Walnut Grove is an unincorporated community in McDonough County, Illinois, United States. Walnut Grove Township was first settled in 1830. The town of Walnut Grove was laid out in 1870. It was originally created on a railroad line that passed through the area that no longer exists.
Notable person Kenneth G. McMillan, Illinois State Senator and educator, grew up near Walnut Grove, on a farm.'Illinois Blue Book 1981-1982,' Biographical Sketch of Kenneth G. McMillan, pg. 162
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