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
301-378 4 Frederick MD FRDRMDFRKMD  5562 METROPCS, INC. 240   2011-07-08   
301-378 5 Frederick MD FRDRMDFRKMD  5562 METROPCS, INC. 240   2022-11-07   
301-378 6 Frederick MD   145J TERRA NOVA TELECOM INC. 240   2022-11-07   
301-378 7 Frederick MD FRDRMDFRXAX  7325 TELEPORT COMMUNICATIONS AMERICA, LLC - MD 240   2012-09-10   
301-378 8 Frederick MD FRDRMDFRXTX  318J COMCAST IP PHONE, LLC 240   2012-11-03   
301-378 9 Frederick MD FRDRMDFRXTX  318J COMCAST IP PHONE, LLC 240   2013-05-12   
301-379 A Washington Zone 3 MD BTVLMD12CMA  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236      
301-379 0 Washington Zone 3 MD BTVLMD12CMA  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236      
301-379 1 Washington Zone 3 MD BTVLMD12CMA  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236      
301-379 2 Washington Zone 3 MD BTVLMD12CMA  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236      
301-379 3 Washington Zone 3 MD BTVLMD12CMA  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236      
301-379 4 Washington Zone 3 MD BTVLMD12CMA  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236      
301-379 5 Washington Zone 3 MD BTVLMD12CMA  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236      
301-379 6 Washington Zone 3 MD BTVLMD12CMA  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236      
301-379 7 Washington Zone 3 MD BTVLMD12CMA  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236      
301-379 8 Washington Zone 3 MD BTVLMD12CMA  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236      
301-379 9 Washington Zone 3 MD BTVLMD12CMA  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236      
301-380 A Washington Zone 2 MD BTHSMDWWDS0  9212 VERIZON MARYLAND, INC. 236      
301-381 A Washington Zone 2 MD VINNVACBDS0  876D ONVOY, LLC - MD 236      
301-381 0 Washington Zone 2 MD VINNVACBDS0  876D ONVOY, LLC - MD 236   2022-09-16   
301-381 1 Washington Zone 2 MD VINNVACBDS0  876D ONVOY, LLC - MD 236   2022-09-16   
301-381 2 Washington Zone 2 MD VINNVACBDS0  876D ONVOY, LLC - MD 236   2022-09-16   
301-381 3 Washington Zone 2 MD VINNVACBDS0  876D ONVOY, LLC - MD 236   2022-09-16   
301-381 4 Washington Zone 2 MD VINNVACBDS0  876D ONVOY, LLC - MD 236   2022-09-16   
301-381 5 Washington Zone 2 MD VINNVACBDS0  876D ONVOY, LLC - MD 236   2022-09-16   
301-381 6 Washington Zone 2 MD VINNVACBDS0  876D ONVOY, LLC - MD 236   2022-09-16   
301-381 7 Washington Zone 2 MD VINNVACBDS0  876D ONVOY, LLC - MD 236   2022-09-16   
301-381 8 Washington Zone 2 MD VINNVACBDS0  876D ONVOY, LLC - MD 236   2022-09-16   
301-381 9 Washington Zone 2 MD VINNVACBDS0  876D ONVOY, LLC - MD 236   2022-09-16   
301-382 A Washington Zone 11 MD RKVLMDMRDS0  9212 VERIZON MARYLAND, INC. 236      
301-383 A Washington Zone 14 MD ARTNVAARXDY  318J COMCAST IP PHONE, LLC 236      
301-383 0 Washington Zone 14 MD ARTNVAARXDY  318J COMCAST IP PHONE, LLC 236   2012-11-03   
301-383 1 Washington Zone 14 MD ARTNVAARXDY  318J COMCAST IP PHONE, LLC 236      
301-383 2 Washington Zone 14 MD ARTNVAARXDY  318J COMCAST IP PHONE, LLC 236   2016-07-12   
301-383 3 Washington Zone 14 MD BTVLMD12CMA  5562 METROPCS, INC. 236   2016-09-26   
301-383 4 Washington Zone 14 MD BTVLMD12CMA  5562 METROPCS, INC. 236   2017-03-25   
301-383 5 Washington Zone 14 MD BTVLMD12CMA  5562 METROPCS, INC. 236   2016-11-25   
301-383 6 Washington Zone 14 MD BTVLMD12CMA  5562 METROPCS, INC. 236   2017-07-14   
301-383 7 Washington Zone 14 MD BTVLMD12CMA  5562 METROPCS, INC. 236   2017-11-22   
301-383 8 Washington Zone 14 MD SLSPMD91DS0  568G PEERLESS NETWORK OF MARYLAND, LLC 236   2013-05-03   
301-383 9 Washington Zone 14 MD SLSPMD91DS0  568G PEERLESS NETWORK OF MARYLAND, LLC 236   2013-05-03   
301-384 A Washington Zone 12 MD SLSPMDCVDS0  9212 VERIZON MARYLAND, INC. 236      
301-385 A Washington Zone 2 MD BTVLMD18GT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236      
301-386 A Washington Zone 4 MD LDVRMDLODS0  9212 VERIZON MARYLAND, INC. 236      
301-387 A Oakland MD THVLMDTVRS0  9212 VERIZON MARYLAND, INC. 240      
301-387 0 Oakland MD THVLMDTVRS0  9212 VERIZON MARYLAND, INC. 240      
301-387 1 Oakland MD FRDRMDFRXSX  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 240   2024-09-13   
301-387 2 Oakland MD THVLMDTVRS0  9212 VERIZON MARYLAND, INC. 240      
301-387 3 Oakland MD THVLMDTVRS0  9212 VERIZON MARYLAND, INC. 240      
301-387 4 Oakland MD THVLMDTVRS0  9212 VERIZON MARYLAND, INC. 240      
301-387 5 Oakland MD THVLMDTVRS0  9212 VERIZON MARYLAND, INC. 240      
301-387 6 Oakland MD THVLMDTVRS0  9212 VERIZON MARYLAND, INC. 240      
301-387 7 Oakland MD THVLMDTVRS0  9212 VERIZON MARYLAND, INC. 240      
301-387 8 Oakland MD THVLMDTVRS0  9212 VERIZON MARYLAND, INC. 240      
301-387 9 Oakland MD THVLMDTVRS0  9212 VERIZON MARYLAND, INC. 240      
301-388 A Washington Zone 12 MD SLSPMDCVDS0  9212 VERIZON MARYLAND, INC. 236      
301-388 0 Washington Zone 12 MD SLSPMDCVDS0  9212 VERIZON MARYLAND, INC. 236      
301-388 1 Washington Zone 12 MD SLSPMDCVDS0  9212 VERIZON MARYLAND, INC. 236      
301-388 2 Washington Zone 12 MD SLSPMDCVDS0  9212 VERIZON MARYLAND, INC. 236      
301-388 3 Washington Zone 12 MD SLSPMDCVDS0  9212 VERIZON MARYLAND, INC. 236      
301-388 4 Washington Zone 12 MD SLSPMDCVDS0  9212 VERIZON MARYLAND, INC. 236      
301-388 5 Washington Zone 12 MD WASHDCDP8MD  071F BANDWIDTH.COM CLEC, LLC - MD 236   2014-06-06   
301-388 6 Washington Zone 12 MD BTVLMD12CMA  5562 METROPCS, INC. 236   2013-07-25   
301-388 7 Washington Zone 12 MD WASHDCMTX7X  2697 CTC COMMUNICATIONS CORP. - MD 236   2008-04-11   
301-388 8 Washington Zone 12 MD WASHDCDP8MD  071F BANDWIDTH.COM CLEC, LLC - MD 236   2011-05-20   
301-388 9 Washington Zone 12 MD SLSPMDCVDS0  9212 VERIZON MARYLAND, INC. 236      
301-389 A Washington Zone 13 MD LARLMDCC5MD  7591 LEVEL 3 TELECOM OF MARYLAND, LLC - MD 236      
301-389 0 Washington Zone 13 MD LARLMDCC5MD  7591 LEVEL 3 TELECOM OF MARYLAND, LLC - MD 236      
301-389 1 Washington Zone 13 MD LARLMDCC5MD  7591 LEVEL 3 TELECOM OF MARYLAND, LLC - MD 236      
301-389 2 Washington Zone 13 MD VINNVACBDS0  876D ONVOY, LLC - MD 236   2022-08-21   
301-389 3 Washington Zone 13 MD WASHDCMTX7X  2697 CTC COMMUNICATIONS CORP. - MD 236   2006-06-23   
301-389 4 Washington Zone 13 MD LARLMDCC5MD  7591 LEVEL 3 TELECOM OF MARYLAND, LLC - MD 236      
301-389 5 Washington Zone 13 MD VINNVACBDS0  876D ONVOY, LLC - MD 236   2016-04-06   
301-389 6 Washington Zone 13 MD VINNVACBDS0  876D ONVOY, LLC - MD 236   2016-04-06   
301-389 7 Washington Zone 13 MD LARLMDCC5MD  7591 LEVEL 3 TELECOM OF MARYLAND, LLC - MD 236      
301-389 8 Washington Zone 13 MD LARLMDCC5MD  7591 LEVEL 3 TELECOM OF MARYLAND, LLC - MD 236      
301-389 9 Washington Zone 13 MD LARLMDCC5MD  7591 LEVEL 3 TELECOM OF MARYLAND, LLC - MD 236      
301-390 A Washington Zone 14 MD UPMRMDCCDS0  9212 VERIZON MARYLAND, INC. 236      
301-391 A Damascus MD DMSCMDDERP0  9212 VERIZON MARYLAND, INC. 236      
301-391 0 Damascus MD   515J IP HORIZON LLC 236   2016-05-31   
301-391 1 Damascus MD   2593 CORE COMMUNICATIONS, INC.- MD 236   2018-10-22   
301-391 2 Damascus MD   2593 CORE COMMUNICATIONS, INC.- MD 236   2018-10-22   
301-391 3 Damascus MD   2593 CORE COMMUNICATIONS, INC.- MD 236   2018-10-22   
301-391 4 Damascus MD   2593 CORE COMMUNICATIONS, INC.- MD 236   2018-10-22   
301-391 5 Damascus MD   2593 CORE COMMUNICATIONS, INC.- MD 236   2018-10-22   
301-391 6 Damascus MD DMSCMDDERP0  9212 VERIZON MARYLAND, INC. 236      
301-391 7 Damascus MD   2593 CORE COMMUNICATIONS, INC.- MD 236   2018-10-22   
301-391 8 Damascus MD   2593 CORE COMMUNICATIONS, INC.- MD 236   2018-10-22   
301-391 9 Damascus MD   2593 CORE COMMUNICATIONS, INC.- MD 236   2018-10-22   
301-392 A La Plata MD LPLTMDLADS0  9212 VERIZON MARYLAND, INC. 236      
301-392 0 La Plata MD LPLTMDLADS0  9212 VERIZON MARYLAND, INC. 236      
301-392 1 La Plata MD LPLTMDLADS0  9212 VERIZON MARYLAND, INC. 236      
301-392 2 La Plata MD CHCHMDBE6MD  4716 PAETEC COMMUNICATIONS, INC. - MD 236   2006-12-01   
301-392 3 La Plata MD LPLTMDLADS0  9212 VERIZON MARYLAND, INC. 236      
301-392 4 La Plata MD HRNDVA13AMD  3910 CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD 236   2006-12-01   
301-392 5 La Plata MD LPLTMDLADS0  9212 VERIZON MARYLAND, INC. 236      
301-392 6 La Plata MD LPLTMDLADS0  9212 VERIZON MARYLAND, INC. 236      
301-392 7 La Plata MD WASHDCDP8MD  071F BANDWIDTH.COM CLEC, LLC - MD 236   2011-06-02   
301-392 8 La Plata MD HRNDVACKAMD  2217 ATX TELECOMMUNICATIONS SERVICES, LTD. - MD 236   2004-03-27   
301-392 9 La Plata MD LPLTMDLADS0  9212 VERIZON MARYLAND, INC. 236      

<< 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: BeeVox - Whitelabel Reseller Platform

Like this site? We accept donations via PayPal.