Machesney Park, IL has a population of 23,002 and is the 1,893rd largest city in the United States. The population density is 1,813 per sq mi which is 716% higher than the Illinois average and 1901% higher than the national average. The median age in Machesney Park is 40 which is approximately 7% higher than the Illinois average of 37. In Machesney Park, 58% of the population over 15 years of age are married, 93% speak English and 3% speak Spanish. 75% of Machesney Park residents were born in Illinois, 20% were born out of state, 1% were born outside of the United States and 4% were foreign born.