-03-19   
443-949 7 Annapolis MD BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238   2006-11-25   
443-949 8 Annapolis MD BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238   2006-11-25   
443-949 9 Annapolis MD BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238   2006-11-25   
443-951 A Annapolis MD   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238      
443-951 0 Annapolis MD   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238      
443-951 1 Annapolis MD BLTQMD018MD  145J TERRA NOVA TELECOM INC. 238   2024-12-29   
443-951 2 Annapolis MD   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238      
443-951 3 Annapolis MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2014-10-25   
443-951 4 Annapolis MD BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238      
443-951 5 Annapolis MD BLTMMDSNDS6  281E YMAX COMMUNICATIONS CORP. - MD 238   2008-07-27   
443-951 6 Annapolis MD BLTMMDCHX7X  073H TELNYX LLC 238   2022-12-26   
443-951 7 Annapolis MD BLTMMDDNDS2  7591 LEVEL 3 TELECOM OF MARYLAND, LLC - MD 238   2014-11-12   
443-951 8 Annapolis MD BLTMMDSNDS6  281E YMAX COMMUNICATIONS CORP. - MD 238   2008-07-27   
443-951 9 Annapolis MD BLTMMDSNDS6  281E YMAX COMMUNICATIONS CORP. - MD 238   2007-08-20   
443-952 A Westminster MD BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238      

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Last updated: Thu, 05 Feb 2026 23:41:55 UTC

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