Oahe Acres is an unincorporated community and census-designated place in Hughes County, South Dakota, United States. It was first listed as a CDP prior to the 2020 census. The population of the CDP was 503 at the 2020 census. It is in the northwest part of the county, 7 miles north of Pierre, the state capital, and 2 miles east of Oahe Dam on the Missouri River.