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.

Copemish Thompsonville, MI

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
231-378 A MSCKMIXIRS0  0704 ACE TEL. CO. OF MICHIGAN, INC. 348      

Last updated: Mon, 15 Sep 2025 02:24:40 UTC

Sponsored by: BeeVox - Whitelabel Reseller Platform

Like this site? We accept donations via PayPal.