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
443-200 A Woodlawn MD BLTMMDCHXNX  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238      
443-200 0 Woodlawn MD BLTMMDCHXNX  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238      
443-200 1 Woodlawn MD BLTMMDCHXNX  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238      
443-200 2 Woodlawn MD BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238   2006-08-04   
443-200 3 Woodlawn MD BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238   2005-03-10   
443-200 4 Woodlawn MD BLTMMDCHXNX  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238      
443-200 5 Woodlawn MD BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238   2006-08-04   
443-200 6 Woodlawn MD BLTMMDCHXNX  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238      
443-200 7 Woodlawn MD BLTMMDCHXNX  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238      
443-200 8 Woodlawn MD BLTMMDCHXHX  515J IP HORIZON LLC 238   2021-08-15   
443-200 9 Woodlawn MD BLTMMDCHXNX  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238      
443-201 A Westminster MD CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238      
443-201 0 Westminster MD   515J IP HORIZON LLC 238   2013-09-06   
443-201 1 Westminster MD BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2015-06-05   
443-201 2 Westminster MD BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2012-02-27   
443-201 3 Westminster MD CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2014-10-01   
443-201 4 Westminster MD CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2015-08-31   
443-201 5 Westminster MD BLTMMDDN2MD  508J CENTURYLINK COMMUNICATIONS, LLC 238   2014-04-02   
443-201 6 Westminster MD CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2012-09-01   
443-201 7 Westminster MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2012-10-08   
443-201 8 Westminster MD BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238   2013-11-13   
443-201 9 Westminster MD BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238   2015-09-04   
443-202 A Baltimore MD BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238      
443-202 0 Baltimore MD BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2012-04-01   
443-202 1 Baltimore MD BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2012-04-01   
443-202 2 Baltimore MD BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2012-04-01   
443-202 3 Baltimore MD BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2012-04-01   
443-202 4 Baltimore MD BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2012-04-01   
443-202 5 Baltimore MD BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2012-04-01   
443-202 6 Baltimore MD BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2012-04-01   
443-202 7 Baltimore MD BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2012-04-01   
443-202 8 Baltimore MD BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2012-04-01   
443-202 9 Baltimore MD BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2012-04-01   
443-203 A West River MD MAYOMDMYRS1  9212 VERIZON MARYLAND, INC. 238      
443-203 0 West River MD MAYOMDMYRS1  9212 VERIZON MARYLAND, INC. 238      
443-203 1 West River MD BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2005-04-03   
443-203 2 West River MD BLTMMDCHXNX  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238   2008-06-20   
443-203 3 West River MD BLTQMD018MD  145J TERRA NOVA TELECOM INC. 238   2024-07-16   
443-203 4 West River MD BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2003-08-20   
443-203 5 West River MD BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2006-03-31   
443-203 6 West River MD BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238   2005-03-10   
443-203 7 West River MD BLTMMDDN2MD  508J CENTURYLINK COMMUNICATIONS, LLC 238   2014-06-25   
443-203 8 West River MD BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2010-06-26   
443-203 9 West River MD BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2008-12-11   
443-204 A Pikesville MD CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238      
443-204 0 Pikesville MD CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2003-07-06   
443-204 1 Pikesville MD CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2003-07-06   
443-204 2 Pikesville MD CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2003-07-06   
443-204 3 Pikesville MD CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2003-07-06   
443-204 4 Pikesville MD CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2006-02-01   
443-204 5 Pikesville MD CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2007-01-25   
443-204 6 Pikesville MD CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2006-04-16   
443-204 7 Pikesville MD CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2007-01-25   
443-204 8 Pikesville MD OWMLMDOMDS0  9212 VERIZON MARYLAND, INC. 238   2003-11-14   
443-204 9 Pikesville MD CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2010-03-29   
443-205 A Cambridge MD ESTNMDESQMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 242      
443-205 0 Cambridge MD ESTNMDESQMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 242   2004-06-03   
443-205 1 Cambridge MD SLBRMDSBXFX  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 242   2013-09-16   
443-205 2 Cambridge MD ESTNMDESQMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 242   2006-08-07   
443-205 3 Cambridge MD ESTNMDESQMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 242   2005-07-22   
443-205 4 Cambridge MD SLBRMDSBXFX  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 242   2004-07-16   
443-205 5 Cambridge MD ESTNMDESQMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 242   2004-03-18   
443-205 6 Cambridge MD SLBRMDSBXVX  876D ONVOY, LLC - MD 242   2024-03-02   
443-205 7 Cambridge MD SLBRMDSBXVX  876D ONVOY, LLC - MD 242   2024-04-04   
443-205 8 Cambridge MD   145J TERRA NOVA TELECOM INC. 242   2022-11-07   
443-205 9 Cambridge MD ESTNMDESQMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 242   2007-05-03   
443-206 A Perryville MD BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238      
443-206 0 Perryville MD BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238      
443-206 1 Perryville MD BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238      
443-206 2 Perryville MD BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238      
443-206 3 Perryville MD BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238      
443-206 4 Perryville MD BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238      
443-206 5 Perryville MD BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238      
443-206 6 Perryville MD BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238      
443-206 7 Perryville MD   2593 CORE COMMUNICATIONS, INC.- MD 238   2004-04-02   
443-206 8 Perryville MD BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2006-03-04   
443-206 9 Perryville MD BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238      
443-207 A Elkton MD BLTMMDCH40Z  6626 OMNIPOINT COMMUNICATIONS ENTERPRISES, LP 238      
443-207 0 Elkton MD BLTMMDCH40Z  6626 OMNIPOINT COMMUNICATIONS ENTERPRISES, LP 238      
443-207 1 Elkton MD BLTMMDCH40Z  6626 OMNIPOINT COMMUNICATIONS ENTERPRISES, LP 238      
443-207 2 Elkton MD BLTMMDCH40Z  6626 OMNIPOINT COMMUNICATIONS ENTERPRISES, LP 238      
443-207 3 Elkton MD BLTMMDCH40Z  6626 OMNIPOINT COMMUNICATIONS ENTERPRISES, LP 238   2011-03-03   
443-207 4 Elkton MD BLTMMDCH40Z  6626 OMNIPOINT COMMUNICATIONS ENTERPRISES, LP 238   2013-12-06   
443-207 5 Elkton MD BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238   2012-02-07   
443-207 6 Elkton MD BLTMMDCH40Z  6626 OMNIPOINT COMMUNICATIONS ENTERPRISES, LP 238      
443-207 7 Elkton MD BLTMMDCH40Z  5562 METROPCS, INC. 238   2014-12-15   
443-207 8 Elkton MD BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238   2012-03-09   
443-207 9 Elkton MD BLTMMDCH40Z  6626 OMNIPOINT COMMUNICATIONS ENTERPRISES, LP 238      
443-208 A Baltimore MD BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238      
443-208 0 Baltimore MD BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2011-03-18   
443-208 1 Baltimore MD BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2011-03-18   
443-208 2 Baltimore MD BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2011-03-18   
443-208 3 Baltimore MD BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2011-03-18   
443-208 4 Baltimore MD BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2011-03-18   
443-208 5 Baltimore MD BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2011-03-18   
443-208 6 Baltimore MD BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2011-03-18   
443-208 7 Baltimore MD BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2011-03-18   
443-208 8 Baltimore MD BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2011-03-18   
443-208 9 Baltimore MD BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2011-03-18   
443-209 A Havre de Grace MD   829J PAETEC ITEL, LLC 238   2025-04-01   

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: VoIP.ms

Like this site? We accept donations via PayPal.