Parker is a city in Turner County, South Dakota, United States. The population was 1,022 at the 2010 census. It is the county seat of Turner County.
Parker is located at 43°23′50″N 97°8′14″W / 43.39722°N 97.13722°W / 43.39722; -97.13722 (43.397152, -97.137297).
According to the United States Census Bureau, the city has a total area of 0.9 square miles (2.4 km²), all of it land.