Area Code 406-354 located in COHAGEN, GARFIELD, MT, more detail is as below. Place NPA (Numbering Plan Area) : 406 NXX (Local Number Prefix) : 354 City : COHAGEN County : GARFIELD State : MT (Montana) NXX Use Type : Landline NXX Intro Version : 1994-02-04 FIPS (Federal Information Processing Standards) : 30033 LATA (Local Access Transport Area) : 650 Rate Center : ROCK SPG ZIP Code Count : 2 ZIP Code Frequency : 2 ZIP Code : 59322 Other Information NPANXX : 406354 Switch CLLI (Common Language Location Identifier) : RCSPMTXCRS1 Time Zone : Mountain (GMT -07:00) Observes Daylight Saving Time : Yes Company : MID-RIVERS TELEPHONE COOPERATIVE, INC. OCN (Operating Company Number) : 2246 Coverage Area Name : ANGELA Latitude : 46.8332 Longitude : -106.2678 ‹ previous : 406-354 next › : 406-354 Telephone Number List 406-354-0000 ~ 406-354-9999