Area Code 406-204 located in HELENA, LEWIS AND CLARK, MT, more detail is as below. Place NPA (Numbering Plan Area) : 406 NXX (Local Number Prefix) : 204 City : HELENA County : LEWIS AND CLARK State : MT (Montana) NXX Use Type : Landline NXX Intro Version : 2001-06-30 FIPS (Federal Information Processing Standards) : 30049 LATA (Local Access Transport Area) : 648 Rate Center : HELENA ZIP Code Count : 0 ZIP Code Frequency : Most frequently occurring ZIP Code, although percentage is unknown. ZIP Code : 59601 Other Information NPANXX : 406204 Switch CLLI (Common Language Location Identifier) : HLNAMTMAIMD 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 : LEVEL 3 COMMUNICATIONS, LLC - MT OCN (Operating Company Number) : 9415 Coverage Area Name : HELENA Latitude : 46.5932 Longitude : -112.0313 ‹ previous : 406-204 next › : 406-205 Telephone Number List 406-204-0000 ~ 406-204-9999