Watertown is a town located in Wilson County, Tennessee. The population was 1,477 at the 2010 census. The population then raised to 1,556 after the 2020 census. It is located southeast of Lebanon, and northwest of Smithville.

Wilson County is a county in the U.S. state of Tennessee. It is in Middle Tennessee. As of the 2020 census, the population was 147,737. Its county seat is Lebanon. The largest city is Mt. Juliet. Wilson County is part of the Nashville-Davidson–Murfreesboro–Franklin, TN Metropolitan Statistical Area.