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
301-501 3 Oakland MD MNRVMDMOXFX  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 240   2014-11-24   
301-501 4 Oakland MD   2593 CORE COMMUNICATIONS, INC.- MD 240   2019-07-31   
301-501 5 Oakland MD FRDRMDFRX7X  7228 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 240   2010-01-04   
301-501 6 Oakland MD MNRVMDMOXFX  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 240      
301-501 7 Oakland MD MNRVMDMOXFX  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 240   2007-10-25   
301-501 8 Oakland MD MNRVMDMOXFX  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 240   2014-03-20   
301-501 9 Oakland MD   2593 CORE COMMUNICATIONS, INC.- MD 240   2019-07-31   
301-502 A Washington Zone 3 MD WASKDCFNAMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236      
301-503 A Washington Zone 2 MD BTVLMD18GT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236      
301-504 A Washington Zone 3 MD SLSPMDSSDSS  9212 VERIZON MARYLAND, INC. 236      
301-505 A Washington Zone 6 MD TMHLMDTHDS0  9212 VERIZON MARYLAND, INC. 236      
301-506 A Washington Zone 13 MD SLSPMDSSX6X  6630 SPOK, INC. 236      
301-507 A Washington Zone 13 MD CLPKMDBWDS0  9212 VERIZON MARYLAND, INC. 236      
301-507 0 Washington Zone 13 MD VINNVACBDS0  876D ONVOY, LLC - MD 236   2024-02-24   
301-507 1 Washington Zone 13 MD VINNVACBDS0  876D ONVOY, LLC - MD 236   2024-02-24   
301-507 2 Washington Zone 13 MD VINNVACBDS0  876D ONVOY, LLC - MD 236   2024-02-24   
301-507 3 Washington Zone 13 MD VINNVACBDS0  876D ONVOY, LLC - MD 236   2024-02-24   
301-507 4 Washington Zone 13 MD VINNVACBDS0  876D ONVOY, LLC - MD 236   2024-07-27   
301-507 5 Washington Zone 13 MD CLPKMDBWDS0  9212 VERIZON MARYLAND, INC. 236      
301-507 6 Washington Zone 13 MD CLPKMDBWDS0  9212 VERIZON MARYLAND, INC. 236      
301-507 7 Washington Zone 13 MD VINNVACBDS0  876D ONVOY, LLC - MD 236   2024-07-27   
301-507 8 Washington Zone 13 MD VINNVACBDS0  876D ONVOY, LLC - MD 236   2024-07-27   
301-507 9 Washington Zone 13 MD VINNVACBDS0  876D ONVOY, LLC - MD 236   2024-07-27   
301-508 A Myersville MD MNRVMDMOXFX  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 240      
301-508 0 Myersville MD MNRVMDMOXFX  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 240      
301-508 1 Myersville MD MNRVMDMOXFX  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 240   2017-09-05   
301-508 2 Myersville MD MNRVMDMOXFX  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 240   2017-09-05   
301-508 3 Myersville MD MNRVMDMOXFX  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 240   2017-09-05   
301-508 4 Myersville MD MNRVMDMOXFX  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 240   2018-01-08   
301-508 5 Myersville MD   2593 CORE COMMUNICATIONS, INC.- MD 240   2019-05-02   
301-508 6 Myersville MD FRDRMDFRXKX  508J CENTURYLINK COMMUNICATIONS, LLC 240   2016-10-27   
301-508 7 Myersville MD FRDRMDFRXTX  318J COMCAST IP PHONE, LLC 240   2007-04-07   
301-508 8 Myersville MD FRDRMDFRXTX  318J COMCAST IP PHONE, LLC 240   2019-05-10   
301-508 9 Myersville MD HGTWMDHGDMD  071F BANDWIDTH.COM CLEC, LLC - MD 240   2007-06-04   
301-509 A Washington Zone 3 MD WASKDCFNAMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236      
301-510 A Washington Zone 13 MD SLSPMDSSX6X  6630 SPOK, INC. 236      
301-512 A Washington Zone 3 MD WASKDCFNAMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236      
301-513 A Washington Zone 13 MD CLPKMDBWDS0  9212 VERIZON MARYLAND, INC. 236      
301-513 0 Washington Zone 13 MD CLPKMDBWDS0  9212 VERIZON MARYLAND, INC. 236      
301-513 1 Washington Zone 13 MD CLPKMDBWDS0  9212 VERIZON MARYLAND, INC. 236      
301-513 2 Washington Zone 13 MD   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236   2025-06-01   
301-513 3 Washington Zone 13 MD CLPKMDBWDS0  9212 VERIZON MARYLAND, INC. 236      
301-513 4 Washington Zone 13 MD   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236   2025-06-01   
301-513 5 Washington Zone 13 MD CLPKMDBWDS0  9212 VERIZON MARYLAND, INC. 236      
301-513 6 Washington Zone 13 MD CLPKMDBWDS0  9212 VERIZON MARYLAND, INC. 236      
301-513 7 Washington Zone 13 MD CLPKMDBWDS0  9212 VERIZON MARYLAND, INC. 236      
301-513 8 Washington Zone 13 MD VINNVACBDS0  876D ONVOY, LLC - MD 236   2024-09-15   
301-513 9 Washington Zone 13 MD CLPKMDBWDS0  9212 VERIZON MARYLAND, INC. 236      
301-514 A Frederick MD FRDRMDFRXSX  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 240      
301-515 A Gaithersburg MD GMTWMDGNDS0  9212 VERIZON MARYLAND, INC. 236      

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

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