Demopolis is the largest city in Marengo County, in west-central Alabama. The population was 7,162 at the 2020 census. The city lies at the con…Demopolis is the largest city in Marengo County, in west-central Alabama. The population was 7,162 at the 2020 census. The city lies at the confluence of the Black Warrior River and Tombigbee River. It is situated atop a cliff composed of the Demopolis Chalk Formation, known locally as White Bluff, on the east bank of the Tombigbee. It is at the center of Alabama's Canebrake region and is also within the Black Belt region.
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