Area Code 406-997 located in BILLINGS, YELLOWSTONE, MT, more detail is as below. Place NPA (Numbering Plan Area) : 406 NXX (Local Number Prefix) : 997 City : BILLINGS County : YELLOWSTONE State : MT (Montana) NXX Use Type : Wireless NXX Intro Version : 7/3/2008 FIPS (Federal Information Processing Standards) : 30111 LATA (Local Access Transport Area) : 650 Rate Center : GREATFALLS ZIP Code Count : 0 ZIP Code Frequency : 0 ZIP Code : 59102 Other Information NPANXX : 406997 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 : 365 WIRELESS, LLC OCN (Operating Company Number) : 551G Coverage Area Name : BILLINGS Latitude : 45.7774 Longitude : -108.5074 ‹ previous : 406-996 next › : 406-999 Telephone Number List 406-997-0000 ~ 406-997-9999