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.

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NPA-NXX BLOCK Rate Centre Region Switch LATA LIR Eff date Disc date
847-999 2 Winnetka IL CHCGILWUX6X  358   2004-07-16   
872-210 1 Chicago Zone 04-Humboldt IL CHCGILWUX6X  358   2013-06-06   
872-241 8 Chicago Zone 02-Edgewater IL CHCGILWUX6X  358   2015-02-13   
872-315 4 Chicago Zone 04-Humboldt IL CHCGILWUX6X  358   2017-04-19   
872-469 1 Chicago Zone 03-Kildare IL CHCGILWUX6X  358   2015-05-11   
872-769 2 Chicago Zone 06-Kedzie IL CHCGILWUX6X  358   2017-04-04   
872-810 4 Chicago Zone 02-Edgewater IL CHCGILWUX6X  358   2015-08-14   
937-343 3 Fairborn OH DYTNOHKTLMD  328   2010-01-02   
937-668 A Dayton OH DYTNOHKTLMD  328      
937-668 0 Dayton OH DYTNOHKTLMD  328   2008-02-10   
937-702 1 Beavercreek OH DYTNOHKTLMD  328   2012-08-26   
947-269 A Rochester MI SFLDMIMKNMD  340      
947-269 0 Rochester MI SFLDMIMKNMD  340   2023-12-08   

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Last updated: Thu, 05 Feb 2026 23:41:55 UTC

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