Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
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NPA: 410 [Rate centres in NPA 410] [Dial plan for NPA 410]

NXX: 344

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
410-344 A Chase MD CHASMDCHRP0  9212 VERIZON MARYLAND, INC. 238      
410-344 0 Chase MD   9212 VERIZON MARYLAND, INC. 238      
410-344 1 Chase MD   9212 VERIZON MARYLAND, INC. 238      
410-344 2 Chase MD   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2008-03-13   
410-344 3 Chase MD   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2014-05-30   
410-344 4 Chase MD   8697 BALTIMORE-WASHINGTON TELEPHONE (BWT) 238   2015-06-09   
410-344 5 Chase MD   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2003-06-08   
410-344 6 Chase MD   318J COMCAST IP PHONE, LLC 238   2012-07-21   
410-344 7 Chase MD   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2006-01-02   
410-344 8 Chase MD   829J PAETEC ITEL, LLC 238   2003-02-25   
410-344 9 Chase MD   9212 VERIZON MARYLAND, INC. 238      

Last updated: Thu, 29 Jan 2026 14:35:03 UTC

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