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
410-735 4 BLTMMDLBRP0  9212 VERIZON MARYLAND, INC. 238   2003-10-18   
410-735 5 PIVLMDPKXGX  829J PAETEC ITEL, LLC 238      
410-735 6 BLTMMDLBRP0  9212 VERIZON MARYLAND, INC. 238   2003-09-26   
410-735 7 BLTMMDLBRP0  9212 VERIZON MARYLAND, INC. 238   2003-09-26   
410-735 8 PIVLMDPKXGX  829J PAETEC ITEL, LLC 238      
410-735 9 PIVLMDPKXGX  829J PAETEC ITEL, LLC 238      
410-736 A BLTMMDCHDS2  9212 VERIZON MARYLAND, INC. 238      
410-736 0 CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2003-02-02   
410-736 1 CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2003-02-02   
410-736 2 CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2003-02-02   
410-736 3 CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2003-02-02   
410-736 4 BLTMMDCHDS2  9212 VERIZON MARYLAND, INC. 238      
410-736 5 BLTMMDCHDS2  9212 VERIZON MARYLAND, INC. 238      
410-736 6 BLTMMDCHDS2  9212 VERIZON MARYLAND, INC. 238      
410-736 7 BLTMMDCHDS2  9212 VERIZON MARYLAND, INC. 238      
410-736 8 CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2003-02-02   
410-736 9 CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2003-02-02   
410-743 A HNVAMDAE3MD  6630 SPOK, INC. 238      
410-746 A BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238      
410-752 A BLTMMDCHDS3  9212 VERIZON MARYLAND, INC. 238      
410-759 A CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238      
410-759 0 CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2024-02-15   
410-759 1 CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2024-02-15   
410-759 2   2593 CORE COMMUNICATIONS, INC.- MD 238   2019-05-01   
410-759 3   2593 CORE COMMUNICATIONS, INC.- MD 238   2019-05-01   
410-759 4   2593 CORE COMMUNICATIONS, INC.- MD 238   2019-05-01   
410-759 5   2593 CORE COMMUNICATIONS, INC.- MD 238   2019-05-01   
410-759 6   2593 CORE COMMUNICATIONS, INC.- MD 238   2019-05-01   
410-759 7   2593 CORE COMMUNICATIONS, INC.- MD 238   2019-04-12   
410-759 8 BLTMMDCH08Z  4492 VDL, INC. DBA GLOBAL TELECOM BROKERS - MD 238   2016-12-24   
410-759 9 CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2024-02-15   
410-764 A PIVLMDPKDS1  9212 VERIZON MARYLAND, INC. 238      
410-767 A BLTMMDMDDS0  9212 VERIZON MARYLAND, INC. 238      
410-779 A BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238      
410-779 0 PIVLMDPKXGX  829J PAETEC ITEL, LLC 238      
410-779 1 PIVLMDPKXGX  829J PAETEC ITEL, LLC 238      
410-779 2 PIVLMDPKXGX  829J PAETEC ITEL, LLC 238      
410-779 3 BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238      
410-779 4 PIVLMDPKXEX  829J PAETEC ITEL, LLC 238   2010-01-15   
410-779 5 PIVLMDPKXGX  829J PAETEC ITEL, LLC 238      
410-779 6 PIVLMDPKXGX  829J PAETEC ITEL, LLC 238      
410-779 7 PIVLMDPKXGX  829J PAETEC ITEL, LLC 238      
410-779 8 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2006-02-07   
410-779 9 BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2010-03-29   
410-783 A BLTMMDCHDS3  9212 VERIZON MARYLAND, INC. 238      
410-800 A BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238      
410-800 0 PIVLMDPKXGX  829J PAETEC ITEL, LLC 238   2004-11-26   
410-800 1 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2005-06-19   
410-800 2 BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238   2005-03-10   
410-800 3 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2005-11-07   

<< 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: BeeVox - Whitelabel Reseller Platform

Like this site? We accept donations via PayPal.