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: FRDRMDFRDS0

Remotes:

Switch Switch name Switch type
BCTWMDBTRS1  BUCKEYSTOWN  EXM 
BRHGMDBHRS1  BRADDOCK HEIGHTS  EXM 
BRWKMDBRRS0  BRUNSWICK  5ER 
MTARMDMARS1  MOUNT AIRY  EXM 
MYVLMDMVRS0  MYERSVILLE  ORM 
NWMRMDNERS3  NEW MARKET  EXM 
NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
301-418 A Frederick MD 9212 VERIZON MARYLAND, INC. 240      
301-418 9 Frederick MD 9212 VERIZON MARYLAND, INC. 240   2003-01-11   

Last updated: Thu, 20 Nov 2025 13:34:34 UTC

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