Du Quoin, IL has a population of 5,932 and is the 5,795th largest city in the United States. The population density is 850 per sq mi which is 282% higher than the Illinois average and 838% higher than the national average. The median age in Du Quoin is 41 which is approximately 10% higher than the Illinois average of 37. In Du Quoin, 51% of the population over 15 years of age are married, 98% speak English and 1% speak Spanish. 84% of Du Quoin residents were born in Illinois, 15% were born out of state, 1% were born outside of the United States and 1% were foreign born.