Ralston is a city in Carroll and Greene counties in the U.S. state of Iowa. The population was 81 at the time of the 2020 census.

Carroll County is a county located in the U.S. state of Iowa. As of the 2020 census, the population was 20,760. Its county seat is Carroll. The county is named in honor of Charles Carroll of Carrollton, signer of the Declaration of Independence.