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: COVLILCQDS0

Remotes:

Switch Switch name Switch type
GLCRILGCRS0  GLEN CARBON  RSC 
MRINILMJRS0  MARINE  RSC 
TROYILTYRS0  TROY  RSC 
NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
618-343 A Collinsville IL 9329 ILLINOIS BELL TEL CO 520      
618-344 A Collinsville IL 9329 ILLINOIS BELL TEL CO 520      
618-345 A Collinsville IL 9329 ILLINOIS BELL TEL CO 520      
618-346 A Collinsville IL 9329 ILLINOIS BELL TEL CO 520      

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

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