Pinckneyville, IL has a population of 5,422 and is the 6,119th largest city in the United States. The population density is 1,320 per sq mi which is 494% higher than the Illinois average and 1357% higher than the national average. The median age in Pinckneyville is 36 which is approximately 3% lower than the Illinois average of 37. In Pinckneyville, 41% of the population over 15 years of age are married, 96% speak English and 3% speak Spanish. 88% of Pinckneyville residents were born in Illinois, 9% were born out of state, 0% were born outside of the United States and 2% were foreign born.