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: CHRTMDCHDS0

Remotes:

Switch Switch name Switch type
CCTNMDCLRS0  CECILTON  RSC 
CHCYMDCHRS0  CHESAPEAKE CITY  RSC 
CNVLMDCTRS2  CENTREVILLE  RS 
GALNMDGLRS0  GALENA  RSC 
MGTNMDMLRS0  MILLINGTON  RSC 
RKHLMDRHRS0  ROCK HALL  RSC 
SDVLMDSDRS0  SUDLERSVILLE  RSC 
STPNMDSPRS0  STILL POND  RSC 
NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
410-556 A Church Hill MD 9212 VERIZON MARYLAND, INC. 242      
410-778 A Chestertown MD 9212 VERIZON MARYLAND, INC. 242      
410-810 A Chestertown MD 9212 VERIZON MARYLAND, INC. 242      

Last updated: Thu, 01 Jan 2026 03:59:49 UTC

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