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 OCN LATA LIR Eff date Disc date
231-220 A Muskegon MI 2550 123.NET, LLC 348      
231-440 A Baldwin MI 2550 123.NET, LLC 348      
231-441 A Fife Lake MI 2550 123.NET, LLC 348      
231-488 A Manistee MI 2550 123.NET, LLC 348      
231-520 A Charlevoix MI 2550 123.NET, LLC 348      
231-522 A Luther MI 2550 123.NET, LLC 348      
231-538 A Fremont MI 2550 123.NET, LLC 348      
231-568 A Traverse City MI 2550 123.NET, LLC 348      
231-583 A Ludington MI 2550 123.NET, LLC 348      
231-614 A Pentwater MI 2550 123.NET, LLC 348      
231-635 A Mackinaw City MI 2550 123.NET, LLC 348      
231-636 A Howard City MI 2550 123.NET, LLC 348      
231-639 A Beulah MI 2550 123.NET, LLC 348      
231-643 A Morley MI 2550 123.NET, LLC 348      
231-656 A Kalkaska MI 2550 123.NET, LLC 348      
231-660 A Big Rapids MI 2550 123.NET, LLC 348      
231-686 A Frankfort MI 2550 123.NET, LLC 348      
231-721 A Hart MI 2550 123.NET, LLC 348      
231-731 A Shelby MI 2550 123.NET, LLC 348      
231-776 A Petoskey MI 2550 123.NET, LLC 348      
231-778 A Traverse City MI 2550 123.NET, LLC 348      
231-782 A Cheboygan MI 2550 123.NET, LLC 348      
231-792 A Mancelona MI 2550 123.NET, LLC 348      
231-806 A Coral MI 2550 123.NET, LLC 348      
231-808 A Central Lake MI 2550 123.NET, LLC 348      
231-813 A Ludington MI 2550 123.NET, LLC 348      
231-836 A Evart MI 2550 123.NET, LLC 348      
231-842 A Cadillac MI 2550 123.NET, LLC 348      
231-874 A Wolverine MI 2550 123.NET, LLC 348      
231-877 A Northport MI 2550 123.NET, LLC 348      
231-899 A Northport MI 2550 123.NET, LLC 348      
231-908 A McBain MI 2550 123.NET, LLC 348      
231-925 A Scottville MI 2550 123.NET, LLC 348      
231-974 A Grant MI 2550 123.NET, LLC 348      
269-315 A Vicksburg MI 2550 123.NET, LLC 348      
269-680 A Plainwell MI 2550 123.NET, LLC 348      
517-736 A Coldwater MI 2550 123.NET, LLC 348      
616-212 A Holland MI 2550 123.NET, LLC 348      
616-608 A Grand Rapids MI 2550 123.NET, LLC 348      

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

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