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.

Plentywood, MT

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
406-765 A PLWDMTXCDS0  2247 NEMONT TEL COOP INC 650      
406-765 1   2247 NEMONT TEL COOP INC 650      
406-765 2   2247 NEMONT TEL COOP INC 650      
406-765 3   2247 NEMONT TEL COOP INC 650      
406-765 5   9415 LEVEL 3 COMMUNICATIONS, LLC - MT 650   2023-08-29   
406-765 6   771G TELEPORT COMMUNICATIONS AMERICA MT - LLC 650   2021-05-04   
406-765 7   443B SAGEBRUSH CELLULAR, INC. 650      
406-765 8   443B SAGEBRUSH CELLULAR, INC. 650      
406-765 9   2247 NEMONT TEL COOP INC 650      

Last updated: Thu, 29 Jan 2026 14:35:03 UTC

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.