Glen Ellyn, IL has a population of 27,894 and is the 1,533rd largest city in the United States. The population density is 4,134 per sq mi which is 1760% higher than the Illinois average and 4463% higher than the national average. The median age in Glen Ellyn is 40 which is approximately 7% higher than the Illinois average of 37. In Glen Ellyn, 67% of the population over 15 years of age are married, 84% speak English and 5% speak Spanish. 62% of Glen Ellyn residents were born in Illinois, 24% were born out of state, 1% were born outside of the United States and 13% were foreign born.