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.

Switch: BRKLMDBKRP0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
410-350 A Baltimore MD 9212 VERIZON MARYLAND, INC. 238      
410-354 A Baltimore MD 9212 VERIZON MARYLAND, INC. 238      
410-355 A Baltimore MD 9212 VERIZON MARYLAND, INC. 238      
410-609 A Brooklyn Park-Linthicum MD 9212 VERIZON MARYLAND, INC. 238      
410-636 A Brooklyn Park-Linthicum MD 9212 VERIZON MARYLAND, INC. 238      
410-789 A Brooklyn Park-Linthicum MD 9212 VERIZON MARYLAND, INC. 238      
410-851 A Towson MD 9212 VERIZON MARYLAND, INC. 238      
443-792 A Brooklyn Park-Linthicum MD 9212 VERIZON MARYLAND, INC. 238      

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

Sponsored by: LES.NET

Like this site? We accept donations via PayPal.