Nashville is a city in Washington County, Illinois, United States. As of the 2020 census, the city population was 3,105. It is the county seat of W…Nashville is a city in Washington County, Illinois, United States. As of the 2020 census, the city population was 3,105. It is the county seat of Washington County. According to the 2010 census, Nashville has a total area of 2.809 square miles, of which 2.72 square miles is land and 0.089 square miles is water.
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