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: CTVLMDCTDS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
410-455 A Catonsville MD 9212 VERIZON MARYLAND, INC. 238      
410-719 A Catonsville MD 9212 VERIZON MARYLAND, INC. 238      
410-744 A Catonsville MD 9212 VERIZON MARYLAND, INC. 238      
410-747 A Catonsville MD 9212 VERIZON MARYLAND, INC. 238      
410-788 A Catonsville MD 9212 VERIZON MARYLAND, INC. 238      
410-869 A Catonsville MD 9212 VERIZON MARYLAND, INC. 238      
443-612 A Catonsville MD 9212 VERIZON MARYLAND, INC. 238      

Last updated: Sat, 09 Mar 2019 02:16:03 UTC

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.