Joslin, IllinoisJoslin is an unincorporated community in Rock Island County, Illinois, United States and is located on Illinois Route 92 near Interstate 88.Tyson operates a beef slaughter plant in Joslin.HistoryThe Joslin Fairgrounds were the original site of the Rock Island County Fair, from the first fair in 1892 until the late 1920s.DemographicsJoslin first appeared as a census designated place in the 2020 U.S. census.EducationIt is in the Riverdale Community Unit School District 100.