Marietta is a town in Cass County, Texas, United States, incorporated in 1963. The population was 134 at the 2010 census, up from 112 at the 2000 census; in 2020, its population was 115. Marietta is located in northwestern Cass County. It is 12 miles west of Douglassville, 9 miles east of Naples, and 16 miles northwest of Linden, the Cass County s…Marietta is a town in Cass County, Texas, United States, incorporated in 1963. The population was 134 at the 2010 census, up from 112 at the 2000 census; in 2020, its population was 115. Marietta is located in northwestern Cass County. It is 12 miles west of Douglassville, 9 miles east of Naples, and 16 miles northwest of Linden, the Cass County seat. According to the United States Census Bureau, the town of Marietta has a total area of 0.58 square miles, all land.