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: HAVRMTXCDS0

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NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
406-462 A Winifred MT 2257 TRIANGLE TEL. COOP. ASSN., INC. 648      
406-658 A South Malta MT 2257 TRIANGLE TEL. COOP. ASSN., INC. 648      
406-674 A Whitewater MT 2257 TRIANGLE TEL. COOP. ASSN., INC. 648      
406-674 0 Whitewater MT 2257 TRIANGLE TEL. COOP. ASSN., INC. 648      
406-674 1 Whitewater MT 2257 TRIANGLE TEL. COOP. ASSN., INC. 648      
406-674 2 Whitewater MT 2257 TRIANGLE TEL. COOP. ASSN., INC. 648      
406-674 3 Whitewater MT 2257 TRIANGLE TEL. COOP. ASSN., INC. 648      
406-674 4 Whitewater MT 2257 TRIANGLE TEL. COOP. ASSN., INC. 648      
406-674 5 Whitewater MT 2257 TRIANGLE TEL. COOP. ASSN., INC. 648      
406-674 6 Whitewater MT 2257 TRIANGLE TEL. COOP. ASSN., INC. 648      
406-674 7 Whitewater MT 2257 TRIANGLE TEL. COOP. ASSN., INC. 648      
406-674 8 Whitewater MT 2257 TRIANGLE TEL. COOP. ASSN., INC. 648      
406-674 9 Whitewater MT 2257 TRIANGLE TEL. COOP. ASSN., INC. 648      
406-739 A Loma MT 2257 TRIANGLE TEL. COOP. ASSN., INC. 648      
406-759 A Chester MT 2257 TRIANGLE TEL. COOP. ASSN., INC. 648      
406-759 5 Chester MT 2257 TRIANGLE TEL. COOP. ASSN., INC. 648      
406-759 6 Chester MT 2257 TRIANGLE TEL. COOP. ASSN., INC. 648      
406-759 8 Chester MT 2257 TRIANGLE TEL. COOP. ASSN., INC. 648      

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Last updated: Sun, 17 May 2026 03:26:51 UTC

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