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      
410-869 0 Catonsville MD 9212 VERIZON MARYLAND, INC. 238      
410-869 1 Catonsville MD 9212 VERIZON MARYLAND, INC. 238      
410-869 3 Catonsville MD 9212 VERIZON MARYLAND, INC. 238      
410-869 4 Catonsville MD 9212 VERIZON MARYLAND, INC. 238      
410-869 7 Catonsville MD 9212 VERIZON MARYLAND, INC. 238      
410-869 8 Catonsville MD 9212 VERIZON MARYLAND, INC. 238      
410-869 9 Catonsville MD 9212 VERIZON MARYLAND, INC. 238      
443-612 A Catonsville MD 9212 VERIZON MARYLAND, INC. 238      
443-840 1 Catonsville MD 9212 VERIZON MARYLAND, INC. 238   2008-07-10   
443-840 2 Catonsville MD 9212 VERIZON MARYLAND, INC. 238   2008-07-10   
443-840 3 Catonsville MD 9212 VERIZON MARYLAND, INC. 238   2008-07-10   
443-840 4 Catonsville MD 9212 VERIZON MARYLAND, INC. 238   2008-07-10   
443-840 5 Catonsville MD 9212 VERIZON MARYLAND, INC. 238   2008-07-10   

Last updated: Tue, 16 Apr 2024 01:38:01 UTC

Sponsored by: VoIP.ms

Like this site? We accept donations via PayPal.