Blue Island, IL has a population of 22,446 and is the 1,937th largest city in the United States. The population density is 5,513 per sq mi which is 2380% higher than the Illinois average and 5986% higher than the national average. The median age in Blue Island is 36 which is approximately 3% lower than the Illinois average of 37. In Blue Island, 43% of the population over 15 years of age are married, 59% speak English and 38% speak Spanish. 68% of Blue Island residents were born in Illinois, 10% were born out of state, 1% were born outside of the United States and 22% were foreign born.