Cross Plains is a city in Robertson County, Tennessee. The city's population was 1,789 at the 2020 census. Cross Plains was the first area of Robertson County that was settled by European settlers, with the arrival of Thomas Kilgore in 1778.

Robertson County is a county located on the central northern border of Tennessee in the United States. As of the 2020 United States Census, the population was 72,803 people. Its county seat is Springfield. The county was named for James Robertson, an explorer, founder of Nashville, and a state senator, who was often called the "Father of Middle Tennessee." Robertson County is a component of the Nashville-Davidson–Murfreesboro–Franklin, TN Metropolitan Statistical Area.