Riverton is a city in Fremont County, Wyoming, United States. It is both the largest city in the county and the largest within the historical boundaries of the Wind River Indian Reservation. The city's population was 10,615 at the 2010 census. The city is an incorporated entity of the state of Wyoming, on land ceded from the reservation in 1906, a situation that often makes it subject to jurisdictional claims by the nearby Eastern Shoshone and Northern Arapaho tribes.
According to the United States Census Bureau, the city has a total area of 9.8 square miles (25.3 km²), all of it land.