According to the United States Census Bureau, Dickson has a total area of , of which is land and , or 0.41%, is water. The city center sits on the Tennessee Valley Divide, with the southwest side of the city draining via the East Piney River to the Piney River, then to the Duck River, and then to the Tennessee River, while the northeast side drains via Turnbull Creek or Jones Creek to the Harpeth River and thence to the Cumberland River.
According to the United States Census Bureau, Dickson, has a total area of , of which is land and , or 0.41%, is water The city center sits on the Tennessee Valley Divide, with the southwest side of the city draining via the East Piney River to the Piney River then to the Duck River, and then to the Tennessee River, while the northeast side drains via Turnbu.ll Creek or Jones Creek to the Harpeth River and thence to the Cumberland River.