Riverton is a city in Fremont County, Wyoming, United States. The city's population was 10,682 at the 2020 census, making it the most populous city in the county.

Fremont County is a county in the U.S. state of Wyoming. As of the 2020 United States census, the population was 39,234, making it the fifth-most populous county in Wyoming. Its county seat is Lander. The county was founded in 1884 and is named for John C. Frémont, a general, explorer, and politician. It is roughly the size of the state of Vermont.