Nashville
- County:
- Washington County
- County Seat:
- Yes
- Area (mi²):
- 3.105
- State:
- Illinois
Nashville is a city located in Washington County, Illinois. Nashville has a 2026 population of 3,006. It is also the county seat of Washington County. Nashville is currently declining at a rate of -0.63% annually and its population has decreased by -2.94% since the most recent census, which recorded a population of 3,097 in 2020.