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.

Washington Zone 10, MD

<< 1 2 3 4 5 6 7 8 9 10 11 >>

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
240-205 4 WASKDCFNAMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236   2005-12-02   
240-205 5 WASKDCFNAMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236   2005-12-02   
240-205 6 WASKDCFNAMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236   2006-10-02   
240-205 7 MCLNVA23DS4  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 236   2006-01-02   
240-205 8 MCLNVA23DS4  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 236   2006-01-02   
240-205 9 WASKDCFNAMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236   2006-04-01   
240-238 A   829J PAETEC ITEL, LLC 236   2025-04-02   
240-268 A WASKDCFNPS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236      
240-268 0 WASKDCFNPS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236      
240-268 1 WASKDCFNPS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236      
240-268 2 WASKDCFNPS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236      
240-268 3 WASKDCFNPS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236      
240-268 4 WASKDCFNAMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236   2017-09-01   
240-268 5 WASKDCFNPS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236      
240-268 6 WASKDCFNPS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236      
240-268 7 WASKDCFNPS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236      
240-268 8 WASKDCFNPS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236      
240-268 9 BTVLMD12CMA  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236   2022-11-08   
240-276 A GTBGMDGBPS0  9212 VERIZON MARYLAND, INC. 236      
240-276 0 GTBGMDGBPS0  9212 VERIZON MARYLAND, INC. 236   2004-06-25   
240-276 1 GTBGMDGBPS0  9212 VERIZON MARYLAND, INC. 236   2004-06-25   
240-276 2 GTBGMDGBPS0  9212 VERIZON MARYLAND, INC. 236   2004-06-25   
240-276 3 GTBGMDGBPS0  9212 VERIZON MARYLAND, INC. 236   2004-06-25   
240-276 4 GTBGMDGBPS0  9212 VERIZON MARYLAND, INC. 236   2004-06-25   
240-276 5 GTBGMDGBPS0  9212 VERIZON MARYLAND, INC. 236   2004-06-25   
240-276 6 RKVLMDRVDS1  9212 VERIZON MARYLAND, INC. 236   2004-06-25   
240-276 7 RKVLMDRVDS1  9212 VERIZON MARYLAND, INC. 236   2004-06-25   
240-276 8 RKVLMDRVDS1  9212 VERIZON MARYLAND, INC. 236   2004-06-25   
240-276 9 RKVLMDRVDS1  9212 VERIZON MARYLAND, INC. 236   2004-06-25   
240-314 A RKVLMDRVDS1  9212 VERIZON MARYLAND, INC. 236      
240-314 0 RKVLMDRVDS1  9212 VERIZON MARYLAND, INC. 236      
240-314 1 RKVLMDRVDS1  9212 VERIZON MARYLAND, INC. 236      
240-314 2 RKVLMDRVDS1  9212 VERIZON MARYLAND, INC. 236      
240-314 3 RKVLMDRVDS1  9212 VERIZON MARYLAND, INC. 236      
240-314 4 RKVLMDRVDS1  9212 VERIZON MARYLAND, INC. 236      
240-314 5 RKVLMDRVDS1  9212 VERIZON MARYLAND, INC. 236      
240-314 6 RKVLMDRVDS1  9212 VERIZON MARYLAND, INC. 236      
240-314 7 RKVLMDRVDS1  9212 VERIZON MARYLAND, INC. 236      
240-314 8 RKVLMDRVDS1  9212 VERIZON MARYLAND, INC. 236      
240-314 9 BTVLMD12CMA  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236   2007-07-16   
240-328 A RKVLMDRVDS1  9212 VERIZON MARYLAND, INC. 236      
240-328 0 BTVLMD18GT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236   2004-01-13   
240-328 1 RKVLMDRVDS1  9212 VERIZON MARYLAND, INC. 236      
240-328 2 BTVLMD18GT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236   2004-08-21   
240-328 3 BTVLMD18GT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236   2005-07-04   
240-328 4 WASKDCFNAMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236   2005-09-20   
240-328 5 WASKDCFNAMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236   2005-09-20   
240-328 6 ARTNVAARXDY  318J COMCAST IP PHONE, LLC 236   2005-07-25   
240-328 7 BTVLMD18GT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236   2006-03-14   
240-328 8 BTVLMD18GT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236   2005-08-10   
240-328 9 WASKDCFNAMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236   2005-09-20   
240-386 A GTBGMDGBPS0  9212 VERIZON MARYLAND, INC. 236      
240-386 0 BTVLMD12CMA  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236   2021-01-01   
240-386 1   829J PAETEC ITEL, LLC 236   2015-04-15   
240-386 2 GTBGMDGBPS0  9212 VERIZON MARYLAND, INC. 236      
240-386 3 GTBGMDGBPS0  9212 VERIZON MARYLAND, INC. 236      
240-386 4 GTBGMDGBPS0  9212 VERIZON MARYLAND, INC. 236      
240-386 5 GTBGMDGBPS0  9212 VERIZON MARYLAND, INC. 236      
240-386 6 GTBGMDGBPS0  9212 VERIZON MARYLAND, INC. 236      
240-386 7 BTVLMD12CMA  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236   2006-04-29   
240-386 8 ARTNVAARXDY  318J COMCAST IP PHONE, LLC 236   2009-06-13   
240-386 9 BTVLMD12CMA  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236   2007-09-09   
240-399 A WASKDCFNPS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236      
240-401 A BTVLMD18GT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236      
240-403 A   829J PAETEC ITEL, LLC 236   2025-04-02   
240-403 0   829J PAETEC ITEL, LLC 236      
240-403 1   829J PAETEC ITEL, LLC 236      
240-403 2   829J PAETEC ITEL, LLC 236      
240-403 3   829J PAETEC ITEL, LLC 236      
240-403 4   829J PAETEC ITEL, LLC 236      
240-403 5   829J PAETEC ITEL, LLC 236      
240-403 6   829J PAETEC ITEL, LLC 236      
240-403 7 ARTNVAARXDY  318J COMCAST IP PHONE, LLC 236   2008-03-05   
240-403 8   829J PAETEC ITEL, LLC 236      
240-403 9   829J PAETEC ITEL, LLC 236      
240-406 A BTVLMD18GT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236      
240-406 0 BTVLMD18GT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236   2009-11-14   
240-406 1   829J PAETEC ITEL, LLC 236   2010-07-26   
240-406 2 BTVLMD12CMA  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236   2010-09-05   
240-406 3 BTVLMD12CMA  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236   2010-09-05   
240-406 4 WASHDCDP8MD  071F BANDWIDTH.COM CLEC, LLC - MD 236   2010-10-17   
240-406 5 WASHDCDP8MD  071F BANDWIDTH.COM CLEC, LLC - MD 236   2010-10-28   
240-406 6 BTVLMD12CMA  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236   2010-02-11   
240-406 7 WASHDCDP8MD  071F BANDWIDTH.COM CLEC, LLC - MD 236   2010-06-26   
240-406 8 WASHDCDP8MD  071F BANDWIDTH.COM CLEC, LLC - MD 236   2011-01-27   
240-406 9 WASHDCDP8MD  071F BANDWIDTH.COM CLEC, LLC - MD 236   2011-01-27   
240-408 A BTVLMD18GT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236      
240-408 0 BTVLMD18GT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236   2009-12-12   
240-408 1 BTVLMD12CMA  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236   2010-12-03   
240-408 2 BTVLMD12CMA  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236   2010-12-03   
240-408 3   829J PAETEC ITEL, LLC 236   2010-08-11   
240-408 4 WASHDCDP8MD  071F BANDWIDTH.COM CLEC, LLC - MD 236   2010-08-19   
240-408 5 WASHDCDP8MD  071F BANDWIDTH.COM CLEC, LLC - MD 236   2010-08-19   
240-408 6 BTVLMD12CMA  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236   2010-12-03   
240-408 7 WASKDCFNPS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236   2011-03-15   
240-408 8 BTVLMD18G00  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236   2023-08-06   
240-408 9 BTVLMD12CMA  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236   2012-12-10   
240-421 A BTVLMD12CMA  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236      
240-421 0 BTVLMD12CMA  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236      
240-421 1 BTVLMD12CMA  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236      

<< 1 2 3 4 5 6 7 8 9 10 11 >>

Last updated: Sun, 07 Dec 2025 22:02:11 UTC

Sponsored by: VoIP Much Phone Company

Like this site? We accept donations via PayPal.