Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
  • Effective date searches are available only for US area codes. Our sources for non-US NPA-NXX data do not provide this information.
  • If you want to search an entire area code regardless of activity, leave both the next and past days fields set to zero.

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

<< 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 >>

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
443-657 2 Randallstown MD BLTMMDSNNMD  7591 LEVEL 3 TELECOM OF MARYLAND, LLC - MD 238      
443-657 3 Randallstown MD BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2014-11-08   
443-657 6 Randallstown MD BLTQMD018MD  145J TERRA NOVA TELECOM INC. 238   2024-02-15   
443-657 7 Randallstown MD BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238   2015-11-14   
443-657 8 Randallstown MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2024-02-29   
443-657 9 Randallstown MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2024-02-29   
443-658 A Woodlawn MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238      
443-659 A West River MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238      
443-660 A Pikesville MD BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238      
443-660 0 Pikesville MD   515J IP HORIZON LLC 238   2013-09-06   
443-660 1 Pikesville MD BLTOMDKHDS0  7228 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 238   2005-06-05   
443-660 2 Pikesville MD BLTOMDKHDS0  7228 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 238   2005-06-05   
443-660 3 Pikesville MD BLTOMDKHDS0  7228 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 238   2005-06-05   
443-660 4 Pikesville MD CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2022-12-12   
443-660 5 Pikesville MD BLTOMDKHDS0  7228 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 238   2005-06-05   
443-660 6 Pikesville MD CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2012-09-24   
443-660 7 Pikesville MD BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238   2012-09-21   
443-660 8 Pikesville MD BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238   2006-06-03   
443-660 9 Pikesville MD BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238      
443-661 A Waterloo MD   829J PAETEC ITEL, LLC 238   2025-04-01   
443-661 0 Waterloo MD   829J PAETEC ITEL, LLC 238      
443-661 1 Waterloo MD   829J PAETEC ITEL, LLC 238      
443-661 2 Waterloo MD   515J IP HORIZON LLC 238   2017-07-07   
443-661 3 Waterloo MD   829J PAETEC ITEL, LLC 238      
443-661 4 Waterloo MD BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238   2008-10-06   
443-661 5 Waterloo MD   829J PAETEC ITEL, LLC 238      
443-661 7 Waterloo MD BLTMMDCHXVX  321J HD CARRIER LLC 238   2020-05-02   
443-661 8 Waterloo MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2021-04-29   
443-661 9 Waterloo MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2022-09-25   
443-662 A Sparks-Glencoe MD   829J PAETEC ITEL, LLC 238   2025-04-01   
443-662 0 Sparks-Glencoe MD   829J PAETEC ITEL, LLC 238      
443-662 1 Sparks-Glencoe MD   829J PAETEC ITEL, LLC 238      
443-662 2 Sparks-Glencoe MD   2593 CORE COMMUNICATIONS, INC.- MD 238   2018-06-16   
443-662 3 Sparks-Glencoe MD   2593 CORE COMMUNICATIONS, INC.- MD 238   2018-06-16   
443-662 4 Sparks-Glencoe MD CLMAMDNIDS1  7325 TELEPORT COMMUNICATIONS AMERICA, LLC - MD 238   2004-07-24   
443-662 5 Sparks-Glencoe MD BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2020-07-03   
443-662 6 Sparks-Glencoe MD BLTMMDCHX7X  073H TELNYX LLC 238   2017-04-26   
443-662 7 Sparks-Glencoe MD BLTQMD01DS0  568G PEERLESS NETWORK OF MARYLAND, LLC 238   2013-05-04   
443-662 8 Sparks-Glencoe MD BLTQMD01DS0  568G PEERLESS NETWORK OF MARYLAND, LLC 238   2013-05-04   
443-662 9 Sparks-Glencoe MD   829J PAETEC ITEL, LLC 238      
443-663 A Woodlawn MD WDLWMDWLDS0  9212 VERIZON MARYLAND, INC. 238      
443-663 0 Woodlawn MD BLTMMDCH25Z  8697 BALTIMORE-WASHINGTON TELEPHONE (BWT) 238   2015-06-20   
443-663 1 Woodlawn MD BLTQMD018MD  145J TERRA NOVA TELECOM INC. 238   2024-09-11   
443-663 2 Woodlawn MD   2593 CORE COMMUNICATIONS, INC.- MD 238   2019-05-02   
443-663 3 Woodlawn MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2016-03-14   
443-663 4 Woodlawn MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2015-10-05   
443-663 5 Woodlawn MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2016-03-14   
443-663 6 Woodlawn MD WDLWMDWLDS0  9212 VERIZON MARYLAND, INC. 238      
443-663 7 Woodlawn MD BLTMMDDN2MD  508J CENTURYLINK COMMUNICATIONS, LLC 238   2014-06-25   
443-663 8 Woodlawn MD WDLWMDWLDS0  9212 VERIZON MARYLAND, INC. 238      
443-663 9 Woodlawn MD   515J IP HORIZON LLC 238   2016-05-31   
443-664 A Ocean City MD   829J PAETEC ITEL, LLC 242   2025-04-01   
443-664 0 Ocean City MD   829J PAETEC ITEL, LLC 242      
443-664 1 Ocean City MD   829J PAETEC ITEL, LLC 242      
443-664 2 Ocean City MD SLBRMDSBXLX  318J COMCAST IP PHONE, LLC 242   2008-04-30   
443-664 3 Ocean City MD SLBRMDSBXVX  876D ONVOY, LLC - MD 242   2020-08-09   
443-664 4 Ocean City MD   829J PAETEC ITEL, LLC 242      
443-664 5 Ocean City MD SLBRMDSBXLX  318J COMCAST IP PHONE, LLC 242   2012-05-25   
443-664 6 Ocean City MD SLBRMDSBXLX  318J COMCAST IP PHONE, LLC 242   2006-07-31   
443-664 7 Ocean City MD SLBRMDSBXLX  318J COMCAST IP PHONE, LLC 242   2014-11-17   
443-664 8 Ocean City MD SLBRMDSBXLX  318J COMCAST IP PHONE, LLC 242   2017-07-10   
443-664 9 Ocean City MD   829J PAETEC ITEL, LLC 242      
443-665 A Nanticoke MD SLBRMD90DS0  2593 CORE COMMUNICATIONS, INC.- MD 242      
443-665 0 Nanticoke MD SLBRMDSBXVX  876D ONVOY, LLC - MD 242   2020-04-30   
443-665 1 Nanticoke MD SLBRMDSBX0X  624H ONVOY SPECTRUM, LLC 242   2021-05-27   
443-665 2 Nanticoke MD SLBRMDSBXVX  876D ONVOY, LLC - MD 242   2023-05-18   
443-665 3 Nanticoke MD   2593 CORE COMMUNICATIONS, INC.- MD 242   2018-06-17   
443-665 4 Nanticoke MD SLBRMDSBXLX  318J COMCAST IP PHONE, LLC 242   2006-07-31   
443-665 5 Nanticoke MD   2593 CORE COMMUNICATIONS, INC.- MD 242   2018-06-17   
443-665 6 Nanticoke MD SLBRMD90DS0  2593 CORE COMMUNICATIONS, INC.- MD 242   2019-05-02   
443-665 7 Nanticoke MD   2593 CORE COMMUNICATIONS, INC.- MD 242   2018-06-17   
443-665 8 Nanticoke MD SLBRMDSBXVX  876D ONVOY, LLC - MD 242   2020-04-30   
443-665 9 Nanticoke MD SLBRMDSBXVX  876D ONVOY, LLC - MD 242   2020-04-30   
443-666 A Chestertown MD SLBRMDSBXFX  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 242      
443-666 0 Chestertown MD ESTNMDESQMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 242   2018-01-25   
443-666 1 Chestertown MD SLBRMDSCXMD  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 242   2021-04-08   
443-666 2 Chestertown MD   829J PAETEC ITEL, LLC 242   2014-11-08   
443-666 3 Chestertown MD SLBRMDSBXFX  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 242   2012-08-02   
443-666 4 Chestertown MD SLBRMDSCXLX  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 242   2016-03-11   
443-666 5 Chestertown MD   2593 CORE COMMUNICATIONS, INC.- MD 242   2019-05-02   
443-666 6 Chestertown MD SLBRMDSBXUX  7325 TELEPORT COMMUNICATIONS AMERICA, LLC - MD 242   2014-10-20   
443-666 7 Chestertown MD SLBRMDSCXLX  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 242   2018-08-27   
443-666 8 Chestertown MD SLBRMD902MD  073H TELNYX LLC 242   2017-09-13   
443-666 9 Chestertown MD SLBRMDSCXMD  5562 METROPCS, INC. 242   2021-05-10   
443-667 A Delmar MD ESTNMDESQMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 242      
443-667 0 Delmar MD ESTNMDESQMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 242   2023-07-20   
443-667 1 Delmar MD ESTNMDESQMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 242   2024-04-04   
443-667 2 Delmar MD ESTNMDESQMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 242   2024-06-06   
443-667 3 Delmar MD ESTNMDESQMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 242   2025-04-12   
443-667 4 Delmar MD   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 242   2025-01-09   
443-667 5 Delmar MD SLBRMD901MD  939H COMMIO, LLC 242   2023-09-30   
443-667 6 Delmar MD SLBRMD901MD  939H COMMIO, LLC 242   2023-09-30   
443-667 7 Delmar MD SLBRMD901MD  939H COMMIO, LLC 242   2023-09-30   
443-667 8 Delmar MD SLBRMD901MD  939H COMMIO, LLC 242   2023-09-30   
443-667 9 Delmar MD SLBRMD901MD  939H COMMIO, LLC 242   2023-09-30   
443-668 A Catonsville MD CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238      
443-668 0 Catonsville MD CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238      
443-668 1 Catonsville MD CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238      
443-668 2 Catonsville MD CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238      
443-668 3 Catonsville MD CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238      

<< 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 >>

Last updated: Sat, 05 Apr 2025 03:03:23 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.