Local Calling Guide

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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
301-693 A Frederick MD FRDRMDFRKMD  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 240      
301-694 A Frederick MD FRDRMDFRDS1  9212 VERIZON MARYLAND, INC. 240      
301-695 A Frederick MD FRDRMDFRDS1  9212 VERIZON MARYLAND, INC. 240      
301-696 A Frederick MD FRDRMDFRDS1  9212 VERIZON MARYLAND, INC. 240      
301-697 A Cumberland MD MNRVMDMOXFX  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 240      
301-698 A Frederick MD FRDRMDFRDS1  9212 VERIZON MARYLAND, INC. 240      
301-699 A Washington Zone 4 MD HYVLMDHYDS0  9212 VERIZON MARYLAND, INC. 236      
301-701 A Washington Zone 13 MD WASHDCDP8MD  071F BANDWIDTH.COM CLEC, LLC - MD 236      
301-701 0 Washington Zone 13 MD BTVLMD12CMA  5562 METROPCS, INC. 236   2018-04-08   
301-701 1 Washington Zone 13 MD WASHDCSWMMD  624H ONVOY SPECTRUM, LLC 236   2024-12-05   
301-701 2 Washington Zone 13 MD VINNVACBDS0  876D ONVOY, LLC - MD 236   2020-12-03   
301-701 3 Washington Zone 13 MD VINNVACBDS0  876D ONVOY, LLC - MD 236   2020-12-03   
301-701 4 Washington Zone 13 MD VINNVACBDS0  876D ONVOY, LLC - MD 236   2020-12-03   
301-701 5 Washington Zone 13 MD VINNVACBDS0  876D ONVOY, LLC - MD 236   2020-12-03   
301-701 6 Washington Zone 13 MD WASHDC125MD  197D VONAGE AMERICA LLC 236   2020-05-20   
301-701 7 Washington Zone 13 MD WASHDCSWMMD  624H ONVOY SPECTRUM, LLC 236   2024-12-05   
301-701 8 Washington Zone 13 MD WASHDCSWMMD  624H ONVOY SPECTRUM, LLC 236   2024-12-05   
301-701 9 Washington Zone 13 MD WASHDCSWMMD  624H ONVOY SPECTRUM, LLC 236   2024-12-05   
301-702 A Washington Zone 5 MD TMHLMDTHDS0  9212 VERIZON MARYLAND, INC. 236      
301-703 A Mount Airy MD FRDRMDFRXMD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 240      
301-703 0 Mount Airy MD MNRVMDMOXFX  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 240   2014-05-05   
301-703 1 Mount Airy MD FRDRMDFRXTX  318J COMCAST IP PHONE, LLC 240   2015-09-17   
301-703 2 Mount Airy MD FRDRMDFRXMD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 240   2006-05-20   
301-703 3 Mount Airy MD   829J PAETEC ITEL, LLC 240   2009-11-16   
301-703 4 Mount Airy MD MTARMDMARS1  9212 VERIZON MARYLAND, INC. 240   2004-11-17   
301-703 5 Mount Airy MD FRDRMDFRXTX  318J COMCAST IP PHONE, LLC 240   2012-05-26   
301-703 6 Mount Airy MD FRDRMDFRXAX  7325 TELEPORT COMMUNICATIONS AMERICA, LLC - MD 240   2013-06-10   
301-703 7 Mount Airy MD FRDRMDFRXPX  624H ONVOY SPECTRUM, LLC 240   2021-11-08   
301-703 8 Mount Airy MD FRDRMDFRXTX  318J COMCAST IP PHONE, LLC 240   2007-04-07   
301-703 9 Mount Airy MD FRDRMDFRXMD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 240   2005-02-17   
301-704 A Washington Zone 3 MD WASKDCFNAMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236      
301-705 A Waldorf MD WDRFMDWDDS0  9212 VERIZON MARYLAND, INC. 236      
301-705 0 Waldorf MD WDRFMDWDDS0  9212 VERIZON MARYLAND, INC. 236      
301-705 2 Waldorf MD WDRFMDWDDS0  9212 VERIZON MARYLAND, INC. 236      
301-705 3 Waldorf MD WDRFMDWDDS0  9212 VERIZON MARYLAND, INC. 236      
301-705 4 Waldorf MD WDRFMDWDDS0  9212 VERIZON MARYLAND, INC. 236      
301-705 5 Waldorf MD WDRFMDWDDS0  9212 VERIZON MARYLAND, INC. 236      
301-705 6 Waldorf MD WDRFMDWDDS0  9212 VERIZON MARYLAND, INC. 236      
301-705 7 Waldorf MD WDRFMDWDDS0  9212 VERIZON MARYLAND, INC. 236      
301-705 8 Waldorf MD WDRFMDWDDS0  9212 VERIZON MARYLAND, INC. 236      
301-705 9 Waldorf MD WDRFMDWDDS0  9212 VERIZON MARYLAND, INC. 236      
301-706 A Washington Zone 3 MD WASKDCFNAMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236      
301-707 A Cumberland MD CMLDMDCM5MD  4720 USCOC OF CUMBERLAND, INC. DBA UNITED STATES CEL MD 240      
301-708 A Laurel (Baltimore LATA) MD BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238      
301-708 0 Laurel (Baltimore LATA) MD BLTQMD01DS0  568G PEERLESS NETWORK OF MARYLAND, LLC 238   2013-05-04   
301-708 1 Laurel (Baltimore LATA) MD BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2011-11-18   
301-708 2 Laurel (Baltimore LATA) MD BLTQMD01DS0  568G PEERLESS NETWORK OF MARYLAND, LLC 238   2013-05-04   
301-708 3 Laurel (Baltimore LATA) MD BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2020-09-12   
301-708 4 Laurel (Baltimore LATA) MD BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2014-09-01   
301-708 5 Laurel (Baltimore LATA) MD BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2011-12-16   

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Last updated: Tue, 31 Mar 2026 13:56:49 UTC

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