Riverwoods, IL has a population of 3,759 and is the 7,721st largest city in the United States. The population density is 949 per sq mi which is 327% higher than the Illinois average and 948% higher than the national average. The median age in Riverwoods is 48 which is approximately 29% higher than the Illinois average of 37. In Riverwoods, 78% of the population over 15 years of age are married, 75% speak English and 5% speak Spanish. 65% of Riverwoods residents were born in Illinois, 16% were born out of state, 0% were born outside of the United States and 19% were foreign born.