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: GDRPMIBL15Z

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
231-403 A Williamsburg MI 516C AT&T CORP. 348      
231-427 A Mackinaw City MI 516C AT&T CORP. 348      
231-793 A White Cloud MI 516C AT&T CORP. 348      
269-743 A Kalamazoo MI 516C AT&T CORP. 348      
269-753 A Battle Creek MI 516C AT&T CORP. 348      
269-787 A Athens MI 516C AT&T CORP. 348      
616-326 A Rockford MI 516C AT&T CORP. 348      
616-383 A Sparta MI 516C AT&T CORP. 348      
616-884 A Rockford MI 516C AT&T CORP. 348      

Last updated: Thu, 01 Jan 2026 03:59:49 UTC

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