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
301-630 A Washington Zone 6 MD TMHLMDTHDS0  9212 VERIZON MARYLAND, INC. 236      
301-631 A Frederick MD FRDRMDFRDS1  9212 VERIZON MARYLAND, INC. 240      
301-631 0 Frederick MD FRDRMDFRDS1  9212 VERIZON MARYLAND, INC. 240      
301-631 1 Frederick MD FRDRMDFRDS1  9212 VERIZON MARYLAND, INC. 240      
301-631 2 Frederick MD FRDRMDFRDS1  9212 VERIZON MARYLAND, INC. 240      
301-631 3 Frederick MD FRDRMDFRDS1  9212 VERIZON MARYLAND, INC. 240      
301-631 4 Frederick MD FRDRMDFRKMD  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 240   2015-11-27   
301-631 5 Frederick MD FRDRMDFRDS1  9212 VERIZON MARYLAND, INC. 240      
301-631 6 Frederick MD FRDRMDFRDS1  9212 VERIZON MARYLAND, INC. 240      
301-631 7 Frederick MD FRDRMDFRDS1  9212 VERIZON MARYLAND, INC. 240      
301-631 8 Frederick MD FRDRMDFRDS1  9212 VERIZON MARYLAND, INC. 240      
301-631 9 Frederick MD FRDRMDFRDS1  9212 VERIZON MARYLAND, INC. 240      
301-632 A Waldorf MD WDRFMDWDDS0  9212 VERIZON MARYLAND, INC. 236      
301-632 0 Waldorf MD   2593 CORE COMMUNICATIONS, INC.- MD 236   2018-10-23   
301-632 1 Waldorf MD   2593 CORE COMMUNICATIONS, INC.- MD 236   2018-10-23   
301-632 2 Waldorf MD WDRFMDWDDS0  9212 VERIZON MARYLAND, INC. 236      
301-632 3 Waldorf MD WDRFMDWDDS0  9212 VERIZON MARYLAND, INC. 236      
301-632 4 Waldorf MD WDRFMDWDDS0  9212 VERIZON MARYLAND, INC. 236      
301-632 5 Waldorf MD WDRFMDWDDS0  9212 VERIZON MARYLAND, INC. 236      
301-632 6 Waldorf MD WDRFMDWDDS0  9212 VERIZON MARYLAND, INC. 236      
301-632 7 Waldorf MD WDRFMDWDDS0  9212 VERIZON MARYLAND, INC. 236      
301-632 8 Waldorf MD WDRFMDWDDS0  9212 VERIZON MARYLAND, INC. 236      
301-632 9 Waldorf MD WDRFMDWDDS0  9212 VERIZON MARYLAND, INC. 236      
301-633 A Washington Zone 2 MD BTVLMD18GT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236      
301-634 A Washington Zone 2 MD WASHDCTTDS0  7529 TELEPORT COMMUNICATIONS AMERICA, LLC - DC 236      
301-635 A Washington Zone 5 MD WASHDCDP8MD  071F BANDWIDTH.COM CLEC, LLC - MD 236      
301-635 0 Washington Zone 5 MD VINNVACBDS0  876D ONVOY, LLC - MD 236   2023-05-16   
301-635 1 Washington Zone 5 MD VINNVACBDS0  876D ONVOY, LLC - MD 236   2023-05-16   
301-635 2 Washington Zone 5 MD VINNVACBDS0  876D ONVOY, LLC - MD 236   2023-01-07   
301-635 3 Washington Zone 5 MD VINNVACBDS0  876D ONVOY, LLC - MD 236   2023-09-14   
301-635 4 Washington Zone 5 MD VINNVACBDS0  876D ONVOY, LLC - MD 236   2023-09-14   
301-635 5 Washington Zone 5 MD VINNVACBDS0  876D ONVOY, LLC - MD 236   2023-09-14   
301-635 6 Washington Zone 5 MD VINNVACBDS0  876D ONVOY, LLC - MD 236   2023-02-09   
301-635 7 Washington Zone 5 MD VINNVACBDS0  876D ONVOY, LLC - MD 236   2023-02-09   
301-635 8 Washington Zone 5 MD WASKDCFNAMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236   2022-11-03   
301-635 9 Washington Zone 5 MD WASKDCFNAMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236   2023-09-07   
301-636 A Washington Zone 5 MD LDVRMDLODS0  9212 VERIZON MARYLAND, INC. 236      
301-636 0 Washington Zone 5 MD WASKDCFNAMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236   2019-10-28   
301-636 1 Washington Zone 5 MD LDVRMDLODS0  9212 VERIZON MARYLAND, INC. 236      
301-636 2 Washington Zone 5 MD LDVRMDLODS0  9212 VERIZON MARYLAND, INC. 236      
301-636 3 Washington Zone 5 MD ARTNVAARXDY  318J COMCAST IP PHONE, LLC 236   2013-08-27   
301-636 4 Washington Zone 5 MD ARTNVAARXDY  318J COMCAST IP PHONE, LLC 236   2010-01-09   
301-636 5 Washington Zone 5 MD WASHDCDP8MD  071F BANDWIDTH.COM CLEC, LLC - MD 236   2010-09-27   
301-636 6 Washington Zone 5 MD LDVRMDLODS0  9212 VERIZON MARYLAND, INC. 236      
301-636 7 Washington Zone 5 MD WASHDCDP8MD  071F BANDWIDTH.COM CLEC, LLC - MD 236   2010-09-27   
301-636 8 Washington Zone 5 MD LDVRMDLODS0  9212 VERIZON MARYLAND, INC. 236      
301-636 9 Washington Zone 5 MD LDVRMDLODS0  9212 VERIZON MARYLAND, INC. 236      
301-637 A Washington Zone 10 MD MCLNVA23DS4  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 236      
301-637 0 Washington Zone 10 MD MCLNVA23DS4  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 236   2004-12-13   
301-637 1 Washington Zone 10 MD   829J PAETEC ITEL, LLC 236   2005-12-15   

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

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