Stark County is a county located in the U.S. state of Illinois. According to the 2010 census, it had a population of 5,994. Its county seat is Toulon.Stark County is part of the Peoria, IL Metropolitan Statistical Area.HistoryStark County was formed in 1839 out of Knox and Putnam counties. It was named for General Colonel John Stark,(August 28, 1728 - May 8, 1822) who served in the American Continental Army during the American Revolutionary War. He became widely known as the "Hero of Bennington" for his exemplary service at the Battle of Bennington in 1777. In the latter part of April, 1829 a solitary, heavily laden wagon was wending its way from the hospitable home of Mr. French, at Prince's Grove, about a half mile north-west of the present town of Princeville, towards Spoon River, probably crossing that stream at a point since known as Boardman's Ford, or, as others think, near the seat of Cox's Mill, and moving on towards section fifteen in what has since been known as Essex Township.The weather was warm and balmy considering the season. The prairie burnt over by the Indians in the fall was already green with sprouting grass. Accompanying this vehicle were as it might seem a guard of good men, and true; "neighbors" they called themselves, although they must have lived many miles apart, some of them thirty or forty from the scene of their present friendly labors, having come from LaSalle Prairie, from Chillicothe and Peoria. They were neither hunters or warriors, they feared no enemy, and sought not the "spoils of war".