Glencoe, IL has a population of 8,870 and is the 4,322nd largest city in the United States. The population density is 2,385 per sq mi which is 973% higher than the Illinois average and 2533% higher than the national average. The median age in Glencoe is 45 which is approximately 19% higher than the Illinois average of 37. In Glencoe, 76% of the population over 15 years of age are married, 89% speak English and 3% speak Spanish. 60% of Glencoe residents were born in Illinois, 28% were born out of state, 1% were born outside of the United States and 12% were foreign born.