Green River
- County:
- Sweetwater County
- County Seat:
- Yes
- Area (mi²):
- 13.808
- State:
- Wyoming
Green River is a city located in Sweetwater County, Wyoming. Green River has a 2026 population of 11,474. It is also the county seat of Sweetwater County. Green River is currently declining at a rate of -0.23% annually and its population has decreased by -2.83% since the most recent census, which recorded a population of 11,808 in 2020.