Schaumburg, IL has a population of 74,366 and is the 478th largest city in the United States. The population density is 3,856 per sq mi which is 1635% higher than the Illinois average and 4156% higher than the national average. The median age in Schaumburg is 38 which is approximately 1% higher than the Illinois average of 37. In Schaumburg, 60% of the population over 15 years of age are married, 62% speak English and 7% speak Spanish. 56% of Schaumburg residents were born in Illinois, 14% were born out of state, 1% were born outside of the United States and 29% were foreign born.