Area Code 307-278 located in BUFFALO, JOHNSON, WY, more detail is as below. Place NPA (Numbering Plan Area) : 307 NXX (Local Number Prefix) : 278 City : BUFFALO County : JOHNSON State : WY (Wyoming) NXX Use Type : Landline NXX Intro Version : 2004-12-13 FIPS (Federal Information Processing Standards) : 56019 LATA (Local Access Transport Area) : 654 Rate Center : BUFFALO ZIP Code Count : 0 ZIP Code Frequency : Most frequently occurring ZIP Code, although percentage is unknown. ZIP Code : 82834 Other Information NPANXX : 307278 County Population : 0 Switch CLLI (Common Language Location Identifier) : CSPRWYMAUMD Time Zone : Mountain (GMT -07:00) Observes Daylight Saving Time : Yes Company : LEVEL 3 COMMUNICATIONS, LLC - WY OCN (Operating Company Number) : 9416 Coverage Area Name : BUFFALO Latitude : 44.3474 Longitude : -106.6897 ‹ previous : 307-277 next › : 307-279 Telephone Number List 307-278-0000 ~ 307-278-9999