Des Plaines, IL has a population of 58,755 and is the 672nd largest city in the United States. The population density is 4,096 per sq mi which is 1743% higher than the Illinois average and 4421% higher than the national average. The median age in Des Plaines is 43 which is approximately 14% higher than the Illinois average of 37. In Des Plaines, 62% of the population over 15 years of age are married, 57% speak English and 15% speak Spanish. 59% of Des Plaines residents were born in Illinois, 9% were born out of state, 1% were born outside of the United States and 31% were foreign born.