Sheldon is a village in Sheldon Township, Iroquois County, Illinois, United States. The population was 965 at the 2020 census. Sheldon is located in eastern Iroquois County at 40°46′15″N 87°33′53″W / 40.770894°N 87.564802°W. U.S. Route 24 runs along the northern edge of the village, leading west 9 miles to Watseka, the Iroquois county seat, and east …Sheldon is a village in Sheldon Township, Iroquois County, Illinois, United States. The population was 965 at the 2020 census. Sheldon is located in eastern Iroquois County at 40°46′15″N 87°33′53″W / 40.770894°N 87.564802°W. U.S. Route 24 runs along the northern edge of the village, leading west 9 miles to Watseka, the Iroquois county seat, and east 6 miles to Kentland, Indiana. U.S. Route 52 intersects US 24 along Sheldon's northern border, leading north 3.5 miles to Iroquois and east with US 24 into Indiana.