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.

Switch: CLTNMTXCRS1

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
406-244 A Potomac MT 2235 BLACKFOOT TEL. COOP., INC. 648      
406-246 A Dixon MT 2235 BLACKFOOT TEL. COOP., INC. 648      
406-677 A Seeley Lake MT 2235 BLACKFOOT TEL. COOP., INC. 648      
406-726 A Arlee MT 2235 BLACKFOOT TEL. COOP., INC. 648      
406-745 A St Ignatius MT 2235 BLACKFOOT TEL. COOP., INC. 648      
406-754 A Condon MT 2235 BLACKFOOT TEL. COOP., INC. 648      
406-793 A Ovando MT 2235 BLACKFOOT TEL. COOP., INC. 648      
406-825 A Clinton MT 2235 BLACKFOOT TEL. COOP., INC. 648      

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

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.