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Phone Directory 406-440 Detail

State Major City Time Zone
Montana Billings Mountain

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Example: (406) 440-5555 or 2012145555

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Area Code Prefixes

Prefix Primary City Company County Usage Introduced
406-440 Helena, MT 3 Rivers Telephone Cooperative Lewis And Clark Landline 07/01/2005

Other Series For Prefixes

406-4400###
406-4401###
406-4402###
406-4403###
406-4404###
406-4405###
406-4406###
406-4407###
406-4408###
406-4409###