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 >>

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
410-362 A BLTMMDEDRP0  9212 VERIZON MARYLAND, INC. 238      
410-365 A BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238      
410-365 0   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238      
410-365 1   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238      
410-365 2   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238      
410-365 3   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238      
410-365 4   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238      
410-365 5   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238      
410-365 6   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238      
410-365 7   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238      
410-365 8   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238      
410-365 9   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238      
410-366 A BLTMMDUVDS0  9212 VERIZON MARYLAND, INC. 238      
410-367 A BLTMMDLBDS0  9212 VERIZON MARYLAND, INC. 238      
410-368 A ARBTMDARDS0  9212 VERIZON MARYLAND, INC. 238      
410-368 0   071F BANDWIDTH.COM CLEC, LLC - MD 238   2020-07-04   
410-368 1   9212 VERIZON MARYLAND, INC. 238      
410-368 2   9212 VERIZON MARYLAND, INC. 238      
410-368 3   9212 VERIZON MARYLAND, INC. 238      
410-368 4   9212 VERIZON MARYLAND, INC. 238      
410-368 5   9212 VERIZON MARYLAND, INC. 238      
410-368 6   9212 VERIZON MARYLAND, INC. 238      
410-368 7   9212 VERIZON MARYLAND, INC. 238      
410-368 8   9212 VERIZON MARYLAND, INC. 238      
410-368 9   9212 VERIZON MARYLAND, INC. 238      
410-369 A BLTMMDDNDS2  7591 LEVEL 3 TELECOM OF MARYLAND, LLC - MD 238      
410-369 0   7591 LEVEL 3 TELECOM OF MARYLAND, LLC - MD 238      
410-369 1   7591 LEVEL 3 TELECOM OF MARYLAND, LLC - MD 238      
410-369 2   7591 LEVEL 3 TELECOM OF MARYLAND, LLC - MD 238      
410-369 3   7591 LEVEL 3 TELECOM OF MARYLAND, LLC - MD 238      
410-369 4   7591 LEVEL 3 TELECOM OF MARYLAND, LLC - MD 238      
410-369 5   7591 LEVEL 3 TELECOM OF MARYLAND, LLC - MD 238      
410-369 6   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2006-01-13   
410-369 7   7591 LEVEL 3 TELECOM OF MARYLAND, LLC - MD 238      
410-369 8   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2006-01-13   
410-369 9   7591 LEVEL 3 TELECOM OF MARYLAND, LLC - MD 238      
410-371 A BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238      
410-375 A BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238      
410-382 A BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238      
410-383 A BLTMMDMDDS0  9212 VERIZON MARYLAND, INC. 238      
410-385 A BLTMMDCHDS3  9212 VERIZON MARYLAND, INC. 238      
410-387 A   829J PAETEC ITEL, LLC 238   2025-04-01   
410-387 0   4492 VDL, INC. DBA GLOBAL TELECOM BROKERS - MD 238   2011-10-11   
410-387 1   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2011-10-28   
410-387 2   829J PAETEC ITEL, LLC 238   2011-10-09   
410-387 3   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2011-10-28   
410-387 4   829J PAETEC ITEL, LLC 238   2011-10-09   
410-387 5   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2011-10-28   
410-387 6   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2011-10-28   
410-387 7   829J PAETEC ITEL, LLC 238   2011-10-11   
410-387 8   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2011-10-28   
410-387 9   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2011-10-28   
410-389 A HNVAMDAE3MD  6630 USA MOBILITY WIRELESS, INC. 238      
410-393 A CYVLMDDADS0  9212 VERIZON MARYLAND, INC. 238      
410-396 A BLTMMDCHDS2  9212 VERIZON MARYLAND, INC. 238      
410-400 A   829J PAETEC ITEL, LLC 238   2025-04-01   
410-400 0   829J PAETEC ITEL, LLC 238   2006-08-06   
410-400 1   829J PAETEC ITEL, LLC 238   2006-08-06   
410-400 2   829J PAETEC ITEL, LLC 238   2006-08-06   
410-400 3   829J PAETEC ITEL, LLC 238   2006-08-06   
410-400 4   829J PAETEC ITEL, LLC 238   2006-08-06   
410-400 5   829J PAETEC ITEL, LLC 238   2006-08-06   
410-400 6   829J PAETEC ITEL, LLC 238   2006-08-06   
410-400 7   829J PAETEC ITEL, LLC 238   2006-08-06   
410-400 8   829J PAETEC ITEL, LLC 238   2006-08-06   
410-400 9   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   624H ONVOY SPECTRUM, LLC 238   2023-07-21   
410-410 1   624H ONVOY SPECTRUM, LLC 238   2023-07-21   
410-410 2   624H ONVOY SPECTRUM, LLC 238   2023-07-21   
410-410 3   624H ONVOY SPECTRUM, LLC 238   2023-07-21   
410-410 4   624H ONVOY SPECTRUM, LLC 238   2023-07-21   
410-410 5   624H ONVOY SPECTRUM, LLC 238   2023-07-21   
410-410 6   624H ONVOY SPECTRUM, LLC 238   2023-07-21   
410-410 7   624H ONVOY SPECTRUM, LLC 238   2023-07-21   
410-410 8   624H ONVOY SPECTRUM, LLC 238   2023-07-21   
410-410 9   624H ONVOY SPECTRUM, LLC 238   2023-07-21   
410-419 A BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238      
410-419 0   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238      
410-419 1   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238      
410-419 2   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238      
410-419 3   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238      
410-419 4   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238      
410-419 5   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238      
410-419 6   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238      
410-419 7   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238      
410-419 8   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238      
410-419 9   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238      
410-426 A BLTMMDHMDS0  9212 VERIZON MARYLAND, INC. 238      
410-433 A BLTMMDYKDS0  9212 VERIZON MARYLAND, INC. 238      
410-435 A BLTMMDYKDS0  9212 VERIZON MARYLAND, INC. 238      
410-444 A BLTMMDHMDS0  9212 VERIZON MARYLAND, INC. 238      
410-445 A HNVAMDAE3MD  6630 USA MOBILITY WIRELESS, INC. 238      
410-448 A WDLWMDWLDS0  9212 VERIZON MARYLAND, INC. 238      
410-448 0   9212 VERIZON MARYLAND, INC. 238      
410-448 1   9212 VERIZON MARYLAND, INC. 238      
410-448 2   9212 VERIZON MARYLAND, INC. 238      
410-448 3   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 >>

Last updated: Thu, 01 Jan 2026 03:59:49 UTC

Sponsored by: VoIP.ms

Like this site? We accept donations via PayPal.