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.

Baltimore, MD

<< 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 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 >>

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
443-884 1 PIVLMDPKXGX  829J PAETEC ITEL, LLC 238      
443-884 2 BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2020-07-04   
443-884 3 BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2020-07-04   
443-884 4 BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2020-05-13   
443-884 5 BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2020-07-04   
443-884 6 PIVLMDPKXGX  829J PAETEC ITEL, LLC 238      
443-884 7 PIVLMDPKXGX  829J PAETEC ITEL, LLC 238      
443-884 8 PIVLMDPKXGX  829J PAETEC ITEL, LLC 238      
443-884 9 BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2020-07-04   
443-885 A BLTMMDHMDS0  9212 VERIZON MARYLAND, INC. 238      
443-885 0 BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2015-05-14   
443-885 1 BLTMMDHMDS0  9212 VERIZON MARYLAND, INC. 238      
443-885 2 BLTMMDHMDS0  9212 VERIZON MARYLAND, INC. 238      
443-885 3 BLTMMDHMDS0  9212 VERIZON MARYLAND, INC. 238      
443-885 4 BLTMMDHMDS0  9212 VERIZON MARYLAND, INC. 238      
443-885 5 BLTMMDHMDS0  9212 VERIZON MARYLAND, INC. 238      
443-885 6 BLTMMDHMDS0  9212 VERIZON MARYLAND, INC. 238      
443-885 7 BLTMMDHMDS0  9212 VERIZON MARYLAND, INC. 238      
443-885 8 BLTMMDHMDS0  9212 VERIZON MARYLAND, INC. 238      
443-885 9 BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238   2015-04-02   
443-890 A BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238      
443-890 0 BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2011-10-07   
443-890 1 BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2011-10-07   
443-890 2 BLTMMDCHXUX  624H ONVOY SPECTRUM, LLC 238   2024-10-23   
443-890 3 BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2011-10-10   
443-890 4 BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2011-10-10   
443-890 5 BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2011-10-10   
443-890 6 BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2011-10-10   
443-890 7 BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2011-10-10   
443-890 8 BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2011-10-10   
443-890 9 BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2011-10-10   
443-894 A BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2024-02-09   
443-894 0 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2011-08-14   
443-894 1 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2011-08-14   
443-894 2 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2011-08-14   
443-894 3 BLTMMDCH40Z  5562 METROPCS, INC. 238   2011-08-14   
443-894 4 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2011-08-14   
443-894 5 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2011-08-14   
443-894 6 BLTMMDCH40Z  5562 METROPCS, INC. 238   2011-08-14   
443-894 7 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2011-08-14   
443-894 8 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2011-08-14   
443-894 9 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2011-08-14   
443-897 A CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238      
443-897 0 CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2011-06-11   
443-897 1 CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2011-06-11   
443-897 2 CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2011-06-11   
443-897 3 CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2011-06-11   
443-897 4   2593 CORE COMMUNICATIONS, INC.- MD 238   2019-04-12   
443-897 5 BLTMMDSNDS6  281E YMAX COMMUNICATIONS CORP. - MD 238   2011-06-17   
443-897 6 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2011-07-08   

<< 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 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 >>

Last updated: Tue, 29 Sep 2026 03:00:13 UTC

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.