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.

Poolesville, MD

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
240-220 A SLSPMD91DS0  568G PEERLESS NETWORK OF MARYLAND, LLC 236      
240-220 0   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236   2021-03-04   
240-220 1   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236   2021-04-19   
240-220 2   876D ONVOY, LLC - MD 236   2021-12-23   
240-220 3   876D ONVOY, LLC - MD 236   2021-07-12   
240-220 4   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236   2022-01-02   
240-220 5   568G PEERLESS NETWORK OF MARYLAND, LLC 236   2022-04-04   
240-220 6   568G PEERLESS NETWORK OF MARYLAND, LLC 236   2021-12-25   
240-220 7   876D ONVOY, LLC - MD 236   2022-04-25   
240-220 8   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236   2022-02-21   
240-220 9   568G PEERLESS NETWORK OF MARYLAND, LLC 236      
240-255 A WASHDC12DS6  568G PEERLESS NETWORK OF MARYLAND, LLC 236      
240-255 0   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236   2022-06-14   
240-255 1   624H ONVOY SPECTRUM, LLC 236   2021-11-15   
240-255 2   624H ONVOY SPECTRUM, LLC 236   2022-03-12   
240-255 3   876D ONVOY, LLC - MD 236   2021-09-24   
240-255 4   624H ONVOY SPECTRUM, LLC 236   2022-03-12   
240-255 5   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236   2024-06-21   
240-255 6   568G PEERLESS NETWORK OF MARYLAND, LLC 236   2021-03-24   
240-255 7   624H ONVOY SPECTRUM, LLC 236   2021-11-15   
240-255 8   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236   2020-10-26   
240-255 9   568G PEERLESS NETWORK OF MARYLAND, LLC 236      
240-489 A WASKDCFNPS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236      
240-489 0   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236      
240-489 1   071F BANDWIDTH.COM CLEC, LLC - MD 236   2011-02-28   
240-489 2   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 236   2006-03-05   
240-489 3   318J COMCAST IP PHONE, LLC 236   2005-07-25   
240-489 4   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236   2005-08-15   
240-489 5   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236   2005-08-15   
240-489 6   145J TERRA NOVA TELECOM INC. 236   2024-07-16   
240-489 8   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236   2005-08-15   
240-489 9   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236      
240-771 A VINNVACBDS0  876D ONVOY, LLC - MD 236      
240-771 0   876D ONVOY, LLC - MD 236   2016-04-18   
240-771 1   876D ONVOY, LLC - MD 236   2016-04-18   
240-771 2   2593 CORE COMMUNICATIONS, INC.- MD 236   2018-07-01   
240-771 3   876D ONVOY, LLC - MD 236   2016-08-05   
240-771 4   876D ONVOY, LLC - MD 236   2016-08-05   
240-771 5   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236   2018-02-02   
240-771 6   2593 CORE COMMUNICATIONS, INC.- MD 236   2018-07-01   
240-771 7   2593 CORE COMMUNICATIONS, INC.- MD 236   2018-07-01   
240-771 8   073H TELNYX LLC 236   2017-04-27   
240-771 9   515J IP HORIZON LLC 236   2016-05-31   
240-812 A   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 236      
240-812 1   071F BANDWIDTH.COM CLEC, LLC - MD 236   2011-04-04   
240-812 2   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236   2007-01-13   
240-812 4   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 236      
240-812 5   624H ONVOY SPECTRUM, LLC 236   2021-05-21   
240-812 6   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236   2009-03-02   
240-812 7   071F BANDWIDTH.COM CLEC, LLC - MD 236   2010-02-25   
240-812 8   071F BANDWIDTH.COM CLEC, LLC - MD 236   2007-10-22   
240-812 9   071F BANDWIDTH.COM CLEC, LLC - MD 236   2008-12-13   
240-961 A WASKDCFNAMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236      
240-961 0   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236   2022-11-06   
240-961 1   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236   2023-11-29   
240-961 2   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236   2025-03-13   
240-961 3   568G PEERLESS NETWORK OF MARYLAND, LLC 236   2022-11-07   
240-961 4   876D ONVOY, LLC - MD 236   2022-12-01   
240-961 5   876D ONVOY, LLC - MD 236   2022-12-01   
240-961 7   318J COMCAST IP PHONE, LLC 236   2023-02-21   
240-961 8   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236   2023-05-25   
240-961 9   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236   2025-09-25   
301-349 A PLVLMDPVRS2  9212 VERIZON MARYLAND, INC. 236      
301-349 0   9212 VERIZON MARYLAND, INC. 236      
301-349 1   568G PEERLESS NETWORK OF MARYLAND, LLC 236   2013-05-03   
301-349 2   9212 VERIZON MARYLAND, INC. 236      
301-349 3   876D ONVOY, LLC - MD 236   2016-03-01   
301-349 4   9212 VERIZON MARYLAND, INC. 236      
301-349 5   9212 VERIZON MARYLAND, INC. 236      
301-349 6   071F BANDWIDTH.COM CLEC, LLC - MD 236   2010-08-19   
301-349 7   829J PAETEC ITEL, LLC 236   2007-04-15   
301-349 8   829J PAETEC ITEL, LLC 236   2011-01-28   
301-349 9   515J IP HORIZON LLC 236   2015-03-21   
301-691 A WASHDCTTDS0  7529 TELEPORT COMMUNICATIONS AMERICA, LLC - DC 236      
301-691 0   2593 CORE COMMUNICATIONS, INC.- MD 236   2004-03-26   
301-691 1   829J PAETEC ITEL, LLC 236   2004-02-04   
301-691 2   876D ONVOY, LLC - MD 236   2015-10-09   
301-691 3   876D ONVOY, LLC - MD 236   2012-10-07   
301-691 4   876D ONVOY, LLC - MD 236   2015-06-27   
301-691 5   568G PEERLESS NETWORK OF MARYLAND, LLC 236   2013-05-03   
301-691 6   8697 BALTIMORE-WASHINGTON TELEPHONE (BWT) 236   2015-06-20   
301-691 7   508J CENTURYLINK COMMUNICATIONS, LLC 236   2014-06-12   
301-691 8   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236   2015-02-18   
301-691 9   7529 TELEPORT COMMUNICATIONS AMERICA, LLC - DC 236      

Last updated: Tue, 13 Jan 2026 21:50:02 UTC

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.