Wood River is a city located in Madison County, Illinois. It is a suburb of St. Louis, Missouri and is situated along the Mississippi River. The city has a population of approximately 10,500 residents as of the 2020 census. Wood River was originally known for its oil refineries and industrial presence, but has since diversified its economy. The city offers a mix of residential neighborhoods, commercial areas, and recreational facilities, including several parks and the Wood River Aquatic Center.