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.

Plains, MT

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
406-826 A PLNSMTXCRS1  2235 BLACKFOOT TEL. COOP., INC. 648      
406-826 0 PLNSMTXCRS1  2235 BLACKFOOT TEL. COOP., INC. 648      
406-826 1 CHRLMT010MD  986F WESTERN MONTANA COMMUNITYTEL INC. - MT 648   2013-08-25   
406-826 2 PLNSMTXCRS1  2235 BLACKFOOT TEL. COOP., INC. 648      
406-826 3 PLNSMTXCRS1  2235 BLACKFOOT TEL. COOP., INC. 648      
406-826 4 PLNSMTXCRS1  2235 BLACKFOOT TEL. COOP., INC. 648      
406-826 5 PLNSMTXCRS1  2235 BLACKFOOT TEL. COOP., INC. 648      
406-826 6 PLNSMTXCRS1  2235 BLACKFOOT TEL. COOP., INC. 648      
406-826 7   145J TERRA NOVA TELECOM INC. 648   2025-10-11   
406-826 8 MSSLMTMA0MD  9415 LEVEL 3 COMMUNICATIONS, LLC - MT 648   2016-06-27   
406-826 9 PLNSMTXCRS1  2235 BLACKFOOT TEL. COOP., INC. 648      

Last updated: Tue, 01 Sep 2026 00:40:05 UTC

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.