Riverton is a city in Fremont County, Iowa, United States, along the East Nishnabotna River. The population was 245 at the time of the 2020 census.

Fremont County is a county located in the U.S. state of Iowa. As of the 2020 census the population was 6,605, making it the state's seventh-least populous county. The county seat is Sidney. The county was formed in 1847 and named for the military officer John C. Frémont.