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.

OCN: 2249 CENTURYTEL OF MONTANA, INC. DBA CENTURYLINK

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NPA-NXX BLOCK Rate Centre Region Switch LATA LIR Eff date Disc date
406-886 A Swan Lake MT SWLKMTXCRS0  648      
406-886 2 Swan Lake MT SWLKMTXCRS0  648      
406-886 3 Swan Lake MT SWLKMTXCRS0  648      
406-887 A Finley Point MT FNPTMTXCRS0  648      
406-887 2 Finley Point MT FNPTMTXCRS0  648      
406-887 3 Finley Point MT FNPTMTXCRS0  648      
406-892 A Columbia Falls MT CLFLMTXCRS0  648      
406-982 A Yellow Bay MT YLBYMTXCRS0  648      
406-982 2 Yellow Bay MT YLBYMTXCRS0  648      
406-982 3 Yellow Bay MT YLBYMTXCRS0  648      

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Last updated: Sat, 10 Oct 2026 15:24:20 UTC

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