Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Blue Island is a city in Cook County, Illinois. The population was 22,556 at the 2010 census. Blue Island was established in the 1830s as a way station for settlers traveling on the Vincennes Trace, and the settlement prospered because it was conveniently situated a day's journey outside of Chicago. Since its founding, the city has been an important commercial center in the south Cook County region, although its position in that respect has been eclipsed in recent years as other significant population centers developed around it and the region's commercial resources became spread over a wider area.