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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
443-706 3 Crisfield MD ESTNMDES5MD  7228 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 242   2009-03-02   
443-706 4 Crisfield MD   145J TERRA NOVA TELECOM INC. 242   2024-10-12   
443-706 5 Crisfield MD   145J TERRA NOVA TELECOM INC. 242   2025-07-25   
443-706 7 Crisfield MD SLBRMDSBXUX  7325 TELEPORT COMMUNICATIONS AMERICA, LLC - MD 242   2016-10-10   
443-706 8 Crisfield MD SLBRMDSBXVX  876D ONVOY, LLC - MD 242   2017-04-13   
443-706 9 Crisfield MD SLBRMDSBXVX  876D ONVOY, LLC - MD 242   2021-04-29   
443-707 A Aberdeen MD BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236      
443-707 0 Aberdeen MD BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236   2014-11-08   
443-707 1 Aberdeen MD   515J IP HORIZON LLC 236   2014-08-08   
443-707 2 Aberdeen MD BLTMMDCH42Z  876D ONVOY, LLC - MD 236   2015-07-29   
443-707 3 Aberdeen MD BLTMMDCH42Z  876D ONVOY, LLC - MD 236   2015-07-29   
443-707 4 Aberdeen MD BLTOMDKHDS0  7228 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 236   2014-11-17   
443-707 5 Aberdeen MD BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236   2015-01-31   
443-707 6 Aberdeen MD BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236   2015-01-31   
443-707 7 Aberdeen MD BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236   2015-01-31   
443-707 8 Aberdeen MD BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236   2014-11-08   
443-707 9 Aberdeen MD BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236   2014-11-08   
443-708 A Baltimore MD BLTMMDSNNMD  7591 LEVEL 3 TELECOM OF MARYLAND, LLC - MD 238      
443-708 0 Baltimore MD BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238   2006-12-14   
443-708 1 Baltimore MD BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238   2006-12-14   
443-708 2 Baltimore MD BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238   2006-12-14   
443-708 3 Baltimore MD BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238   2006-12-14   
443-708 4 Baltimore MD BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238   2006-12-14   
443-708 5 Baltimore MD BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238   2006-12-14   
443-708 6 Baltimore MD BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2008-04-08   
443-708 7 Baltimore MD BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238   2007-09-20   
443-708 8 Baltimore MD BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238   2007-09-20   
443-708 9 Baltimore MD BLTMMDSNNMD  7591 LEVEL 3 TELECOM OF MARYLAND, LLC - MD 238      
443-709 A Arbutus MD PIVLMDPKXGX  829J PAETEC ITEL, LLC 238   2025-04-01   
443-709 0 Arbutus MD PIVLMDPKXGX  829J PAETEC ITEL, LLC 238   2001-11-05   
443-709 1 Arbutus MD BLTMMDCHXUX  624H ONVOY SPECTRUM, LLC 238   2021-12-30   
443-709 2 Arbutus MD PIVLMDPKXGX  829J PAETEC ITEL, LLC 238   2001-11-05   
443-709 3 Arbutus MD PIVLMDPKXGX  829J PAETEC ITEL, LLC 238   2001-11-05   
443-709 4 Arbutus MD PIVLMDPKXGX  829J PAETEC ITEL, LLC 238   2001-11-05   
443-709 5 Arbutus MD BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2005-02-11   
443-709 6 Arbutus MD BLTMMDCHXUX  624H ONVOY SPECTRUM, LLC 238   2021-05-23   
443-709 7 Arbutus MD BLTMMDCH40Z  5562 METROPCS, INC. 238   2013-06-14   
443-709 8 Arbutus MD BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2016-09-08   
443-709 9 Arbutus MD PIVLMDPKXGX  829J PAETEC ITEL, LLC 238   2001-11-05   
443-710 A Catonsville MD BLTMMDCHXNX  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238      
443-710 0 Catonsville MD BLTMMDCHXNX  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238      
443-710 1 Catonsville MD CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2005-03-19   
443-710 2 Catonsville MD CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2005-03-19   
443-710 3 Catonsville MD CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2005-03-19   
443-710 4 Catonsville MD BLTMMDCHXNX  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238      
443-710 5 Catonsville MD CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2005-03-19   
443-710 6 Catonsville MD CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2005-03-19   
443-710 7 Catonsville MD CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2005-03-19   
443-710 8 Catonsville MD BLTMMDCHXNX  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238      
443-710 9 Catonsville MD CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2005-03-19   

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Last updated: Tue, 01 Sep 2026 00:40:05 UTC

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