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 48 >>

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
301-888 9 Washington Zone 16 MD BADNMDBNRS0  9212 VERIZON MARYLAND, INC. 236      
301-889 A Washington Zone 14 (Baltimore LATA) MD GLVLMDGLRS1  9212 VERIZON MARYLAND, INC. 238      
301-889 0 Washington Zone 14 (Baltimore LATA) MD GLVLMDGLRS1  9212 VERIZON MARYLAND, INC. 238      
301-889 1 Washington Zone 14 (Baltimore LATA) MD BLTMMDCHXVX  321J HD CARRIER LLC 238   2016-09-05   
301-889 2 Washington Zone 14 (Baltimore LATA) MD BLTMMDCHXUX  624H ONVOY SPECTRUM, LLC 238   2021-11-08   
301-889 3 Washington Zone 14 (Baltimore LATA) MD BLTMMDCHXVX  321J HD CARRIER LLC 238   2016-09-05   
301-889 4 Washington Zone 14 (Baltimore LATA) MD BLTMMDCHXVX  321J HD CARRIER LLC 238   2016-09-05   
301-889 5 Washington Zone 14 (Baltimore LATA) MD BLTMMDCHXVX  321J HD CARRIER LLC 238   2016-09-05   
301-889 6 Washington Zone 14 (Baltimore LATA) MD BLTMMDCHXVX  321J HD CARRIER LLC 238   2016-09-05   
301-889 7 Washington Zone 14 (Baltimore LATA) MD BLTMMDCHXVX  321J HD CARRIER LLC 238   2016-09-05   
301-889 8 Washington Zone 14 (Baltimore LATA) MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2016-04-07   
301-889 9 Washington Zone 14 (Baltimore LATA) MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2016-04-07   
301-890 A Washington Zone 12 MD BTVLMDBVDS0  9212 VERIZON MARYLAND, INC. 236      
301-891 A Washington Zone 3 MD HYVLMDCMDS0  9212 VERIZON MARYLAND, INC. 236      
301-891 0 Washington Zone 3 MD HYVLMDCMDS0  9212 VERIZON MARYLAND, INC. 236      
301-891 1 Washington Zone 3 MD HYVLMDCMDS0  9212 VERIZON MARYLAND, INC. 236      
301-891 2 Washington Zone 3 MD HYVLMDCMDS0  9212 VERIZON MARYLAND, INC. 236      
301-891 3 Washington Zone 3 MD HYVLMDCMDS0  9212 VERIZON MARYLAND, INC. 236      
301-891 4 Washington Zone 3 MD HYVLMDCMDS0  9212 VERIZON MARYLAND, INC. 236      
301-891 5 Washington Zone 3 MD HYVLMDCMDS0  9212 VERIZON MARYLAND, INC. 236      
301-891 6 Washington Zone 3 MD HYVLMDCMDS0  9212 VERIZON MARYLAND, INC. 236      
301-891 7 Washington Zone 3 MD HYVLMDCMDS0  9212 VERIZON MARYLAND, INC. 236      
301-891 8 Washington Zone 3 MD HYVLMDCMDS0  9212 VERIZON MARYLAND, INC. 236      
301-891 9 Washington Zone 3 MD BTVLMD18GT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236   2014-11-06   
301-892 A Washington Zone 4 MD HYVLMDHYPS0  9212 VERIZON MARYLAND, INC. 236      
301-892 0 Washington Zone 4 MD WASKDCFNAMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236   2011-06-02   
301-892 1 Washington Zone 4 MD WASKDCFNAMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236   2011-09-02   
301-892 2 Washington Zone 4 MD WASKDCFNAMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236   2011-06-27   
301-892 3 Washington Zone 4 MD WASHDCDP8MD  071F BANDWIDTH.COM CLEC, LLC - MD 236   2011-05-20   
301-892 4 Washington Zone 4 MD   829J PAETEC ITEL, LLC 236   2010-09-22   
301-892 5 Washington Zone 4 MD WASHDCDP8MD  071F BANDWIDTH.COM CLEC, LLC - MD 236   2011-05-20   
301-892 6 Washington Zone 4 MD WASHDCDP8MD  071F BANDWIDTH.COM CLEC, LLC - MD 236   2012-05-12   
301-892 7 Washington Zone 4 MD WASLDCRGDS0  281E YMAX COMMUNICATIONS CORP. - MD 236   2010-09-01   
301-892 8 Washington Zone 4 MD WASLDCRGDS0  281E YMAX COMMUNICATIONS CORP. - MD 236   2010-09-01   
301-892 9 Washington Zone 4 MD HYVLMDHYPS0  9212 VERIZON MARYLAND, INC. 236   2005-05-02   
301-893 A Washington Zone 6 MD WDRFMDWDDS0  9212 VERIZON MARYLAND, INC. 236      
301-893 0 Washington Zone 6 MD WDRFMDWDDS0  9212 VERIZON MARYLAND, INC. 236      
301-893 1 Washington Zone 6 MD WDRFMDWDDS0  9212 VERIZON MARYLAND, INC. 236      
301-893 2 Washington Zone 6 MD WDRFMDWDDS0  9212 VERIZON MARYLAND, INC. 236      
301-893 3 Washington Zone 6 MD WDRFMDWDDS0  9212 VERIZON MARYLAND, INC. 236      
301-893 4 Washington Zone 6 MD WASHDCDP8MD  071F BANDWIDTH.COM CLEC, LLC - MD 236   2011-05-20   
301-893 5 Washington Zone 6 MD BTVLMD12CMA  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236   2016-08-15   
301-893 6 Washington Zone 6 MD WDRFMDWDDS0  9212 VERIZON MARYLAND, INC. 236      
301-893 7 Washington Zone 6 MD WASHDCDP8MD  071F BANDWIDTH.COM CLEC, LLC - MD 236   2011-05-20   
301-893 8 Washington Zone 6 MD WDRFMDWDDS0  9212 VERIZON MARYLAND, INC. 236      
301-893 9 Washington Zone 6 MD   145J TERRA NOVA TELECOM INC. 236   2021-06-10   
301-894 A Washington Zone 6 MD TMHLMDTHDS0  9212 VERIZON MARYLAND, INC. 236      
301-895 A Grantsville MD GTVLMDGRRS0  9212 VERIZON MARYLAND, INC. 240      
301-895 0 Grantsville MD HGTWMDHGDMD  071F BANDWIDTH.COM CLEC, LLC - MD 240   2012-02-06   
301-895 1 Grantsville MD HGTWMD530MD  073H TELNYX LLC 240   2017-08-08   
301-895 2 Grantsville MD HGTWMDHGDMD  071F BANDWIDTH.COM CLEC, LLC - MD 240   2015-06-20   
301-895 3 Grantsville MD GTVLMDGRRS0  9212 VERIZON MARYLAND, INC. 240      
301-895 4 Grantsville MD GTVLMDGRRS0  9212 VERIZON MARYLAND, INC. 240      
301-895 5 Grantsville MD GTVLMDGRRS0  9212 VERIZON MARYLAND, INC. 240      
301-895 6 Grantsville MD FRDRMDFRXKX  508J CENTURYLINK COMMUNICATIONS, LLC 240   2016-11-12   
301-895 7 Grantsville MD CMLDMDCMEMD  876D ONVOY, LLC - MD 240   2016-09-12   
301-895 8 Grantsville MD FRDRMDFRXTX  318J COMCAST IP PHONE, LLC 240   2010-03-05   
301-895 9 Grantsville MD CMLDMDCMEMD  876D ONVOY, LLC - MD 240   2016-09-12   
301-896 A Washington Zone 2 MD BTHSMDWWDS0  9212 VERIZON MARYLAND, INC. 236      
301-897 A Washington Zone 2 MD BTHSMDWWDS0  9212 VERIZON MARYLAND, INC. 236      
301-898 A Frederick MD WLVLMDWLDS0  9212 VERIZON MARYLAND, INC. 240      
301-898 0 Frederick MD WLVLMDWLDS0  9212 VERIZON MARYLAND, INC. 240      
301-898 1 Frederick MD WLVLMDWLDS0  9212 VERIZON MARYLAND, INC. 240      
301-898 2 Frederick MD FRDRMDFRXTX  318J COMCAST IP PHONE, LLC 240   2008-08-20   
301-898 3 Frederick MD WLVLMDWLDS0  9212 VERIZON MARYLAND, INC. 240      
301-898 4 Frederick MD WLVLMDWLDS0  9212 VERIZON MARYLAND, INC. 240      
301-898 5 Frederick MD WLVLMDWLDS0  9212 VERIZON MARYLAND, INC. 240      
301-898 6 Frederick MD FRDRMDFRKMD  5562 METROPCS, INC. 240   2015-12-27   
301-898 7 Frederick MD WLVLMDWLDS0  9212 VERIZON MARYLAND, INC. 240      
301-898 8 Frederick MD WLVLMDWLDS0  9212 VERIZON MARYLAND, INC. 240      
301-898 9 Frederick MD WLVLMDWLDS0  9212 VERIZON MARYLAND, INC. 240      
301-899 A Washington Zone 5 MD TMHLMDTHDS0  9212 VERIZON MARYLAND, INC. 236      
301-900 A Washington Zone 2 MD VINNVACBDS0  876D ONVOY, LLC - MD 236      
301-900 0 Washington Zone 2 MD VINNVACBDS0  876D ONVOY, LLC - MD 236   2015-04-20   
301-900 1 Washington Zone 2 MD VINNVACBDS0  876D ONVOY, LLC - MD 236   2015-07-27   
301-900 2 Washington Zone 2 MD VINNVACBDS0  876D ONVOY, LLC - MD 236   2015-07-27   
301-900 3 Washington Zone 2 MD VINNVACBDS0  876D ONVOY, LLC - MD 236   2015-07-27   
301-900 4 Washington Zone 2 MD VINNVACBDS0  876D ONVOY, LLC - MD 236   2015-07-27   
301-900 5 Washington Zone 2 MD VINNVACBDS0  876D ONVOY, LLC - MD 236   2015-06-27   
301-900 6 Washington Zone 2 MD VINNVACBDS0  876D ONVOY, LLC - MD 236   2015-07-27   
301-900 7 Washington Zone 2 MD VINNVACBDS0  876D ONVOY, LLC - MD 236   2015-07-27   
301-900 8 Washington Zone 2 MD VINNVACBDS0  876D ONVOY, LLC - MD 236   2015-07-27   
301-900 9 Washington Zone 2 MD VINNVACBDS0  876D ONVOY, LLC - MD 236   2015-04-20   
301-901 A Washington Zone 13 MD CLPKMDBWDS0  9212 VERIZON MARYLAND, INC. 236      
301-901 0 Washington Zone 13 MD VINNVACBDS0  876D ONVOY, LLC - MD 236   2023-10-15   
301-901 1 Washington Zone 13 MD CLPKMDBWDS0  9212 VERIZON MARYLAND, INC. 236      
301-901 2 Washington Zone 13 MD CLPKMDBWDS0  9212 VERIZON MARYLAND, INC. 236      
301-901 3 Washington Zone 13 MD VINNVACBDS0  876D ONVOY, LLC - MD 236   2023-10-15   
301-901 4 Washington Zone 13 MD CLPKMDBWDS0  9212 VERIZON MARYLAND, INC. 236      
301-901 5 Washington Zone 13 MD VINNVACBDS0  876D ONVOY, LLC - MD 236   2023-10-15   
301-901 6 Washington Zone 13 MD CLPKMDBWDS0  9212 VERIZON MARYLAND, INC. 236      
301-901 7 Washington Zone 13 MD VINNVACBDS0  876D ONVOY, LLC - MD 236   2023-10-15   
301-901 8 Washington Zone 13 MD VINNVACBDS0  876D ONVOY, LLC - MD 236   2023-10-15   
301-901 9 Washington Zone 13 MD CLPKMDBWDS0  9212 VERIZON MARYLAND, INC. 236      
301-902 A Washington Zone 13 MD BTVLMDBVDS0  9212 VERIZON MARYLAND, INC. 236      
301-902 0 Washington Zone 13 MD VINNVACBDS0  876D ONVOY, LLC - MD 236   2020-12-03   
301-902 1 Washington Zone 13 MD BTVLMDBVDS0  9212 VERIZON MARYLAND, INC. 236      
301-902 2 Washington Zone 13 MD BTVLMDBVDS0  9212 VERIZON MARYLAND, INC. 236      
301-902 3 Washington Zone 13 MD BTVLMDBVDS0  9212 VERIZON MARYLAND, INC. 236      
301-902 4 Washington Zone 13 MD WASHDCINDS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 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 48 >>

Last updated: Sat, 02 May 2026 12:20:53 UTC

Sponsored by: LES.NET

Like this site? We accept donations via PayPal.