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

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NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
301-377 5 Laurel MD LARLMDLRDS0  9212 VERIZON MARYLAND, INC. 236   2005-11-15   
301-377 6 Laurel MD BTVLMD18GT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236   2010-02-04   
301-377 7 Laurel MD LARLMDLRDS0  9212 VERIZON MARYLAND, INC. 236   2007-02-17   
301-377 8 Laurel MD BTVLMD12CMA  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236   2008-09-08   
301-377 9 Laurel MD WASKDCFNAMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236   2010-05-10   
301-378 A Frederick MD FRDRMDFRXTX  318J COMCAST IP PHONE, LLC 240      
301-378 0 Frederick MD FRDRMDFRXTX  318J COMCAST IP PHONE, LLC 240   2007-04-06   
301-378 1 Frederick MD   829J PAETEC ITEL, LLC 240   2011-03-04   
301-378 2 Frederick MD FRDRMDFRXTX  318J COMCAST IP PHONE, LLC 240   2009-08-13   
301-378 3 Frederick MD FRDRMDFRKMD  5562 METROPCS, INC. 240   2011-07-08   
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   

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Last updated: Fri, 10 Jul 2026 02:55:48 UTC

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