Kewanee is a city in Henry County, Illinois. "Kewanee" is the Winnebago word for greater prairie chicken, which lived there. The population wa…Kewanee is a city in Henry County, Illinois. "Kewanee" is the Winnebago word for greater prairie chicken, which lived there. The population was 12,509 in the 2020 census, down from 12,916 in 2010. According to the 2021 census gazetteer files, Kewanee has a total area of 6.61 square miles, of which 6.60 square miles is land and 0.01 square miles is water.
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