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 48 >>

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
301-349 4 Poolesville MD PLVLMDPVRS2  9212 VERIZON MARYLAND, INC. 236      
301-349 5 Poolesville MD PLVLMDPVRS2  9212 VERIZON MARYLAND, INC. 236      
301-349 6 Poolesville MD WASHDCDP8MD  071F BANDWIDTH.COM CLEC, LLC - MD 236      
301-349 7 Poolesville MD CHCHMDBE6MD  4716 PAETEC COMMUNICATIONS, INC. - MD 236      
301-349 8 Poolesville MD WASHDC12OMD  4820 CAVALIER EAST, LLC - MD 236      
301-349 9 Poolesville MD   515J IP HORIZON LLC 236      
301-350 A Washington Zone 5 MD CPHGMDCADS0  9212 VERIZON MARYLAND, INC. 236      
301-351 A Washington Zone 3 MD WASKDCFNAMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236      
301-352 A Washington Zone 14 MD BOWIMDBODS0  9212 VERIZON MARYLAND, INC. 236      
301-353 A Washington Zone 10 MD GMTWMDGNDS0  9212 VERIZON MARYLAND, INC. 236      
301-354 A Washington Zone 10 MD WASHDCTTDS0  7529 TELEPORT COMMUNICATIONS AMERICA, LLC - DC 236      
301-354 0 Washington Zone 10 MD WASHDCTTDS0  7529 TELEPORT COMMUNICATIONS AMERICA, LLC - DC 236      
301-354 1 Washington Zone 10 MD WASHDCTTDS0  7529 TELEPORT COMMUNICATIONS AMERICA, LLC - DC 236      
301-354 2 Washington Zone 10 MD WASHDCTTDS0  7529 TELEPORT COMMUNICATIONS AMERICA, LLC - DC 236      
301-354 3 Washington Zone 10 MD WASHDCTTDS0  7529 TELEPORT COMMUNICATIONS AMERICA, LLC - DC 236      
301-354 4 Washington Zone 10 MD WASHDCTTDS0  7529 TELEPORT COMMUNICATIONS AMERICA, LLC - DC 236      
301-354 5 Washington Zone 10 MD WASHDCTTDS0  7529 TELEPORT COMMUNICATIONS AMERICA, LLC - DC 236      
301-354 6 Washington Zone 10 MD WASIDCRG7MD  508J CENTURYLINK COMMUNICATIONS, LLC 236      
301-354 7 Washington Zone 10 MD WASHDCTTDS0  7529 TELEPORT COMMUNICATIONS AMERICA, LLC - DC 236      
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      
301-355 1 Gaithersburg MD WASJDCDCDS0  6050 GLOBAL CROSSING LOCAL SERVICES, INC. - MD 236      
301-355 2 Gaithersburg MD MCLNVA23DS4  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 236      
301-355 3 Gaithersburg MD VINNVACBDS0  876D ONVOY, LLC - MD 236      
301-355 4 Gaithersburg MD ARTNVAARXDY  318J COMCAST IP PHONE, LLC 236      
301-355 5 Gaithersburg MD GTBGMDGBPS0  9212 VERIZON MARYLAND, INC. 236      
301-355 6 Gaithersburg MD GTBGMDGBPS0  9212 VERIZON MARYLAND, INC. 236      
301-355 7 Gaithersburg MD GTBGMDGBPS0  9212 VERIZON MARYLAND, INC. 236      
301-355 8 Gaithersburg MD ARTNVAARXDY  318J COMCAST IP PHONE, LLC 236      
301-355 9 Gaithersburg MD WASLDCRGDS0  281E YMAX COMMUNICATIONS CORP. - MD 236      
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      
301-356 1 Laurel MD WASKDCFNAMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236      
301-356 2 Laurel MD WASKDCFNAMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236      
301-356 3 Laurel MD WASKDCFNAMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236      
301-356 4 Laurel MD WASKDCFNAMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236      
301-356 5 Laurel MD WASKDCFNAMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236      
301-356 6 Laurel MD WASKDCFNAMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236      
301-356 7 Laurel MD WASKDCFNAMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236      
301-356 8 Laurel MD WASKDCFNAMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236      
301-356 9 Laurel MD LARLMDCCDS0  4492 VDL, INC. DBA GLOBAL TELECOM BROKERS - MD 236      
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      
301-357 1 Washington Zone 3 MD BTVLMD12CMA  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236      
301-357 2 Washington Zone 3 MD BTVLMD12CMA  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236      
301-357 3 Washington Zone 3 MD BTVLMD12CMA  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236      
301-357 4 Washington Zone 3 MD BTVLMD12CMA  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236      
301-357 5 Washington Zone 3 MD BTVLMD12CMA  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236      
301-357 6 Washington Zone 3 MD BTVLMD12CMA  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236      
301-357 7 Washington Zone 3 MD BTVLMD12CMA  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236      
301-357 8 Washington Zone 3 MD VINNVACBDS0  876D ONVOY, LLC - MD 236      
301-357 9 Washington Zone 3 MD BTVLMD12CMA  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236      
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      
301-358 4 Washington Zone 15 MD MCLNVA23DS4  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 236      
301-358 5 Washington Zone 15 MD MCLNVA23DS4  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 236      
301-358 6 Washington Zone 15 MD MCLNVA23DS4  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 236      
301-358 7 Washington Zone 15 MD   2593 CORE COMMUNICATIONS, INC.- MD 236      
301-358 8 Washington Zone 15 MD WASHDCSWMMD  624H ONVOY SPECTRUM, LLC 236      
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      
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      
301-359 6 Westernport MD HGTWMDHGDMD  071F BANDWIDTH.COM CLEC, LLC - MD 240      
301-359 7 Westernport MD   2593 CORE COMMUNICATIONS, INC.- MD 240      
301-359 8 Westernport MD FRDRMDFRXAX  7325 TELEPORT COMMUNICATIONS AMERICA, LLC - MD 240      
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      
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      
301-363 1 Damascus (Hagerstown LATA) MD FRDRMDFRXMD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 240      
301-363 2 Damascus (Hagerstown LATA) MD FRDRMDFRXMD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 240      
301-363 3 Damascus (Hagerstown LATA) MD FRDRMDFRXTX  318J COMCAST IP PHONE, LLC 240      
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      
301-363 6 Damascus (Hagerstown LATA) MD FRDRMDFRXPX  624H ONVOY SPECTRUM, LLC 240      
301-363 7 Damascus (Hagerstown LATA) MD HGTWMDHGDMD  071F BANDWIDTH.COM CLEC, LLC - MD 240      
301-363 8 Damascus (Hagerstown LATA) MD FRDRMDFRXTX  318J COMCAST IP PHONE, LLC 240      
301-363 9 Damascus (Hagerstown LATA) MD HGTWMDHGDMD  071F BANDWIDTH.COM CLEC, LLC - MD 240      

<< 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 48 >>

Last updated: Wed, 20 Nov 2024 21:20:06 UTC

Sponsored by: VoIP Much Phone Company

Like this site? We accept donations via PayPal.