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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
443-778 0 Waterloo (Washington DC LATA) MD   9212 VERIZON MARYLAND, INC. 236      
443-778 1 Waterloo (Washington DC LATA) MD   9212 VERIZON MARYLAND, INC. 236   2002-06-25   
443-778 2 Waterloo (Washington DC LATA) MD   9212 VERIZON MARYLAND, INC. 236   2003-02-15   
443-778 3 Waterloo (Washington DC LATA) MD   9212 VERIZON MARYLAND, INC. 236      
443-778 4 Waterloo (Washington DC LATA) MD   9212 VERIZON MARYLAND, INC. 236      
443-778 5 Waterloo (Washington DC LATA) MD   9212 VERIZON MARYLAND, INC. 236      
443-778 6 Waterloo (Washington DC LATA) MD   9212 VERIZON MARYLAND, INC. 236      
443-778 7 Waterloo (Washington DC LATA) MD   9212 VERIZON MARYLAND, INC. 236      
443-778 8 Waterloo (Washington DC LATA) MD   9212 VERIZON MARYLAND, INC. 236      
443-778 9 Waterloo (Washington DC LATA) MD   9212 VERIZON MARYLAND, INC. 236   2003-02-15   
443-779 A Aberdeen MD BLTMMDCHXNX  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236      
443-779 0 Aberdeen MD   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236   2016-02-06   
443-779 1 Aberdeen MD   145J TERRA NOVA TELECOM INC. 236   2024-07-16   
443-779 2 Aberdeen MD   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236   2010-10-20   
443-779 3 Aberdeen MD   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236   2010-10-20   
443-779 4 Aberdeen MD   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236   2010-10-20   
443-779 5 Aberdeen MD   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236   2010-10-20   
443-779 6 Aberdeen MD   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236   2010-10-20   
443-779 7 Aberdeen MD   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236   2010-10-20   
443-779 8 Aberdeen MD   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236   2010-10-20   
443-779 9 Aberdeen MD   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236   2013-12-27   
443-780 A Woodlawn MD   829J PAETEC ITEL, LLC 238   2025-04-01   
443-780 0 Woodlawn MD   829J PAETEC ITEL, LLC 238      
443-780 1 Woodlawn MD   829J PAETEC ITEL, LLC 238      
443-780 2 Woodlawn MD   829J PAETEC ITEL, LLC 238      
443-780 3 Woodlawn MD   829J PAETEC ITEL, LLC 238      
443-780 4 Woodlawn MD   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2017-11-24   
443-780 5 Woodlawn MD   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2017-11-24   
443-780 6 Woodlawn MD   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2019-06-21   
443-780 7 Woodlawn MD   964H BARR TELL USA, INC. 238   2016-12-17   
443-780 8 Woodlawn MD   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2025-02-14   
443-780 9 Woodlawn MD   829J PAETEC ITEL, LLC 238      
443-781 A Armiger-Gibson Island MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2024-03-05   
443-781 0 Armiger-Gibson Island MD   2593 CORE COMMUNICATIONS, INC.- MD 238   2019-04-30   
443-781 1 Armiger-Gibson Island MD   624H ONVOY SPECTRUM, LLC 238   2022-02-11   
443-781 2 Armiger-Gibson Island MD   624H ONVOY SPECTRUM, LLC 238   2022-02-11   
443-781 3 Armiger-Gibson Island MD   318J COMCAST IP PHONE, LLC 238   2018-02-08   
443-781 4 Armiger-Gibson Island MD   071F BANDWIDTH.COM CLEC, LLC - MD 238   2019-04-20   
443-781 5 Armiger-Gibson Island MD   876D ONVOY, LLC - MD 238   2021-03-04   
443-781 6 Armiger-Gibson Island MD   876D ONVOY, LLC - MD 238   2021-03-04   
443-781 7 Armiger-Gibson Island MD   876D ONVOY, LLC - MD 238   2025-09-28   
443-781 8 Armiger-Gibson Island MD   876D ONVOY, LLC - MD 238   2019-02-19   
443-781 9 Armiger-Gibson Island MD   876D ONVOY, LLC - MD 238   2019-02-19   
443-782 A Annapolis MD BLTMMDCHXNX  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238      
443-782 0 Annapolis MD   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238      
443-782 1 Annapolis MD   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2024-06-27   
443-782 2 Annapolis MD   2593 CORE COMMUNICATIONS, INC.- MD 238   2018-10-30   
443-782 3 Annapolis MD   876D ONVOY, LLC - MD 238   2017-06-02   
443-782 4 Annapolis MD   876D ONVOY, LLC - MD 238   2018-05-27   
443-782 5 Annapolis MD   071F BANDWIDTH.COM CLEC, LLC - MD 238   2018-06-08   

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

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