Riverton, IL has a population of 3,449 and is the 8,118th largest city in the United States. The population density is 1,445 per sq mi which is 550% higher than the Illinois average and 1495% higher than the national average. The median age in Riverton is 41 which is approximately 10% higher than the Illinois average of 37. In Riverton, 50% of the population over 15 years of age are married, 97% speak English and 1% speak Spanish. 84% of Riverton residents were born in Illinois, 13% were born out of state, 0% were born outside of the United States and 2% were foreign born.