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Phone Directory 406-634 Detail

State Major City Time Zone
Montana Billings Mountain

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Area Code Prefixes

Prefix Primary City Company County Usage Introduced
406-634 Helena, MT AT&T Local Lewis And Clark Landline 08/20/2000

Other Series For Prefixes

406-6340###
406-6341###
406-6342###
406-6343###
406-6344###
406-6345###
406-6346###
406-6347###
406-6348###
406-6349###