Willow Springs, IL has a population of 5,677 and is the 5,964th largest city in the United States. The population density is 1,386 per sq mi which is 523% higher than the Illinois average and 1429% higher than the national average. The median age in Willow Springs is 45 which is approximately 19% higher than the Illinois average of 37. In Willow Springs, 64% of the population over 15 years of age are married, 79% speak English and 3% speak Spanish. 77% of Willow Springs residents were born in Illinois, 9% were born out of state, 1% were born outside of the United States and 13% were foreign born.