Nashville is a city in Washington County, Illinois, in the United States. As of the 2000 census, the city population was 3,147. It is the county seat of Washington County.
Nashville is located at 38°20′53″N 89°22′54″W / 38.34806°N 89.38167°W / 38.34806; -89.38167 (38.348076, -89.381660).
According to the United States Census Bureau, the city has a total area of 2.8 square miles (7.2 km²), of which, 2.7 square miles (6.9 km²) of it is land and 0.1 square miles (0.2 km²) of it (3.25%) is water.