Williamson County is a county in the U.S. state of Tennessee. As of the 2020 United States census, the population was 247,726. The county seat is Franklin, and the county is located in Middle Tennessee. The county is named after Hugh Williamson, a North Carolina politician who signed the U.S. Constitution. Williamson County is part of the Nashville-Davidson–Murfreesboro–Franklin, TN Metropolitan Statistical Area. In the 19th century, tobacco and hemp were cultivated here, and planters also raised blooded livestock, including horses and cattle.

Franklin is a city in and the county seat of Williamson County, Tennessee, United States. About 21 miles (34 km) south of Nashville, it is one of the principal cities of the Nashville metropolitan area and Middle Tennessee. As of 2020, its population was 83,454. It is the seventh most populous city in Tennessee. Franklin is known to be the home of many celebrities, mostly country music stars.