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: CLMAMDOBDS0

Remotes:

Switch Switch name Switch type
CLMAMDSRRS0  COLUMBIA SNOWDEN RIVER  ORM 
GLWDMDGDRS1  GLENWOOD  EXM 
NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
301-310 A Laurel (Baltimore LATA) MD 9212 VERIZON MARYLAND, INC. 238      
410-290 A Columbia MD 9212 VERIZON MARYLAND, INC. 238      
410-309 A Columbia MD 9212 VERIZON MARYLAND, INC. 238      
410-381 A Columbia MD 9212 VERIZON MARYLAND, INC. 238      
410-505 A Ellicott City MD 9212 VERIZON MARYLAND, INC. 238      
443-259 A Columbia MD 9212 VERIZON MARYLAND, INC. 238      

Last updated: Sat, 23 Mar 2019 01:32:05 UTC

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.