Area Code 406-417 located in HELENA, LEWIS AND CLARK, MT, more detail is as below. Place NPA (Numbering Plan Area) : 406 NXX (Local Number Prefix) : 417 City : HELENA County : LEWIS AND CLARK State : MT (Montana) NXX Use Type : Wireless NXX Intro Version : 5/28/2008 FIPS (Federal Information Processing Standards) : 30049 LATA (Local Access Transport Area) : 648 Rate Center : HELENA ZIP Code Count : 0 ZIP Code Frequency : 0 ZIP Code : 59601 Other Information NPANXX : 406417 MSA CBSA (Core Based Statistical Area) : Helena, MT MSA CBSA Code (Core Based Statistical Area) : 25740 Time Zone : Mountain (GMT -07:00) Observes Daylight Saving Time : Yes Company : NEW CINGULAR WIRELESS PCS, LLC OCN (Operating Company Number) : 6010 Coverage Area Name : HELENA Latitude : 46.6012 Longitude : -112.0221 ‹ previous : 406-415 next › : 406-420 Telephone Number List 406-417-0000 ~ 406-417-9999