Savanna is a city in Carroll County, Illinois, United States. The population was 2945 at the 2010 census, down from 3,542 at the 2000 census. Savanna is located within Carroll County which has a population of 15,387. Savanna is located along the Mississippi River at the mouth of the Plum River. Going from north to south, the second automobile bridge between Iowa and Illinois is located just north of Savanna, and is part of the U.S. Highway 52 route. The bridge leads to Sabula, Iowa, which is across the river from Savanna. U.S. Highway 52 goes through Savanna. Savanna is also served by two major Railroads, the Burlington Northern and Santa Fe Railway (BNSF) Railway Company and the (CP) Canadian Pacific. Savanna also has a small airport, The Tri-Township Airport (KSFY).