Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
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NPA: 231 [Rate centres in NPA 231] [Dial plan for NPA 231]

NXX: 552

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
231-552 A Charlevoix MI   2964 OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 348   2025-09-21   
231-552 2 Charlevoix MI   145J TERRA NOVA TELECOM INC. 348   2025-10-12   
231-552 9 Charlevoix MI   2964 OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 348   2025-09-21   

Last updated: Thu, 16 Oct 2025 03:04:18 UTC

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