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.

Columbia, MD

<< 1 2 3 4 5 >>

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
443-812 5   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238      
443-812 6   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238      
443-812 7   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238      
443-812 8   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2003-08-19   
443-812 9   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2003-10-03   
443-832 A BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238      
443-832 0   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2011-10-28   
443-832 1   829J PAETEC ITEL, LLC 238   2009-10-26   
443-832 2   7228 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 238   2009-11-13   
443-832 3   071F BANDWIDTH.COM CLEC, LLC - MD 238   2010-08-15   
443-832 4   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238      
443-832 5   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2011-10-28   
443-832 6   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2013-07-21   
443-832 7   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2010-11-01   
443-832 8   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2011-07-15   
443-832 9   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2011-07-15   
443-864 A BLTMMDCH40Z  5562 METROPCS, INC. 238      
443-864 0   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238      
443-864 1   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238      
443-864 2   5562 METROPCS, INC. 238   2003-04-13   
443-864 3   5562 METROPCS, INC. 238   2003-11-01   
443-864 4   318J COMCAST IP PHONE, LLC 238   2007-10-19   
443-864 5   318J COMCAST IP PHONE, LLC 238   2007-10-19   
443-864 6   5562 METROPCS, INC. 238      
443-864 7   5562 METROPCS, INC. 238      
443-864 8   5562 METROPCS, INC. 238      
443-864 9   5562 METROPCS, INC. 238      
443-878 A BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238      
443-878 0   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2010-02-16   
443-878 1   829J PAETEC ITEL, LLC 238   2005-08-25   
443-878 2   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2005-09-20   
443-878 3   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2006-03-04   
443-878 4   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2006-04-01   
443-878 5   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2006-04-24   
443-878 6   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2006-04-24   
443-878 7   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2006-02-03   
443-878 8   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2005-07-22   
443-878 9   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2006-04-24   
443-896 A BLTMMDCHCMD  7325 TELEPORT COMMUNICATIONS AMERICA, LLC - MD 238      
443-896 0   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238      
443-896 1   7325 TELEPORT COMMUNICATIONS AMERICA, LLC - MD 238      
443-896 2   7325 TELEPORT COMMUNICATIONS AMERICA, LLC - MD 238      
443-896 3   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2006-11-02   
443-896 4   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2006-11-02   
443-896 5   7325 TELEPORT COMMUNICATIONS AMERICA, LLC - MD 238      
443-896 6   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2006-10-02   
443-896 7   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2007-08-02   
443-896 8   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2007-01-02   
443-896 9   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238      
443-917 A BLTMMDCH42Z  876D ONVOY, LLC - MD 238      
443-917 0   515J IP HORIZON LLC 238   2013-09-06   
443-917 1   071F BANDWIDTH.COM CLEC, LLC - MD 238   2015-05-14   
443-917 2   318J COMCAST IP PHONE, LLC 238   2013-01-30   
443-917 3   876D ONVOY, LLC - MD 238   2012-02-29   
443-917 4   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238   2013-07-22   
443-917 5   145J TERRA NOVA TELECOM INC. 238   2024-09-11   
443-917 6   071F BANDWIDTH.COM CLEC, LLC - MD 238   2015-05-14   
443-917 7   508J CENTURYLINK COMMUNICATIONS, LLC 238   2013-10-01   
443-917 8   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2015-02-14   
443-917 9   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2015-02-14   
443-979 A BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238      
443-979 0   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2012-01-19   
443-979 1   5562 METROPCS, INC. 238   2013-07-25   
443-979 2   5562 METROPCS, INC. 238   2014-11-22   
443-979 3   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2012-05-01   
443-979 4   5562 METROPCS, INC. 238   2014-12-29   
443-979 5   5562 METROPCS, INC. 238   2014-12-29   
443-979 6   5562 METROPCS, INC. 238   2015-03-06   
443-979 7   318J COMCAST IP PHONE, LLC 238   2014-11-20   
443-979 8   876D ONVOY, LLC - MD 238   2014-10-20   
443-979 9   876D ONVOY, LLC - MD 238   2014-10-20   
667-200 A BLTMMDCH42Z  876D ONVOY, LLC - MD 238      
667-200 0   876D ONVOY, LLC - MD 238   2016-02-18   
667-200 1   876D ONVOY, LLC - MD 238   2016-04-28   
667-200 2   876D ONVOY, LLC - MD 238   2016-04-28   
667-200 3   876D ONVOY, LLC - MD 238   2017-06-18   
667-200 4   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2017-12-22   
667-200 5   318J COMCAST IP PHONE, LLC 238   2016-04-22   
667-200 6   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2016-05-31   
667-200 7   5562 METROPCS, INC. 238   2016-03-05   
667-200 8   5562 METROPCS, INC. 238   2016-03-05   
667-200 9   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2016-05-31   
667-240 A BLTQMD012MD  964H BARR TELL USA, INC. 238      
667-240 0   073H TELNYX LLC 238   2017-03-14   
667-240 1   964H BARR TELL USA, INC. 238   2017-01-21   
667-240 2   318J COMCAST IP PHONE, LLC 238   2017-01-22   
667-240 3   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2017-01-25   
667-240 4   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2017-01-25   
667-240 5   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2017-05-29   
667-240 6   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2017-09-05   
667-240 7   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2018-04-23   
667-240 8   876D ONVOY, LLC - MD 238   2018-05-27   
667-240 9   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2017-09-19   
667-257 A BLTMMDCHXQX  197D VONAGE AMERICA LLC 238      
667-257 0   197D VONAGE AMERICA LLC 238   2018-12-29   
667-257 1   197D VONAGE AMERICA LLC 238   2018-12-29   
667-257 2   197D VONAGE AMERICA LLC 238   2018-12-29   
667-257 3   197D VONAGE AMERICA LLC 238   2018-12-29   
667-257 4   197D VONAGE AMERICA LLC 238   2018-12-30   
667-257 5   876D ONVOY, LLC - MD 238   2022-10-16   

<< 1 2 3 4 5 >>

Last updated: Thu, 01 Jan 2026 03:59:49 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.