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Walnut is a village in Bureau County, Illinois, United States. The residents of Walnut are known as "Walnutions" a unique demonym. The population was 1,311 at the 2020 census, down from 1,416 at the 2010 census and 1,461 at the 2000 census. It is part of the Ottawa Micropolitan Statistical Area. The village was incorporated on October 26, 1876.