Calumet City, IL has a population of 37,112 and is the 1,120th largest city in the United States. The population density is 5,168 per sq mi which is 2167% higher than the Illinois average and 5604% higher than the national average. The median age in Calumet City is 36 which is approximately 3% lower than the Illinois average of 37. In Calumet City, 41% of the population over 15 years of age are married, 85% speak English and 12% speak Spanish. 71% of Calumet City residents were born in Illinois, 19% were born out of state, 0% were born outside of the United States and 10% were foreign born.