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
443-441 7 Glenwood MD BLTMMDDN2MD  508J CENTURYLINK COMMUNICATIONS, LLC 238   2014-06-12   
443-441 8 Glenwood MD   515J IP HORIZON LLC 238   2016-05-31   
443-441 9 Glenwood MD BLTMMDFMDS0  7325 TELEPORT COMMUNICATIONS AMERICA, LLC - MD 238      
443-442 A Parkville MD   829J PAETEC ITEL, LLC 238   2025-04-01   
443-442 0 Parkville MD   829J PAETEC ITEL, LLC 238      
443-442 1 Parkville MD   829J PAETEC ITEL, LLC 238      
443-442 2 Parkville MD   829J PAETEC ITEL, LLC 238      
443-442 3 Parkville MD CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2020-05-11   
443-442 4 Parkville MD BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2014-07-01   
443-442 5 Parkville MD CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2020-05-11   
443-442 6 Parkville MD BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238   2014-07-18   
443-442 7 Parkville MD BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2015-10-01   
443-442 8 Parkville MD   829J PAETEC ITEL, LLC 238      
443-442 9 Parkville MD BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2021-11-04   
443-443 A Arbutus MD BLTQMD013MD  939H COMMIO, LLC 238   2024-01-22   
443-443 0 Arbutus MD BLTQMD013MD  939H COMMIO, LLC 238   2024-01-22   
443-443 1 Arbutus MD BLTQMD013MD  939H COMMIO, LLC 238   2024-01-22   
443-443 2 Arbutus MD BLTQMD013MD  939H COMMIO, LLC 238   2024-01-22   
443-443 3 Arbutus MD BLTQMD013MD  939H COMMIO, LLC 238   2024-01-22   
443-443 4 Arbutus MD BLTQMD013MD  939H COMMIO, LLC 238   2024-01-22   
443-443 5 Arbutus MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2024-03-08   
443-443 6 Arbutus MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2024-04-13   
443-443 8 Arbutus MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2024-07-15   
443-443 9 Arbutus MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2024-07-15   
443-444 A Baltimore MD BLTMMDYKDS0  9212 VERIZON MARYLAND, INC. 238      
443-444 0 Baltimore MD BLTMMDYKDS0  9212 VERIZON MARYLAND, INC. 238   2005-08-27   
443-444 1 Baltimore MD BLTMMDYKDS0  9212 VERIZON MARYLAND, INC. 238   2005-08-27   
443-444 2 Baltimore MD BLTMMDYKDS0  9212 VERIZON MARYLAND, INC. 238   2005-08-27   
443-444 3 Baltimore MD BLTMMDYKDS0  9212 VERIZON MARYLAND, INC. 238   2005-08-27   
443-444 4 Baltimore MD BLTMMDYKDS0  9212 VERIZON MARYLAND, INC. 238   2005-08-27   
443-444 5 Baltimore MD BLTMMDYKDS0  9212 VERIZON MARYLAND, INC. 238   2005-08-27   
443-444 6 Baltimore MD BLTMMDYKDS0  9212 VERIZON MARYLAND, INC. 238   2005-08-27   
443-444 7 Baltimore MD BLTMMDYKDS0  9212 VERIZON MARYLAND, INC. 238   2005-08-27   
443-444 8 Baltimore MD BLTMMDYKDS0  9212 VERIZON MARYLAND, INC. 238   2005-08-27   
443-444 9 Baltimore MD BLTMMDYKDS0  9212 VERIZON MARYLAND, INC. 238   2005-08-27   
443-445 A Elkridge MD EKRGMDELDS0  9212 VERIZON MARYLAND, INC. 238      
443-445 0 Elkridge MD BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2010-02-25   
443-445 1 Elkridge MD BLTQMD01DS0  568G PEERLESS NETWORK OF MARYLAND, LLC 238   2015-04-17   
443-445 2 Elkridge MD BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2006-06-26   
443-445 3 Elkridge MD BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238   2005-03-10   
443-445 6 Elkridge MD BLTMMDCHXNX  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238   2005-02-15   
443-445 7 Elkridge MD EKRGMDELDS0  9212 VERIZON MARYLAND, INC. 238   2004-02-16   
443-445 8 Elkridge MD EKRGMDELDS0  9212 VERIZON MARYLAND, INC. 238   2004-02-16   
443-445 9 Elkridge MD BLTMMDCHXNX  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238   2001-11-19   
443-446 A Queenstown MD ESTNMDES5MD  7228 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 242      
443-446 1 Queenstown MD   2593 CORE COMMUNICATIONS, INC.- MD 242   2019-05-03   
443-446 2 Queenstown MD   2593 CORE COMMUNICATIONS, INC.- MD 242   2019-03-29   
443-446 3 Queenstown MD SLBRMDSBXVX  876D ONVOY, LLC - MD 242   2021-03-05   
443-446 4 Queenstown MD SLBRMDSBXVX  876D ONVOY, LLC - MD 242   2018-09-13   
443-446 5 Queenstown MD SLBRMDSBXVX  876D ONVOY, LLC - MD 242   2021-03-05   
443-446 6 Queenstown MD   2593 CORE COMMUNICATIONS, INC.- MD 242   2019-03-29   
443-446 7 Queenstown MD   2593 CORE COMMUNICATIONS, INC.- MD 242   2019-03-29   
443-446 8 Queenstown MD   2593 CORE COMMUNICATIONS, INC.- MD 242   2019-05-03   
443-446 9 Queenstown MD   2593 CORE COMMUNICATIONS, INC.- MD 242   2019-05-03   
443-447 A Baltimore MD CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238      
443-447 0 Baltimore MD CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2009-03-31   
443-447 1 Baltimore MD CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2009-04-01   
443-447 2 Baltimore MD CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2009-04-01   
443-447 3 Baltimore MD CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2009-04-01   
443-447 4 Baltimore MD CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2009-04-01   
443-447 5 Baltimore MD CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2009-04-01   
443-447 6 Baltimore MD CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2009-04-01   
443-447 7 Baltimore MD CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2009-04-01   
443-447 8 Baltimore MD CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2009-04-01   
443-447 9 Baltimore MD CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2009-04-01   
443-448 A Denton MD SLBRMDSBXLX  318J COMCAST IP PHONE, LLC 242      
443-448 1 Denton MD SLBRMDSBXVX  876D ONVOY, LLC - MD 242   2021-03-05   
443-448 2 Denton MD SLBRMDSBX0X  624H ONVOY SPECTRUM, LLC 242   2021-12-09   
443-448 3 Denton MD ESTNMDES5MD  7228 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 242   2015-11-02   
443-448 4 Denton MD SLBRMDSBXLX  318J COMCAST IP PHONE, LLC 242   2006-07-31   
443-448 5 Denton MD SLBRMDSBXFX  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 242   2016-10-16   
443-448 6 Denton MD SLBRMDSBXUX  7325 TELEPORT COMMUNICATIONS AMERICA, LLC - MD 242   2014-06-25   
443-448 7 Denton MD SLBRMDSBXLX  318J COMCAST IP PHONE, LLC 242   2015-03-20   
443-448 8 Denton MD SLBRMDSBXVX  876D ONVOY, LLC - MD 242   2017-04-13   
443-448 9 Denton MD SLBRMD902MD  073H TELNYX LLC 242   2017-09-13   
443-449 A Baltimore MD   829J PAETEC ITEL, LLC 238   2025-04-01   
443-449 0 Baltimore MD BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2007-07-22   
443-449 1 Baltimore MD BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2007-07-22   
443-449 2 Baltimore MD   829J PAETEC ITEL, LLC 238   2007-05-19   
443-449 3 Baltimore MD BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2008-04-08   
443-449 4 Baltimore MD BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2008-06-16   
443-449 5 Baltimore MD BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238   2007-07-27   
443-449 6 Baltimore MD BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238   2007-07-27   
443-449 7 Baltimore MD BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238   2007-07-27   
443-449 8 Baltimore MD BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2007-08-17   
443-449 9 Baltimore MD BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2007-08-17   
443-450 A Pikesville MD BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238      
443-450 0 Pikesville MD BLTQMD012MD  964H BARR TELL USA, INC. 238   2016-12-17   
443-450 1 Pikesville MD BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2012-07-29   
443-450 2 Pikesville MD CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2022-10-03   
443-450 3 Pikesville MD BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238   2013-07-17   
443-450 4 Pikesville MD BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238      
443-450 5 Pikesville MD BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238   2015-09-14   
443-450 6 Pikesville MD BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238   2018-02-01   
443-450 7 Pikesville MD BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238   2019-07-05   
443-450 8 Pikesville MD BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2014-12-13   
443-450 9 Pikesville MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2016-01-14   
443-451 A Baltimore MD   829J PAETEC ITEL, LLC 238   2025-04-01   
443-452 A Baltimore MD   829J PAETEC ITEL, LLC 238   2025-04-01   
443-452 0 Baltimore MD BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2006-02-07   

<< 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: Wed, 18 Jun 2025 02:30:00 UTC

Sponsored by: BeeVox - Whitelabel Reseller Platform

Like this site? We accept donations via PayPal.