Area Code 406-679 located in BILLINGS, YELLOWSTONE, MT, more detail is as below. Place NPA (Numbering Plan Area) : 406 NXX (Local Number Prefix) : 679 City : BILLINGS County : YELLOWSTONE State : MT (Montana) NXX Use Type : Wireless NXX Intro Version : 1994-02-04 FIPS (Federal Information Processing Standards) : 30111 LATA (Local Access Transport Area) : 650 Rate Center : HARDIN ZIP Code Count : 1 ZIP Code Frequency : 100 ZIP Code : 59106 Other Information NPANXX : 406679 Switch CLLI (Common Language Location Identifier) : BLNGMT233MD MSA CBSA (Core Based Statistical Area) : Billings, MT MSA CBSA Code (Core Based Statistical Area) : 13740 Time Zone : Mountain (GMT -07:00) Observes Daylight Saving Time : Yes Company : CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT OCN (Operating Company Number) : 6564 Coverage Area Name : HARDIN Latitude : 45.7347 Longitude : -107.5963 ‹ previous : 406-678 next › : 406-680 Telephone Number List 406-679-0000 ~ 406-679-9999