Avon, IL has a population of 803 and is the 16,577th largest city in the United States. The population density is 1,769 per sq mi which is 696% higher than the Illinois average and 1853% higher than the national average. The median age in Avon is 39 which is approximately 5% higher than the Illinois average of 37. In Avon, 53% of the population over 15 years of age are married, 99% speak English and 0% speak Spanish. 84% of Avon residents were born in Illinois, 15% were born out of state, 0% were born outside of the United States and 0% were foreign born.