Buckley, IL has a population of 553 and is the 18,948th largest city in the United States. The population density is 1,639 per sq mi which is 637% higher than the Illinois average and 1709% higher than the national average. The median age in Buckley is 51 which is approximately 35% higher than the Illinois average of 37. In Buckley, 67% of the population over 15 years of age are married, 99% speak English and 1% speak Spanish. 85% of Buckley residents were born in Illinois, 15% were born out of state, 0% were born outside of the United States and 0% were foreign born.