Area Code 307-420 located in JACKSON, TETON, WY, more detail is as below. Place NPA (Numbering Plan Area) : 307 NXX (Local Number Prefix) : 420 City : JACKSON County : TETON State : WY (Wyoming) NXX Use Type : Landline NXX Intro Version : 2005-10-13 FIPS (Federal Information Processing Standards) : 56039 ZIP Code Count : 0 ZIP Code Frequency : Most frequently occurring ZIP Code, although percentage is unknown. ZIP Code : 83001 Other Information NPANXX : 307420 County Population : 0 MSA CBSA (Core Based Statistical Area) : Jackson, WY-ID MSA CBSA Code (Core Based Statistical Area) : 27220 Time Zone : Mountain (GMT -07:00) Observes Daylight Saving Time : Yes Latitude : None Longitude : None ‹ previous : 307-417 next › : 307-421 Telephone Number List 307-420-0000 ~ 307-420-9999