Green River is a city located in Sweetwater County Wyoming. It is also the county seat of Sweetwater County. With a 2020 population of 11,439, it is the 8th largest city in Wyoming and the 2830th largest city in the United States . Green River is currently declining at a rate of -1.38% annually and its population has decreased by -8.60% since the most recent census, which recorded a population of 12,515 in 2010. Green River reached it's highest population of in . Spanning over 14 miles, Green River has a population density of 835 people per square mile.
The average household income in Green River is $89,497 with a poverty rate of 8.99%. The median rental costs in recent years comes to $895 per month, and the median house value is $213,800. The median age in Green River is 37.3 years, 36.7 years for males, and 38.6 years for females.