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.

NPA: 301 [Rate centres in NPA 301] [Dial plan for NPA 301]

<< 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 >>

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
301-354 8 Washington Zone 10 MD WASHDCTTDS0  7529 TELEPORT COMMUNICATIONS AMERICA, LLC - DC 236      
301-354 9 Washington Zone 10 MD WASHDCTTDS0  7529 TELEPORT COMMUNICATIONS AMERICA, LLC - DC 236      
301-355 A Gaithersburg MD GTBGMDGBPS0  9212 VERIZON MARYLAND, INC. 236      
301-355 0 Gaithersburg MD MCLNVA23DS4  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 236   2009-10-12   
301-355 1 Gaithersburg MD WASJDCDCDS0  6050 GLOBAL CROSSING LOCAL SERVICES, INC. - MD 236   2009-11-30   
301-355 2 Gaithersburg MD MCLNVA23DS4  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 236   2011-01-22   
301-355 3 Gaithersburg MD VINNVACBDS0  876D ONVOY, LLC - MD 236   2008-10-05   
301-355 4 Gaithersburg MD ARTNVAARXDY  318J COMCAST IP PHONE, LLC 236   2009-08-28   
301-355 5 Gaithersburg MD GTBGMDGBPS0  9212 VERIZON MARYLAND, INC. 236   2007-09-04   
301-355 6 Gaithersburg MD GTBGMDGBPS0  9212 VERIZON MARYLAND, INC. 236   2007-09-04   
301-355 7 Gaithersburg MD GTBGMDGBPS0  9212 VERIZON MARYLAND, INC. 236   2007-09-04   
301-355 8 Gaithersburg MD ARTNVAARXDY  318J COMCAST IP PHONE, LLC 236   2009-08-28   
301-355 9 Gaithersburg MD WASLDCRGDS0  281E YMAX COMMUNICATIONS CORP. - MD 236   2011-02-02   
301-356 A Laurel MD LARLMDCCDS0  4492 VDL, INC. DBA GLOBAL TELECOM BROKERS - MD 236      
301-356 0 Laurel MD WASKDCFNAMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236   2005-05-02   
301-356 1 Laurel MD WASKDCFNAMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236   2005-05-02   
301-356 2 Laurel MD WASKDCFNAMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236   2005-05-02   
301-356 3 Laurel MD WASKDCFNAMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236   2005-05-02   
301-356 4 Laurel MD WASKDCFNAMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236   2005-05-02   
301-356 5 Laurel MD WASKDCFNAMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236   2005-05-02   
301-356 6 Laurel MD WASKDCFNAMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236   2005-02-03   
301-356 7 Laurel MD WASKDCFNAMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236   2005-02-03   
301-356 8 Laurel MD WASKDCFNAMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236   2005-08-01   
301-356 9 Laurel MD LARLMDCCDS0  4492 VDL, INC. DBA GLOBAL TELECOM BROKERS - MD 236   2004-04-05   
301-357 A Washington Zone 3 MD WASKDCFNAMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236      
301-357 0 Washington Zone 3 MD WASKDCFNAMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236   2006-12-07   
301-357 1 Washington Zone 3 MD BTVLMD12CMA  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236   2007-09-04   
301-357 2 Washington Zone 3 MD BTVLMD12CMA  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236   2007-09-04   
301-357 3 Washington Zone 3 MD BTVLMD12CMA  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236   2007-09-04   
301-357 4 Washington Zone 3 MD BTVLMD12CMA  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236   2007-09-04   
301-357 5 Washington Zone 3 MD BTVLMD12CMA  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236   2007-09-04   
301-357 6 Washington Zone 3 MD BTVLMD12CMA  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236   2007-09-04   
301-357 7 Washington Zone 3 MD BTVLMD12CMA  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236   2007-09-04   
301-357 8 Washington Zone 3 MD VINNVACBDS0  876D ONVOY, LLC - MD 236   2007-09-13   
301-357 9 Washington Zone 3 MD BTVLMD12CMA  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236   2007-09-04   
301-358 A Washington Zone 15 MD MCLNVA23DS4  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 236      
301-358 0 Washington Zone 15 MD MCLNVA23DS4  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 236      
301-358 1 Washington Zone 15 MD MCLNVA23DS4  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 236      
301-358 2 Washington Zone 15 MD MCLNVA23DS4  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 236      
301-358 3 Washington Zone 15 MD MCLNVA23DS4  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 236   2005-01-04   
301-358 4 Washington Zone 15 MD MCLNVA23DS4  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 236   2003-03-24   
301-358 5 Washington Zone 15 MD MCLNVA23DS4  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 236   2005-01-04   
301-358 6 Washington Zone 15 MD MCLNVA23DS4  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 236   2006-09-29   
301-358 7 Washington Zone 15 MD   2593 CORE COMMUNICATIONS, INC.- MD 236   2019-04-29   
301-358 8 Washington Zone 15 MD WASHDCSWMMD  624H ONVOY SPECTRUM, LLC 236   2021-11-08   
301-358 9 Washington Zone 15 MD MCLNVA23DS4  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 236      
301-359 A Westernport MD CMLDMDCMDS0  9212 VERIZON MARYLAND, INC. 240      
301-359 0 Westernport MD CMLDMDCMDS0  9212 VERIZON MARYLAND, INC. 240      
301-359 1 Westernport MD HGTWMDHGDMD  071F BANDWIDTH.COM CLEC, LLC - MD 240   2015-03-01   
301-359 2 Westernport MD CMLDMDCMDS0  9212 VERIZON MARYLAND, INC. 240      
301-359 3 Westernport MD CMLDMDCMDS0  9212 VERIZON MARYLAND, INC. 240      
301-359 4 Westernport MD CMLDMDCMDS0  9212 VERIZON MARYLAND, INC. 240      
301-359 5 Westernport MD FRDRMDFRXTX  318J COMCAST IP PHONE, LLC 240   2010-03-05   
301-359 6 Westernport MD HGTWMDHGDMD  071F BANDWIDTH.COM CLEC, LLC - MD 240   2012-02-10   
301-359 7 Westernport MD   2593 CORE COMMUNICATIONS, INC.- MD 240   2004-03-28   
301-359 8 Westernport MD FRDRMDFRXAX  7325 TELEPORT COMMUNICATIONS AMERICA, LLC - MD 240   2015-03-20   
301-359 9 Westernport MD CMLDMDCMDS0  9212 VERIZON MARYLAND, INC. 240      
301-360 A Frederick MD FRDRMDFRDS1  9212 VERIZON MARYLAND, INC. 240      
301-360 0 Frederick MD FRDRMDFRDS1  9212 VERIZON MARYLAND, INC. 240      
301-360 1 Frederick MD FRDRMDFRDS1  9212 VERIZON MARYLAND, INC. 240      
301-360 2 Frederick MD FRDRMDFRDS1  9212 VERIZON MARYLAND, INC. 240      
301-360 3 Frederick MD FRDRMDFRDS1  9212 VERIZON MARYLAND, INC. 240      
301-360 4 Frederick MD FRDRMDFRDS1  9212 VERIZON MARYLAND, INC. 240      
301-360 5 Frederick MD FRDRMDFRXTX  318J COMCAST IP PHONE, LLC 240   2016-02-09   
301-360 6 Frederick MD FRDRMDFRDS1  9212 VERIZON MARYLAND, INC. 240      
301-360 7 Frederick MD FRDRMDFRDS1  9212 VERIZON MARYLAND, INC. 240      
301-360 8 Frederick MD FRDRMDFRDS1  9212 VERIZON MARYLAND, INC. 240      
301-360 9 Frederick MD FRDRMDFRDS1  9212 VERIZON MARYLAND, INC. 240      
301-361 A Washington Zone 4 MD LARLMDCC5MD  7591 LEVEL 3 TELECOM OF MARYLAND, LLC - MD 236      
301-362 A Laurel MD LARLMDLRDS0  9212 VERIZON MARYLAND, INC. 236      
301-363 A Damascus (Hagerstown LATA) MD FRDRMDFRXMD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 240      
301-363 0 Damascus (Hagerstown LATA) MD HGTWMDHGDMD  071F BANDWIDTH.COM CLEC, LLC - MD 240   2015-10-29   
301-363 1 Damascus (Hagerstown LATA) MD FRDRMDFRXMD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 240   2008-11-26   
301-363 2 Damascus (Hagerstown LATA) MD FRDRMDFRXMD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 240   2011-10-29   
301-363 3 Damascus (Hagerstown LATA) MD FRDRMDFRXTX  318J COMCAST IP PHONE, LLC 240   2012-11-25   
301-363 4 Damascus (Hagerstown LATA) MD FRDRMDFRXMD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 240      
301-363 5 Damascus (Hagerstown LATA) MD FRDRMDFRXTX  318J COMCAST IP PHONE, LLC 240   2009-03-06   
301-363 6 Damascus (Hagerstown LATA) MD FRDRMDFRXPX  624H ONVOY SPECTRUM, LLC 240   2021-12-09   
301-363 7 Damascus (Hagerstown LATA) MD HGTWMDHGDMD  071F BANDWIDTH.COM CLEC, LLC - MD 240   2011-11-25   
301-363 8 Damascus (Hagerstown LATA) MD FRDRMDFRXTX  318J COMCAST IP PHONE, LLC 240   2007-04-07   
301-363 9 Damascus (Hagerstown LATA) MD HGTWMDHGDMD  071F BANDWIDTH.COM CLEC, LLC - MD 240   2013-07-26   
301-364 A Washington Zone 4 MD WASKDCFNPS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236      
301-364 0 Washington Zone 4 MD VINNVACBDS0  876D ONVOY, LLC - MD 236   2012-06-20   
301-364 1 Washington Zone 4 MD WASKDCFNPS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236      
301-364 2 Washington Zone 4 MD BTVLMD12CMA  5562 METROPCS, INC. 236   2013-06-03   
301-364 3 Washington Zone 4 MD VINNVACBDS0  876D ONVOY, LLC - MD 236   2008-10-05   
301-364 4 Washington Zone 4 MD WASHDCDP8MD  071F BANDWIDTH.COM CLEC, LLC - MD 236   2011-10-14   
301-364 5 Washington Zone 4 MD CHCHMDBE6MD  4716 PAETEC COMMUNICATIONS, INC. - MD 236   2005-12-07   
301-364 6 Washington Zone 4 MD BTVLMD12CMA  5562 METROPCS, INC. 236   2013-06-03   
301-364 7 Washington Zone 4 MD BTVLMD12CMA  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236   2008-07-14   
301-364 8 Washington Zone 4 MD BTVLMD12CMA  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236   2008-07-14   
301-364 9 Washington Zone 4 MD SLSPMD91DS0  568G PEERLESS NETWORK OF MARYLAND, LLC 236   2013-05-03   
301-365 A Washington Zone 2 MD BTHSMDBDDS0  9212 VERIZON MARYLAND, INC. 236      
301-366 A Gaithersburg MD BTVLMD12CMA  5562 METROPCS, INC. 236      
301-366 0 Gaithersburg MD ARTNVAARXDY  318J COMCAST IP PHONE, LLC 236   2013-09-12   
301-366 1 Gaithersburg MD BTVLMD18GT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236   2010-06-17   
301-366 2 Gaithersburg MD BTVLMD18GT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236   2010-06-17   
301-366 3 Gaithersburg MD BTVLMD12CMA  5562 METROPCS, INC. 236   2003-10-11   
301-366 4 Gaithersburg MD BTVLMD12CMA  5562 METROPCS, INC. 236   2003-10-11   
301-366 5 Gaithersburg MD BTVLMD12CMA  5562 METROPCS, INC. 236   2004-10-03   

<< 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 >>

Last updated: Sun, 26 Jan 2025 15:59:20 UTC

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.