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
443-542 5   829J PAETEC ITEL, LLC 238   2004-06-25   
443-542 6 CLMAMDSRRS0  9212 VERIZON MARYLAND, INC. 238   2004-12-20   
443-542 7 BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2007-02-02   
443-542 8 BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2007-09-01   
443-542 9 BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238   2007-01-19   
443-545 A BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238      
443-545 0 BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2021-09-25   
443-545 1 BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238      
443-545 2 BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238      
443-545 3 BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238      
443-545 4 BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2008-04-04   
443-545 5 BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238   2006-06-03   
443-545 6 BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2008-08-01   
443-545 7 BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2016-03-03   
443-545 8 BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2016-09-19   
443-545 9 BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2008-10-03   
443-546 A CLMAMDCBRP0  9212 VERIZON MARYLAND, INC. 238      
443-546 0 BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2011-02-03   
443-546 1 CLMAMDCBRP0  9212 VERIZON MARYLAND, INC. 238      
443-546 2 BLTOMDKHDS0  7228 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 238   2007-08-24   
443-546 3 BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238   2006-09-15   
443-546 4 BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238   2006-09-15   
443-546 5 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2010-07-11   
443-546 6 BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2010-06-22   
443-546 7 BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2010-08-01   
443-546 8 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2008-10-10   
443-546 9 BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2008-04-24   
443-583 A   829J PAETEC ITEL, LLC 238   2025-04-01   
443-583 0 BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2016-03-03   
443-583 1   829J PAETEC ITEL, LLC 238      
443-583 2 BLTMMD91DS2  2596 QUANTUM TELECOMMUNICATIONS, INC. - MD 238   2016-01-31   
443-583 3 BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2014-03-31   
443-583 4 BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2014-03-31   
443-583 5 BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2014-09-01   
443-583 6 BLTMMDCH40Z  5562 METROPCS, INC. 238   2015-05-29   
443-583 7 BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238   2014-09-16   
443-583 8 BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2015-05-14   
443-583 9 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2014-11-08   
443-656 A   829J PAETEC ITEL, LLC 238   2025-04-01   
443-656 0   829J PAETEC ITEL, LLC 238      
443-656 1 BLTMMDCHXUX  624H ONVOY SPECTRUM, LLC 238   2021-05-22   
443-656 2 CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2025-01-08   
443-656 3   829J PAETEC ITEL, LLC 238      
443-656 4   829J PAETEC ITEL, LLC 238      
443-656 5 CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2025-01-08   
443-656 6   829J PAETEC ITEL, LLC 238      
443-656 7   829J PAETEC ITEL, LLC 238      
443-656 8   829J PAETEC ITEL, LLC 238      
443-656 9 BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2021-07-11   
443-718 A   829J PAETEC ITEL, LLC 238   2025-04-01   
443-718 0 BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2010-02-19   
443-718 1 BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2009-07-12   
443-718 2   829J PAETEC ITEL, LLC 238   2008-05-10   
443-718 3   829J PAETEC ITEL, LLC 238   2008-05-10   
443-718 4   829J PAETEC ITEL, LLC 238   2008-06-16   
443-718 5   829J PAETEC ITEL, LLC 238   2008-06-16   
443-718 6   829J PAETEC ITEL, LLC 238   2008-09-25   
443-718 7 BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2009-07-12   
443-718 8 BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2010-04-02   
443-718 9 BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2008-12-11   
443-741 A BLTOMDKHDS0  7228 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 238      
443-741 0 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2011-08-08   
443-741 1 BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2011-05-20   
443-741 2 BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2011-08-20   
443-741 3 BLTOMDKHDS0  7228 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 238   2011-05-13   
443-741 4 BLTOMDKHDS0  7228 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 238   2012-05-05   
443-741 5 BLTMMDCH40Z  5562 METROPCS, INC. 238   2013-06-14   
443-741 6 BLTMMDCH40Z  5562 METROPCS, INC. 238   2013-06-14   
443-741 7 BLTMMDCH40Z  5562 METROPCS, INC. 238   2014-08-01   
443-741 8 BLTQMD01DS0  568G PEERLESS NETWORK OF MARYLAND, LLC 238   2013-05-04   
443-741 9 BLTQMD01DS0  568G PEERLESS NETWORK OF MARYLAND, LLC 238   2013-05-04   
443-745 A BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238      
443-766 A   829J PAETEC ITEL, LLC 238   2025-04-01   
443-766 0 BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2007-12-14   
443-766 1   829J PAETEC ITEL, LLC 238   2005-07-09   
443-766 2 CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2016-08-03   
443-766 3 CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2016-08-03   
443-766 4 BLTMMDCH40Z  5562 METROPCS, INC. 238   2015-10-01   
443-766 5 BLTMMDCH40Z  5562 METROPCS, INC. 238   2015-09-03   
443-766 6 BLTMMDCH40Z  5562 METROPCS, INC. 238   2015-11-03   
443-766 7   829J PAETEC ITEL, LLC 238   2006-07-15   
443-766 8 BLTMMDCH40Z  5562 METROPCS, INC. 238   2015-10-30   
443-766 9 BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2008-01-14   
443-774 A CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238      
443-774 0 BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2019-04-27   
443-774 1 BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2019-04-27   
443-774 2   2593 CORE COMMUNICATIONS, INC.- MD 238   2019-03-28   
443-774 3   2593 CORE COMMUNICATIONS, INC.- MD 238   2019-03-28   
443-774 4 CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2019-10-07   
443-774 5 CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2019-07-20   
443-774 6   2593 CORE COMMUNICATIONS, INC.- MD 238   2019-03-28   
443-774 7   2593 CORE COMMUNICATIONS, INC.- MD 238   2019-03-28   
443-774 8 CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2019-04-19   
443-774 9 CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2019-01-19   
443-812 A BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238      
443-812 0 BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238      
443-812 1 BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238      
443-812 2 BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238      
443-812 3 BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238      
443-812 4 BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238      

<< 1 2 3 4 5 >>

Last updated: Thu, 16 Oct 2025 03:04:18 UTC

Sponsored by: BeeVox - Whitelabel Reseller Platform

Like this site? We accept donations via PayPal.