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NPA: 443 [Rate centres in NPA 443] [Dial plan for NPA 443]

Block: A

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NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
443-503 A Dundalk MD BLTMMDCHXNX  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238      
443-504 A Fallston MD   829J PAETEC ITEL, LLC 238   2025-04-01   
443-505 A Essex MD   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238      
443-506 A Baltimore MD BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238      
443-507 A Hampstead MD BLTMMDFMDS0  7325 TELEPORT COMMUNICATIONS AMERICA, LLC - MD 238      
443-508 A Hampstead MD   829J PAETEC ITEL, LLC 238   2025-04-01   
443-509 A Baltimore MD BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238      
443-510 A Annapolis MD BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238      
443-512 A Edgewood MD WNRNMDWNRS1  9212 VERIZON MARYLAND, INC. 238      
443-513 A Berlin MD SLBRMDSCXLX  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 242      
443-514 A Catonsville MD   829J PAETEC ITEL, LLC 238   2025-04-01   
443-515 A Cambridge MD ESTNMDESQMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 242      
443-516 A Sykesville MD   876D ONVOY, LLC - MD 238      
443-517 A Glen Burnie MD   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238      
443-518 A Columbia MD CLMAMDCBRP0  9212 VERIZON MARYLAND, INC. 238      
443-519 A Towson MD   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238      
443-520 A Catonsville MD CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238      
443-521 A Cambridge MD ESTNMDESQMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 242      
443-522 A Reisterstown MD   829J PAETEC ITEL, LLC 238   2025-04-01   
443-523 A Salisbury MD SLBRMDSBDS1  9212 VERIZON MARYLAND, INC. 242      
443-524 A Baltimore MD BLTMMDCHXNX  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238      
443-525 A Baltimore MD CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238      
443-526 A Havre de Grace MD   829J PAETEC ITEL, LLC 238   2025-04-01   
443-527 A Baltimore MD BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238      
443-528 A Bel Air MD BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238      
443-529 A Baltimore MD BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238      
443-530 A Dundalk MD   829J PAETEC ITEL, LLC 238   2025-04-01   
443-531 A Baltimore MD CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238      
443-532 A Prince Frederick MD BLTMMDCH40Z  5562 METROPCS, INC. 238      
443-533 A Jarrettsville MD BLTMMDFMDS0  7325 TELEPORT COMMUNICATIONS AMERICA, LLC - MD 238      
443-534 A Annapolis MD BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238      
443-535 A Columbia MD CLVLMDCERP0  9212 VERIZON MARYLAND, INC. 238   2024-01-30   
443-536 A Westminster MD BLTMMDCH40Z  5562 METROPCS, INC. 238      
443-537 A Columbia MD BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238      
443-538 A Columbia MD BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238      
443-539 A Columbia MD   829J PAETEC ITEL, LLC 238   2025-04-01   
443-540 A Baltimore MD CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238      
443-541 A Cockeysville MD   829J PAETEC ITEL, LLC 238   2025-04-01   
443-542 A Columbia MD BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238      
443-543 A Arbutus MD ARBTMDARDS0  9212 VERIZON MARYLAND, INC. 238      
443-544 A Pikesville MD   829J PAETEC ITEL, LLC 238   2025-04-01   
443-545 A Columbia MD BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238      
443-546 A Columbia MD CLMAMDCBRP0  9212 VERIZON MARYLAND, INC. 238      
443-547 A Westminster MD BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238      
443-548 A Pikesville MD BLTMMDCHXNX  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238      
443-549 A Dundalk MD   829J PAETEC ITEL, LLC 238   2025-04-01   
443-550 A North Beach MD BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238      
443-551 A Woodlawn MD BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238      
443-552 A Baltimore MD BLTMMDMDDS0  9212 VERIZON MARYLAND, INC. 238      
443-553 A Elkton MD BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238      
443-554 A Chase MD BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238      
443-556 A Cockeysville MD CYVLMDDADS0  9212 VERIZON MARYLAND, INC. 238      
443-557 A Glen Burnie MD BLTMMDCHXNX  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238      
443-558 A Aberdeen MD BLTMMDCHXNX  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236      
443-559 A Essex MD BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238      
443-560 A Baltimore MD BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2024-02-09   
443-561 A Elkridge MD   829J PAETEC ITEL, LLC 238   2025-04-01   
443-562 A Baltimore MD CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238      
443-563 A Baltimore MD BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238      
443-564 A Towson MD BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238      
443-565 A Randallstown MD   829J PAETEC ITEL, LLC 238   2025-04-01   
443-566 A Chesapeake City MD ESTNMDESQMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 242      
443-567 A Bel Air MD BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238      
443-568 A Arbutus MD BLTMMDCHXNX  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238      
443-569 A Annapolis MD BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238      
443-570 A Baltimore MD BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238      
443-571 A Baltimore MD BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238      
443-572 A Glen Burnie MD GLBRMDGLRP0  9212 VERIZON MARYLAND, INC. 238      
443-573 A Baltimore MD   829J PAETEC ITEL, LLC 238   2025-04-01   
443-574 A Ellicott City MD   829J PAETEC ITEL, LLC 238   2025-04-01   
443-575 A Arbutus MD   829J PAETEC ITEL, LLC 238   2025-04-01   
443-576 A Randallstown MD BLTMMDCHXNX  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238      
443-577 A Glen Burnie MD   829J PAETEC ITEL, LLC 238   2025-04-01   
443-578 A Cockeysville MD BLTMMDSNDS5  4773 XO MARYLAND, LLC 238      
443-579 A Essex MD   829J PAETEC ITEL, LLC 238   2025-04-01   
443-580 A Baltimore MD BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2024-02-09   
443-581 A Chase MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238      
443-582 A Churchville MD   829J PAETEC ITEL, LLC 238   2025-04-01   
443-583 A Columbia MD   829J PAETEC ITEL, LLC 238   2025-04-01   
443-584 A Crofton MD   829J PAETEC ITEL, LLC 238   2025-04-01   
443-585 A Darlington MD   829J PAETEC ITEL, LLC 238   2025-04-01   
443-586 A Dundalk MD BLTMMD91GT0  2593 CORE COMMUNICATIONS, INC.- MD 238      
443-587 A Edgewood MD   829J PAETEC ITEL, LLC 238   2025-04-01   
443-588 A Parkville MD BLTMMDCHXNX  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238      
443-589 A Cockeysville MD   829J PAETEC ITEL, LLC 238   2025-04-01   
443-590 A Reisterstown MD   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238      
443-591 A Glen Burnie MD BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238      
443-592 A Elkridge MD BLTMMD91GT0  2593 CORE COMMUNICATIONS, INC.- MD 238      
443-593 A Elkton MD   829J PAETEC ITEL, LLC 238   2025-04-01   
443-594 A Sparrows Point MD   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238      
443-595 A Sparks-Glencoe MD   071F BANDWIDTH.COM CLEC, LLC - MD 238   2025-04-14   
443-596 A Essex MD BLTMMD91GT0  2593 CORE COMMUNICATIONS, INC.- MD 238      
443-597 A Severna Park MD   5562 METROPCS, INC. 238      
443-598 A Sherwood Forest MD   071F BANDWIDTH.COM CLEC, LLC - MD 238      
443-599 A Severn MD   5562 METROPCS, INC. 238      
443-600 A Essex MD BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238      
443-601 A Fallston MD   829J PAETEC ITEL, LLC 238   2025-04-01   
443-602 A Baltimore MD BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238      
443-603 A Annapolis MD   829J PAETEC ITEL, LLC 238   2025-04-01   
443-604 A Baltimore MD BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238      

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Last updated: Thu, 16 Oct 2025 03:04:18 UTC

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