Peotone, IL has a population of 4,146 and is the 7,284th largest city in the United States. The population density is 2,221 per sq mi which is 899% higher than the Illinois average and 2351% higher than the national average. The median age in Peotone is 39 which is approximately 5% higher than the Illinois average of 37. In Peotone, 55% of the population over 15 years of age are married, 94% speak English and 4% speak Spanish. 84% of Peotone residents were born in Illinois, 13% were born out of state, 0% were born outside of the United States and 3% were foreign born.