Round Lake is a city in Nobles County, Minnesota, United States. The population was 376 at the 2010 census. According to the United Stat…Round Lake is a city in Nobles County, Minnesota, United States. The population was 376 at the 2010 census. According to the United States Census Bureau, the city has a total area of 1.04 square miles, of which 1.03 square miles is land and 0.01 square miles is water. A lake, also called Round Lake, is just outside the city to the northeast. The town of Round Lake is located in the extreme southeast corner of Nobles County. It lies one-half miles west of the Jackson County line, and two miles north of Iowa.
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