Marengo County, Alabama
![](/Images/godic/202501/26/Marengo_Alabama_Courthouse4909.jpg")
![Map of Alabama highlighting Marengo County](/Images/godic/202501/26/Map_of_Alabama_highlighting_Marengo_County.svg4909.png")
![Map of the United States highlighting Alabama](/Images/godic/202501/26/Map_of_USA_AL.svg4909.png")
![Barney's Upper Place, an I-house in Putnam that was built in 1833.](/Images/godic/202501/26/Barney_Upper_Place4909.jpg")
Marengo County is a county of the U.S. state of Alabama. As of the 2010 census, the population was 21,027. The largest city is Demopolis and the county seat is Linden. It is named in honor of the battlefield of the site of Battle of Marengo near Turin, Italy, where the Napoleon Bonaparte defeated the Austrians on June 14, 1800.