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
410-387 8 BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2011-10-28   
410-387 9 BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2011-10-28   
410-389 A HNVAMDAE3MD  6630 SPOK, INC. 238      
410-393 A CYVLMDDADS0  9212 VERIZON MARYLAND, INC. 238      
410-396 A BLTMMDCHDS2  9212 VERIZON MARYLAND, INC. 238      
410-400 A PIVLMDPKXGX  829J PAETEC ITEL, LLC 238   2025-04-01   
410-400 0 PIVLMDPKXGX  829J PAETEC ITEL, LLC 238   2006-08-06   
410-400 1 PIVLMDPKXGX  829J PAETEC ITEL, LLC 238   2006-08-06   
410-400 2 PIVLMDPKXGX  829J PAETEC ITEL, LLC 238   2006-08-06   
410-400 3 PIVLMDPKXGX  829J PAETEC ITEL, LLC 238   2006-08-06   
410-400 4 PIVLMDPKXGX  829J PAETEC ITEL, LLC 238   2006-08-06   
410-400 5 PIVLMDPKXGX  829J PAETEC ITEL, LLC 238   2006-08-06   
410-400 6 PIVLMDPKXGX  829J PAETEC ITEL, LLC 238   2006-08-06   
410-400 7 PIVLMDPKXGX  829J PAETEC ITEL, LLC 238   2006-08-06   
410-400 8 PIVLMDPKXGX  829J PAETEC ITEL, LLC 238   2006-08-06   
410-400 9 PIVLMDPKXGX  829J PAETEC ITEL, LLC 238   2006-08-06   
410-404 A BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238      
410-409 A BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238      
410-410 A BLTMMDCHXUX  624H ONVOY SPECTRUM, LLC 238      
410-410 0 BLTMMDCHXUX  624H ONVOY SPECTRUM, LLC 238   2023-07-21   
410-410 1 BLTMMDCHXUX  624H ONVOY SPECTRUM, LLC 238   2023-07-21   
410-410 2 BLTMMDCHXUX  624H ONVOY SPECTRUM, LLC 238   2023-07-21   
410-410 3 BLTMMDCHXUX  624H ONVOY SPECTRUM, LLC 238   2023-07-21   
410-410 4 BLTMMDCHXUX  624H ONVOY SPECTRUM, LLC 238   2023-07-21   
410-410 5 BLTMMDCHXUX  624H ONVOY SPECTRUM, LLC 238   2023-07-21   
410-410 6 BLTMMDCHXUX  624H ONVOY SPECTRUM, LLC 238   2023-07-21   
410-410 7 BLTMMDCHXUX  624H ONVOY SPECTRUM, LLC 238   2023-07-21   
410-410 8 BLTMMDCHXUX  624H ONVOY SPECTRUM, LLC 238   2023-07-21   
410-410 9 BLTMMDCHXUX  624H ONVOY SPECTRUM, LLC 238   2023-07-21   
410-419 A BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238      
410-419 0 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238      
410-419 1 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238      
410-419 2 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238      
410-419 3 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238      
410-419 4 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238      
410-419 5 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238      
410-419 6 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238      
410-419 7 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238      
410-419 8 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238      
410-419 9 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238      
410-426 A BLTMMDHMDS0  9212 VERIZON MARYLAND, INC. 238      
410-433 A BLTMMDYKRP0  9212 VERIZON MARYLAND, INC. 238      
410-435 A BLTMMDYKRP0  9212 VERIZON MARYLAND, INC. 238      
410-444 A BLTMMDHMDS0  9212 VERIZON MARYLAND, INC. 238      
410-445 A HNVAMDAE3MD  6630 SPOK, INC. 238      
410-448 A WDLWMDWLDS0  9212 VERIZON MARYLAND, INC. 238      
410-448 0 WDLWMDWLDS0  9212 VERIZON MARYLAND, INC. 238      
410-448 1 WDLWMDWLDS0  9212 VERIZON MARYLAND, INC. 238      
410-448 2 WDLWMDWLDS0  9212 VERIZON MARYLAND, INC. 238      
410-448 3 WDLWMDWLDS0  9212 VERIZON MARYLAND, INC. 238      

<< 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: VoIP Much Phone Company

Like this site? We accept donations via PayPal.