Savanna is a city in Carroll County, Illinois, United States. The population was 2,783 at the 2020 census. Savanna is located along the Mississi…Savanna is a city in Carroll County, Illinois, United States. The population was 2,783 at the 2020 census. Savanna is located along the Mississippi River at the mouth of the Plum River. The region was once part of the vast hunting grounds of different native American tribes, including the Sauk. Following the Treaty of St. Louis and a number of additional treaties, land in Illinois along the Eastern bank of the Mississippi River was opened to settlement by farmers. Towns such as Savanna grew their commerce by using the river for efficient transport. Savanna's earliest settlers experienced some repercussions during the Black Hawk War in 1832.
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