Nashville, often known as Music City, is the capital and most populous city in the U.S. state of Tennessee and the county seat of Davidson County. Located in Middle Tennessee, it had a population of 689,447 at the 2020 U.S. census.[d] Nashville is the 21st most populous city in the United States, and the fourth most populous city in the southeastern U.S. Located on the Cumberland River, the city is the center of the Nashville metropolitan area, and is one of the.