'Lake County, SD' definitions:

Lake -- U.S. County in South Dakota

From: Gazetteer 2000
Name :
Lake -- U.S. County in South Dakota
Population (2000) :
11276
Housing Units (2000) :
5282
Land area (2000) :
563.228625 sq. miles (1458.755381 sq. km)
Water area (2000) :
11.827532 sq. miles (30.633165 sq. km)
Total area (2000) :
575.056157 sq. miles (1489.388546 sq. km)
Located within :
South Dakota (SD), FIPS 46
Location :
44.019761 N, 97.099990 W