Area Code 307-244 located in GREEN RIVER, SWEETWATER, WY, more detail is as below. Place NPA (Numbering Plan Area) : 307 NXX (Local Number Prefix) : 244 City : GREEN RIVER County : SWEETWATER State : WY (Wyoming) FIPS (Federal Information Processing Standards) : 56037 Rate Center : GREENRIVER ZIP Code Count : 0 ZIP Code Frequency : Most frequently occurring ZIP Code, although percentage is unknown. ZIP Code : 82935 Other Information NPANXX : 307244 County Population : 0 Switch CLLI (Common Language Location Identifier) : CSPRWYDHDS0 MSA CBSA (Core Based Statistical Area) : Rock Springs, WY MSA CBSA Code (Core Based Statistical Area) : 40540 Time Zone : Mountain (GMT -07:00) Observes Daylight Saving Time : Yes Latitude : None Longitude : None ‹ previous : 307-243 next › : 307-245 Telephone Number List 307-244-0000 ~ 307-244-9999