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.

NPA: 406 [Rate centres in NPA 406] [Dial plan for NPA 406]

NXX: 527

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
406-527 A Saco MT SACOMTXCRS1  2247 NEMONT TEL COOP INC 650      
406-527 3 Saco MT   2247 NEMONT TEL COOP INC 650      
406-527 6 Saco MT   6010 NEW CINGULAR WIRELESS PCS, LLC 650   2021-07-27   
406-527 7 Saco MT   443B SAGEBRUSH CELLULAR, INC. 650      

Last updated: Tue, 13 Jan 2026 21:50:02 UTC

Sponsored by: LES.NET

Like this site? We accept donations via PayPal.