Dayton is a city and county seat in Rhea County, Tennessee, United States. As of the 2010 census, the city population was 7,191. The Dayton Urban Cluster, which includes developed areas adjacent to the city and extends south to Graysville, had 10,174 people in 2010.
Dayton was the site of the Scopes Trial in 1925 dealing with the creation–evolution controversy.
The community was originally settled circa 1820 as Smith's Crossroads. In 1877, the town was renamed Dayton, after Dayton, Ohio. The town was incorporated in 1903. Early industry included manufacture of pig iron.
In 1925, the famous Scopes Trial was held in Dayton and, for a period of time, filled the town with hucksters of every description and journalists from around the world. The participants included William Jennings Bryan in the role of prosecutor and Clarence Darrow as the principal defense counsel.