Demopolis is a city located in Marengo County, Alabama, United States. It was founded in 1817 and is known for its rich history and cultural heritage. The city is situated at the confluence of the Black Warrior River and the Tombigbee River, making it an important location for trade and transportation. The population of Demopolis is approximately 7,500 residents. The city hosts several annual events, including the Demopolis Watermelon Festival, which celebrates the local agriculture. Additionally, Demopolis is home to historic sites such as the Demopolis Historic District, showcasing its architectural significance and charm.