The village of Coal Valley is located in both Rock Island County and Henry County in the U.S. state of Illinois. The population was 3,873 at the time of the 2020 census, up from 3,743 at the 2010 census. It is mostly residential, housing families who work in or out of the greater Quad Cities Area and is considered a suburb. The students of the Rock Island County part of Coal Valley attend the Moline-Coal Valley School District, and in the Henry County portion, Orion Community Unit School District 223