what county is willow lake sd in
Location in Clark County and the state of South Dakota. Coordinates: 44Â°37â²40â³N 97Â°38â²17â³W / 44.62778Â°N 97.63806Â°W / 44.62778; -97.63806Coordinates: 44Â°37â²40â³N 97Â°38â²17â³W / 44.62778Â°N 97.63806Â°W / 44.62778; -97.63806. Willow Lake is a city in Clark County, South Dakota, United States. The population was 263 at the 2010 census. The city took its name from Willow Lake, a natural lake near the town site.