Nashville, IL has a population of 3,164 and is the 8,544th largest city in the United States. The population density is 1,164 per sq mi which is 424% higher than the Illinois average and 1185% higher than the national average. The median age in Nashville is 41 which is approximately 11% higher than the Illinois average of 37. In Nashville, 66% of the population over 15 years of age are married, 97% speak English and 1% speak Spanish. 82% of Nashville residents were born in Illinois, 15% were born out of state, 1% were born outside of the United States and 2% were foreign born.