Area Code 406-203 located in MISSOULA, MISSOULA, MT, more detail is as below. Place NPA (Numbering Plan Area) : 406 NXX (Local Number Prefix) : 203 City : MISSOULA County : MISSOULA State : MT (Montana) NXX Use Type : Landline NXX Intro Version : 2001-06-30 FIPS (Federal Information Processing Standards) : 30063 LATA (Local Access Transport Area) : 648 Rate Center : MISSOULA ZIP Code Count : 0 ZIP Code Frequency : Most frequently occurring ZIP Code, although percentage is unknown. ZIP Code : 59802 Other Information NPANXX : 406203 Switch CLLI (Common Language Location Identifier) : MSSLMTMA6MD MSA CBSA (Core Based Statistical Area) : Missoula, MT MSA CBSA Code (Core Based Statistical Area) : 33540 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 : MISSOULA Latitude : 46.8717 Longitude : -113.9931 ‹ previous : 406-203 next › : 406-204 Telephone Number List 406-203-0000 ~ 406-203-9999