Harrold is a town in Hughes County, South Dakota, United States. It is part of the Pierre, South Dakota Micropolitan Statistical Area. The population was 101 at the 2020 census. The first settlement at Harrold was made in 1881. A post office was established as Harold in 1882, and the name was changed to Harrold in 1890. The town was named in honor of a railro…Harrold is a town in Hughes County, South Dakota, United States. It is part of the Pierre, South Dakota Micropolitan Statistical Area. The population was 101 at the 2020 census. The first settlement at Harrold was made in 1881. A post office was established as Harold in 1882, and the name was changed to Harrold in 1890. The town was named in honor of a railroad official.