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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
443-583 9 Columbia MD   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2014-11-08   
443-584 A Crofton MD   829J PAETEC ITEL, LLC 238   2025-04-01   
443-584 0 Crofton MD   624H ONVOY SPECTRUM, LLC 238   2021-05-22   
443-584 1 Crofton MD   829J PAETEC ITEL, LLC 238      
443-584 2 Crofton MD   145J TERRA NOVA TELECOM INC. 238   2024-02-15   
443-584 3 Crofton MD   071F BANDWIDTH.COM CLEC, LLC - MD 238   2014-06-06   
443-584 4 Crofton MD   318J COMCAST IP PHONE, LLC 238   2014-07-20   
443-584 5 Crofton MD   071F BANDWIDTH.COM CLEC, LLC - MD 238   2015-05-21   
443-584 6 Crofton MD   071F BANDWIDTH.COM CLEC, LLC - MD 238   2015-05-21   
443-584 7 Crofton MD   508J CENTURYLINK COMMUNICATIONS, LLC 238   2014-06-25   
443-584 8 Crofton MD   515J IP HORIZON LLC 238   2016-10-14   
443-584 9 Crofton MD   515J IP HORIZON LLC 238   2015-03-21   
443-585 A Darlington MD   829J PAETEC ITEL, LLC 238   2025-04-01   
443-585 0 Darlington MD   071F BANDWIDTH.COM CLEC, LLC - MD 238   2015-05-21   
443-585 1 Darlington MD   829J PAETEC ITEL, LLC 238      
443-585 2 Darlington MD   071F BANDWIDTH.COM CLEC, LLC - MD 238   2015-05-21   
443-585 3 Darlington MD   876D ONVOY, LLC - MD 238   2016-04-10   
443-585 4 Darlington MD   876D ONVOY, LLC - MD 238   2016-04-10   
443-585 5 Darlington MD   8697 BALTIMORE-WASHINGTON TELEPHONE (BWT) 238   2015-06-11   
443-585 6 Darlington MD   073H TELNYX LLC 238   2017-04-26   
443-585 7 Darlington MD   508J CENTURYLINK COMMUNICATIONS, LLC 238   2014-06-12   
443-585 8 Darlington MD   876D ONVOY, LLC - MD 238   2014-09-19   
443-585 9 Darlington MD   876D ONVOY, LLC - MD 238   2014-09-19   
443-586 A Dundalk MD BLTMMD91GT0  2593 CORE COMMUNICATIONS, INC.- MD 238      
443-586 0 Dundalk MD   876D ONVOY, LLC - MD 238   2024-02-29   
443-586 1 Dundalk MD   876D ONVOY, LLC - MD 238   2024-02-29   
443-586 2 Dundalk MD   2593 CORE COMMUNICATIONS, INC.- MD 238   2018-10-22   
443-586 3 Dundalk MD   2593 CORE COMMUNICATIONS, INC.- MD 238   2018-10-22   
443-586 4 Dundalk MD   2593 CORE COMMUNICATIONS, INC.- MD 238   2018-10-22   
443-586 5 Dundalk MD   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2017-11-24   
443-586 6 Dundalk MD   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2017-11-24   
443-586 7 Dundalk MD   876D ONVOY, LLC - MD 238   2024-02-29   
443-586 8 Dundalk MD   876D ONVOY, LLC - MD 238   2024-07-27   
443-586 9 Dundalk MD   876D ONVOY, LLC - MD 238   2024-09-15   
443-587 A Edgewood MD   829J PAETEC ITEL, LLC 238   2025-04-01   
443-587 0 Edgewood MD   2593 CORE COMMUNICATIONS, INC.- MD 238   2019-04-30   
443-587 1 Edgewood MD   829J PAETEC ITEL, LLC 238      
443-587 2 Edgewood MD   2593 CORE COMMUNICATIONS, INC.- MD 238   2019-04-30   
443-587 3 Edgewood MD   145J TERRA NOVA TELECOM INC. 238   2026-01-04   
443-587 4 Edgewood MD   318J COMCAST IP PHONE, LLC 238   2016-06-17   
443-587 5 Edgewood MD   145J TERRA NOVA TELECOM INC. 238   2024-02-15   
443-587 7 Edgewood MD   318J COMCAST IP PHONE, LLC 238   2016-06-21   
443-587 8 Edgewood MD   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2019-03-31   
443-587 9 Edgewood MD   2593 CORE COMMUNICATIONS, INC.- MD 238   2019-04-30   
443-588 A Parkville MD BLTMMDCHXNX  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238      
443-588 0 Parkville MD   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238      
443-588 1 Parkville MD   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238      
443-588 2 Parkville MD   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238      
443-588 3 Parkville MD   829J PAETEC ITEL, LLC 238   2015-09-04   
443-588 4 Parkville MD   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238      
443-588 5 Parkville MD   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238      
443-588 6 Parkville MD   2593 CORE COMMUNICATIONS, INC.- MD 238   2019-05-01   
443-588 7 Parkville MD   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238      
443-588 8 Parkville MD   318J COMCAST IP PHONE, LLC 238   2015-04-13   
443-588 9 Parkville MD   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238      
443-589 A Cockeysville MD   829J PAETEC ITEL, LLC 238   2025-04-01   
443-589 0 Cockeysville MD   829J PAETEC ITEL, LLC 238      
443-589 1 Cockeysville MD   829J PAETEC ITEL, LLC 238      
443-589 2 Cockeysville MD   829J PAETEC ITEL, LLC 238      
443-589 3 Cockeysville MD   829J PAETEC ITEL, LLC 238      
443-589 4 Cockeysville MD   5562 METROPCS, INC. 238   2013-06-14   
443-589 5 Cockeysville MD   071F BANDWIDTH.COM CLEC, LLC - MD 238   2018-10-19   
443-589 6 Cockeysville MD   876D ONVOY, LLC - MD 238   2024-07-15   
443-589 7 Cockeysville MD   876D ONVOY, LLC - MD 238   2016-03-14   
443-589 8 Cockeysville MD   876D ONVOY, LLC - MD 238   2016-03-14   
443-589 9 Cockeysville MD   829J PAETEC ITEL, LLC 238      
443-590 A Reisterstown MD   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238      
443-590 0 Reisterstown MD   876D ONVOY, LLC - MD 238   2024-12-14   
443-590 1 Reisterstown MD   876D ONVOY, LLC - MD 238   2025-06-13   
443-590 2 Reisterstown MD   624H ONVOY SPECTRUM, LLC 238   2021-09-10   
443-590 3 Reisterstown MD   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2006-01-02   
443-590 5 Reisterstown MD   7228 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 238   2008-10-01   
443-590 6 Reisterstown MD   5562 METROPCS, INC. 238   2016-12-14   
443-590 7 Reisterstown MD   876D ONVOY, LLC - MD 238   2016-03-21   
443-590 8 Reisterstown MD   964H BARR TELL USA, INC. 238   2016-12-17   
443-590 9 Reisterstown MD   876D ONVOY, LLC - MD 238   2016-03-21   
443-591 A Glen Burnie MD BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238      
443-591 0 Glen Burnie MD   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2009-07-06   
443-591 1 Glen Burnie MD   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2009-09-03   
443-591 2 Glen Burnie MD   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2010-01-13   
443-591 3 Glen Burnie MD   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2010-01-13   
443-591 4 Glen Burnie MD   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2010-02-16   
443-591 5 Glen Burnie MD   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2010-03-16   
443-591 6 Glen Burnie MD   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2010-06-03   
443-591 7 Glen Burnie MD   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2010-06-14   
443-591 8 Glen Burnie MD   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2010-06-14   
443-591 9 Glen Burnie MD   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2010-06-14   
443-592 A Elkridge MD BLTMMD91GT0  2593 CORE COMMUNICATIONS, INC.- MD 238      
443-592 0 Elkridge MD   624H ONVOY SPECTRUM, LLC 238   2022-03-18   
443-592 1 Elkridge MD   624H ONVOY SPECTRUM, LLC 238   2022-01-16   
443-592 2 Elkridge MD   624H ONVOY SPECTRUM, LLC 238   2022-03-18   
443-592 3 Elkridge MD   318J COMCAST IP PHONE, LLC 238   2017-04-18   
443-592 4 Elkridge MD   624H ONVOY SPECTRUM, LLC 238   2022-01-16   
443-592 5 Elkridge MD   2593 CORE COMMUNICATIONS, INC.- MD 238   2018-06-16   
443-592 6 Elkridge MD   2593 CORE COMMUNICATIONS, INC.- MD 238   2018-06-16   
443-592 7 Elkridge MD   2593 CORE COMMUNICATIONS, INC.- MD 238   2018-06-16   
443-592 8 Elkridge MD   515J IP HORIZON LLC 238   2019-04-26   
443-593 A Elkton MD   829J PAETEC ITEL, LLC 238   2025-04-01   
443-593 0 Elkton MD   515J IP HORIZON LLC 238   2016-01-04   
443-593 1 Elkton MD   829J PAETEC ITEL, LLC 238      

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Last updated: Thu, 01 Jan 2026 03:59:49 UTC

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