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: CRLKILCKDS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
815-356 A Crystal Lake IL 9329 ILLINOIS BELL TEL CO 358      
815-444 A Crystal Lake IL 9329 ILLINOIS BELL TEL CO 358      
815-455 A Crystal Lake IL 9329 ILLINOIS BELL TEL CO 358      
815-459 A Crystal Lake IL 9329 ILLINOIS BELL TEL CO 358      
815-477 A Crystal Lake IL 9329 ILLINOIS BELL TEL CO 358      
815-479 A Crystal Lake IL 9329 ILLINOIS BELL TEL CO 358      
815-479 0 Crystal Lake IL 9329 ILLINOIS BELL TEL CO 358      
815-479 1 Crystal Lake IL 9329 ILLINOIS BELL TEL CO 358      
815-479 2 Crystal Lake IL 9329 ILLINOIS BELL TEL CO 358      
815-479 5 Crystal Lake IL 9329 ILLINOIS BELL TEL CO 358      
815-479 6 Crystal Lake IL 9329 ILLINOIS BELL TEL CO 358      
815-479 7 Crystal Lake IL 9329 ILLINOIS BELL TEL CO 358      
815-479 8 Crystal Lake IL 9329 ILLINOIS BELL TEL CO 358      
815-479 9 Crystal Lake IL 9329 ILLINOIS BELL TEL CO 358      
815-788 A Crystal Lake IL 9329 ILLINOIS BELL TEL CO 358      
815-788 0 Crystal Lake IL 9329 ILLINOIS BELL TEL CO 358      
815-788 1 Crystal Lake IL 9329 ILLINOIS BELL TEL CO 358      
815-788 2 Crystal Lake IL 9329 ILLINOIS BELL TEL CO 358      
815-788 3 Crystal Lake IL 9329 ILLINOIS BELL TEL CO 358      
815-788 5 Crystal Lake IL 9329 ILLINOIS BELL TEL CO 358      
815-788 7 Crystal Lake IL 9329 ILLINOIS BELL TEL CO 358      
815-788 8 Crystal Lake IL 9329 ILLINOIS BELL TEL CO 358      
815-788 9 Crystal Lake IL 9329 ILLINOIS BELL TEL CO 358      

Last updated: Wed, 20 Nov 2024 21:20:06 UTC

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