Area Code 307-239 located in RIVERTON, FREMONT, WY, more detail is as below. Place NPA (Numbering Plan Area) : 307 NXX (Local Number Prefix) : 239 City : RIVERTON County : FREMONT State : WY (Wyoming) FIPS (Federal Information Processing Standards) : 56013 Rate Center : RIVERTON ZIP Code Count : 0 ZIP Code Frequency : Most frequently occurring ZIP Code, although percentage is unknown. ZIP Code : 82501 Other Information NPANXX : 307239 County Population : 0 Switch CLLI (Common Language Location Identifier) : CSPRWYDHDS0 MSA CBSA (Core Based Statistical Area) : Riverton, WY MSA CBSA Code (Core Based Statistical Area) : 40180 Time Zone : Mountain (GMT -07:00) Observes Daylight Saving Time : Yes Latitude : None Longitude : None ‹ previous : 307-238 next › : 307-240 Telephone Number List 307-239-0000 ~ 307-239-9999