Goodwin is a town in Deuel County, South Dakota, United States, where the population was 147 at the 2020 census. Goodwin was platted in 1878, when the railroad was built into the area. The town was named for George P. Goodwin, a railroad official. A post office has been in operation in Goodwin since 1878. It is still running today. On May 30, 2022, the to…Goodwin is a town in Deuel County, South Dakota, United States, where the population was 147 at the 2020 census. Goodwin was platted in 1878, when the railroad was built into the area. The town was named for George P. Goodwin, a railroad official. A post office has been in operation in Goodwin since 1878. It is still running today. On May 30, 2022, the town was struck by a tornado that would damage many homes and businesses and would be rated EF3.