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.
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Switch: CHFDILXERS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
618-753 A Chesterfield-Rockbridge IL 1183 CITIZENS TELECOM CO ILLINOIS-FRONTIER CITIZENS -IL 520      
618-753 0 Chesterfield-Rockbridge IL 1183 CITIZENS TELECOM CO ILLINOIS-FRONTIER CITIZENS -IL 520      
618-753 1 Chesterfield-Rockbridge IL 1183 CITIZENS TELECOM CO ILLINOIS-FRONTIER CITIZENS -IL 520      
618-753 2 Chesterfield-Rockbridge IL 1183 CITIZENS TELECOM CO ILLINOIS-FRONTIER CITIZENS -IL 520      
618-753 3 Chesterfield-Rockbridge IL 1183 CITIZENS TELECOM CO ILLINOIS-FRONTIER CITIZENS -IL 520      
618-753 9 Chesterfield-Rockbridge IL 1183 CITIZENS TELECOM CO ILLINOIS-FRONTIER CITIZENS -IL 520      

Last updated: Tue, 07 Oct 2025 16:47:53 UTC

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