Richton Park, IL has a population of 13,668 and is the 3,053rd largest city in the United States. The population density is 3,439 per sq mi which is 1447% higher than the Illinois average and 3695% higher than the national average. The median age in Richton Park is 39 which is approximately 5% higher than the Illinois average of 37. In Richton Park, 40% of the population over 15 years of age are married, 94% speak English and 2% speak Spanish. 75% of Richton Park residents were born in Illinois, 19% were born out of state, 1% were born outside of the United States and 5% were foreign born.