Marianna is a city in and the county seat of Lee County, Arkansas, United States, along the L'Anguille River. The community was established by Col. Walter H. Otey in 1848 and was known as Walnut Ridge until 1852 when it became known as Marianna. According to the United States Census Bureau, the city has a total area of 3.6 square miles 9.3 square kilometer, all of it land. The town's current mayor is Hon. Mayor Jimmy Williams who took office on Jan. 1, 2011.