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.

NPA: 410 [Rate centres in NPA 410] [Dial plan for NPA 410]

NXX: 623

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
410-623 A Marion MD MARNMDMARS1  9212 VERIZON MARYLAND, INC. 242      
410-623 0 Marion MD   2593 CORE COMMUNICATIONS, INC.- MD 242      
410-623 1 Marion MD   145J TERRA NOVA TELECOM INC. 242      
410-623 2 Marion MD MARNMDMARS1  9212 VERIZON MARYLAND, INC. 242      
410-623 3 Marion MD SLBRMDSBXVX  876D ONVOY, LLC - MD 242      
410-623 5 Marion MD SLBRMD902MD  073H TELNYX LLC 242      
410-623 6 Marion MD   145J TERRA NOVA TELECOM INC. 242      
410-623 7 Marion MD SLBRMDSBXVX  876D ONVOY, LLC - MD 242      
410-623 8 Marion MD MARNMDMARS1  9212 VERIZON MARYLAND, INC. 242      
410-623 9 Marion MD   792K CHARTER IP ENABLED SERVICES, LLC 242      

Last updated: Wed, 20 Nov 2024 21:20:06 UTC

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.