Sunday Lake, MinnesotaSunday Lake is an unorganized territory located in Saint Louis County, Minnesota, United States. As of the 2000 census, its population was zero.GeographyAccording to the United States Census Bureau, the unorganized territory has a total area of 26.5 square miles ; 21.5 square miles is land and 5.1 square miles is water. The total area is 19.21% water.