Marengo County is situated in the west-central area of the state.
 
According to the U.S. Census Bureau, the county has a total area of 983 square miles (2,550 km²), of which 977 square miles (2,530 km²) is land and 5.8 square miles (15 km²) (0.6%) is water.
The entire western county border is formed by the Tombigbee River and a small northwestern portion is formed by the Black Warrior River.
Marengo County is situated in the west-central area of the state.  
According to the U.S. Census Bureau, the county has a total area of 983 square miles (2,550 km²), of which 977 square miles (2,530 km²) is land and 5.8 square miles (15 km²) (0.6%) is water. The entire western county border is formed by the Tombigbee River and a small northwestern portion is formed by the Black Warrior River.
Marengo County, Alabama