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.

Waldorf, MD

<< 1 2 3 4 5 >>

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
240-640 8   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236   2009-06-23   
240-640 9   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236   2010-01-03   
240-682 A LNHMMDADGT0  8832 STARPOWER COMMUNICATIONS, LLC - MD 236      
240-682 0   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236   2003-11-03   
240-682 1   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236   2004-02-17   
240-682 2   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236   2003-08-19   
240-682 3   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236   2004-08-02   
240-682 4   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236   2004-09-29   
240-682 5   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236   2004-12-02   
240-682 6   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236   2005-03-04   
240-682 7   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236   2005-04-01   
240-682 8   8832 STARPOWER COMMUNICATIONS, LLC - MD 236      
240-682 9   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236   2005-05-02   
240-754 A MCLNVA23DS4  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 236      
240-754 0   2593 CORE COMMUNICATIONS, INC.- MD 236   2018-10-23   
240-754 1   2593 CORE COMMUNICATIONS, INC.- MD 236   2018-10-23   
240-754 2   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 236   2012-01-02   
240-754 3   876D ONVOY, LLC - MD 236   2021-01-03   
240-754 4   876D ONVOY, LLC - MD 236   2015-06-27   
240-754 5   829J PAETEC ITEL, LLC 236   2012-04-03   
240-754 6   829J PAETEC ITEL, LLC 236   2012-04-03   
240-754 7   318J COMCAST IP PHONE, LLC 236   2013-09-05   
240-754 8   2593 CORE COMMUNICATIONS, INC.- MD 236   2018-10-23   
240-754 9   2593 CORE COMMUNICATIONS, INC.- MD 236   2018-10-23   
301-266 A BTVLMD18GT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236      
301-374 A WDRFMDWDDS0  9212 VERIZON MARYLAND, INC. 236      
301-374 0   9212 VERIZON MARYLAND, INC. 236      
301-374 1   9212 VERIZON MARYLAND, INC. 236      
301-374 2   9212 VERIZON MARYLAND, INC. 236      
301-374 3   2593 CORE COMMUNICATIONS, INC.- MD 236   2019-04-29   
301-374 4   2593 CORE COMMUNICATIONS, INC.- MD 236   2019-04-29   
301-374 5   9212 VERIZON MARYLAND, INC. 236      
301-374 6   9212 VERIZON MARYLAND, INC. 236      
301-374 7   2593 CORE COMMUNICATIONS, INC.- MD 236   2019-04-29   
301-374 8   318J COMCAST IP PHONE, LLC 236   2017-05-22   
301-374 9   9212 VERIZON MARYLAND, INC. 236      
301-396 A WDRFMDWDDS0  9212 VERIZON MARYLAND, INC. 236      
301-396 0   9212 VERIZON MARYLAND, INC. 236      
301-396 1   9212 VERIZON MARYLAND, INC. 236      
301-396 2   318J COMCAST IP PHONE, LLC 236   2019-03-20   
301-396 3   9212 VERIZON MARYLAND, INC. 236      
301-396 4   9212 VERIZON MARYLAND, INC. 236      
301-396 5   9212 VERIZON MARYLAND, INC. 236      
301-396 6   2593 CORE COMMUNICATIONS, INC.- MD 236   2019-04-29   
301-396 7   876D ONVOY, LLC - MD 236   2019-02-19   
301-396 8   9212 VERIZON MARYLAND, INC. 236      
301-396 9   9212 VERIZON MARYLAND, INC. 236      
301-399 A BTVLMD12CMA  5562 METROPCS, INC. 236      
301-399 0   5562 METROPCS, INC. 236      
301-399 1   5562 METROPCS, INC. 236      
301-399 2   5562 METROPCS, INC. 236      
301-399 3   5562 METROPCS, INC. 236      
301-399 4   5562 METROPCS, INC. 236      
301-399 5   5562 METROPCS, INC. 236      
301-399 6   5562 METROPCS, INC. 236      
301-399 7   5562 METROPCS, INC. 236      
301-399 8   5562 METROPCS, INC. 236      
301-399 9   5562 METROPCS, INC. 236      
301-535 A BTVLMD18GT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236      
301-542 A WASHDCTTDS0  7529 TELEPORT COMMUNICATIONS AMERICA, LLC - DC 236      
301-542 0   7529 TELEPORT COMMUNICATIONS AMERICA, LLC - DC 236      
301-542 1   829J PAETEC ITEL, LLC 236   2006-01-20   
301-542 2   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236   2006-04-24   
301-542 3   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236   2006-06-02   
301-542 4   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236   2006-07-03   
301-542 5   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236   2011-06-27   
301-542 6   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236   2007-11-15   
301-542 7   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236   2006-06-02   
301-542 8   829J PAETEC ITEL, LLC 236   2004-03-27   
301-542 9   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236   2006-08-07   
301-553 A SLSPMDSSX6X  6630 USA MOBILITY WIRELESS, INC. 236      
301-597 A BTVLMD18GT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236      
301-597 0   624H ONVOY SPECTRUM, LLC 236   2022-03-11   
301-597 1   876D ONVOY, LLC - MD 236   2022-04-25   
301-597 2   624H ONVOY SPECTRUM, LLC 236   2022-03-21   
301-597 3   624H ONVOY SPECTRUM, LLC 236   2022-03-21   
301-597 4   876D ONVOY, LLC - MD 236   2022-04-25   
301-597 5   624H ONVOY SPECTRUM, LLC 236   2022-03-11   
301-597 6   624H ONVOY SPECTRUM, LLC 236   2022-03-11   
301-597 7   876D ONVOY, LLC - MD 236   2022-04-25   
301-597 8   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236   2022-03-10   
301-597 9   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236   2022-03-10   
301-609 A LPLTMDLADS0  9212 VERIZON MARYLAND, INC. 236      
301-609 0   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236   2007-02-02   
301-609 1   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236   2007-02-02   
301-609 2   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236   2007-03-05   
301-609 3   9212 VERIZON MARYLAND, INC. 236      
301-609 4   9212 VERIZON MARYLAND, INC. 236      
301-609 5   9212 VERIZON MARYLAND, INC. 236      
301-609 6   9212 VERIZON MARYLAND, INC. 236      
301-609 7   9212 VERIZON MARYLAND, INC. 236      
301-609 8   9212 VERIZON MARYLAND, INC. 236      
301-609 9   9212 VERIZON MARYLAND, INC. 236      
301-632 A WDRFMDWDDS0  9212 VERIZON MARYLAND, INC. 236      
301-632 0   2593 CORE COMMUNICATIONS, INC.- MD 236   2018-10-23   
301-632 1   2593 CORE COMMUNICATIONS, INC.- MD 236   2018-10-23   
301-632 2   9212 VERIZON MARYLAND, INC. 236      
301-632 3   9212 VERIZON MARYLAND, INC. 236      
301-632 4   9212 VERIZON MARYLAND, INC. 236      
301-632 5   9212 VERIZON MARYLAND, INC. 236      

<< 1 2 3 4 5 >>

Last updated: Thu, 29 Jan 2026 14:35:03 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.