Glenwood, IL has a population of 8,853 and is the 4,332nd largest city in the United States. The population density is 2,749 per sq mi which is 1137% higher than the Illinois average and 2934% higher than the national average. The median age in Glenwood is 43 which is approximately 15% higher than the Illinois average of 37. In Glenwood, 51% of the population over 15 years of age are married, 93% speak English and 4% speak Spanish. 71% of Glenwood residents were born in Illinois, 24% were born out of state, 0% were born outside of the United States and 5% were foreign born.