La Grange Park, IL has a population of 13,596 and is the 3,069th largest city in the United States. The population density is 6,092 per sq mi which is 2641% higher than the Illinois average and 6624% higher than the national average. The median age in La Grange Park is 42 which is approximately 11% higher than the Illinois average of 37. In La Grange Park, 66% of the population over 15 years of age are married, 83% speak English and 7% speak Spanish. 76% of La Grange Park residents were born in Illinois, 13% were born out of state, 1% were born outside of the United States and 10% were foreign born.