Area Code 406-398 located in BIG SANDY, CHOUTEAU, MT, more detail is as below. Place NPA (Numbering Plan Area) : 406 NXX (Local Number Prefix) : 398 City : BIG SANDY County : CHOUTEAU State : MT (Montana) NXX Use Type : Landline NXX Intro Version : 1994-02-04 FIPS (Federal Information Processing Standards) : 30015 LATA (Local Access Transport Area) : 648 Rate Center : NORTHHAVRE ZIP Code Count : 1 ZIP Code Frequency : 2 ZIP Code : 59520 Other Information NPANXX : 406398 Switch CLLI (Common Language Location Identifier) : NHVRMTXCRS1 Time Zone : Mountain (GMT -07:00) Observes Daylight Saving Time : Yes Company : TRIANGLE TELEPHONE COOPERATIVE ASSN., INC. OCN (Operating Company Number) : 2257 Coverage Area Name : HAVRE Latitude : 48.8026 Longitude : -109.6839 ‹ previous : 406-397 next › : 406-398 Telephone Number List 406-398-0000 ~ 406-398-9999