Area Code 406-992 located in HELENA, LEWIS AND CLARK, MT, more detail is as below. Place NPA (Numbering Plan Area) : 406 NXX (Local Number Prefix) : 992 City : HELENA County : LEWIS AND CLARK State : MT (Montana) NXX Use Type : Landline 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 : 59626 Other Information NPANXX : 406992 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 : YMAX COMMUNICATIONS CORP. - MT OCN (Operating Company Number) : 357E Coverage Area Name : HELENA Latitude : 46.5896 Longitude : -112.0391 ‹ previous : 406-991 next › : 406-993 Telephone Number List 406-992-0000 ~ 406-992-9999