Area Code 406-340 located in FORSYTH, ROSEBUD, MT, more detail is as below. Place NPA (Numbering Plan Area) : 406 NXX (Local Number Prefix) : 340 City : FORSYTH County : ROSEBUD State : MT (Montana) NXX Use Type : Wireless NXX Intro Version : 1994-02-04 FIPS (Federal Information Processing Standards) : 30087 LATA (Local Access Transport Area) : 648 Rate Center : FORSYTH ZIP Code Count : 0 ZIP Code Frequency : Most frequently occurring ZIP Code, although percentage is unknown. ZIP Code : 59327 Other Information NPANXX : 406340 Switch CLLI (Common Language Location Identifier) : FRSYMT01CM1 Time Zone : Mountain (GMT -07:00) Observes Daylight Saving Time : Yes Company : MTPCS, LLC OCN (Operating Company Number) : 6922 Coverage Area Name : LIMA Latitude : 44.6412 Longitude : -112.5890 ‹ previous : 406-339 next › : 406-342 Telephone Number List 406-340-0000 ~ 406-340-9999