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: WMNSMDWMDS0

Remotes:

Switch Switch name Switch type
HMPSMDHERS1  HAMPSTEAD ESS  EXM 
NWWNMDNWRS0  NEW WINDSOR  5ER 
SLRNMDSLRS0  SILVER RUN  5ER 
TNTWMDTNRS0  TANEYTOWN ESS  5ER 
UNBRMDUBRS0  UNION BRIDGE  5ER 
NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
410-386 A Westminster MD 9212 VERIZON MARYLAND, INC. 238      
410-840 A Reisterstown MD 9212 VERIZON MARYLAND, INC. 238      
410-848 A Westminster MD 9212 VERIZON MARYLAND, INC. 238      
410-857 A Westminster MD 9212 VERIZON MARYLAND, INC. 238      
410-871 A Westminster MD 9212 VERIZON MARYLAND, INC. 238      
410-875 A Sykesville MD 9212 VERIZON MARYLAND, INC. 238      
410-876 A Reisterstown MD 9212 VERIZON MARYLAND, INC. 238      

Last updated: Tue, 13 Jan 2026 21:50:02 UTC

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.