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: RNLKILRLDS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
847-201 1 Round Lake IL 9329 ILLINOIS BELL TEL CO 358   2000-02-07   
847-201 7 Round Lake IL 9329 ILLINOIS BELL TEL CO 358   2000-02-07   
847-201 8 Round Lake IL 9329 ILLINOIS BELL TEL CO 358   2000-02-07   
847-270 A Round Lake IL 9329 ILLINOIS BELL TEL CO 358      
847-270 0 Round Lake IL 9329 ILLINOIS BELL TEL CO 358      
847-270 2 Round Lake IL 9329 ILLINOIS BELL TEL CO 358      
847-270 3 Round Lake IL 9329 ILLINOIS BELL TEL CO 358      
847-270 4 Round Lake IL 9329 ILLINOIS BELL TEL CO 358      
847-270 5 Round Lake IL 9329 ILLINOIS BELL TEL CO 358      
847-270 6 Round Lake IL 9329 ILLINOIS BELL TEL CO 358      
847-270 9 Round Lake IL 9329 ILLINOIS BELL TEL CO 358      
847-546 A Round Lake IL 9329 ILLINOIS BELL TEL CO 358      
847-740 A Round Lake IL 9329 ILLINOIS BELL TEL CO 358      

Last updated: Tue, 29 Sep 2026 03:00:13 UTC

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