Benson, IL has a population of 458 and is the 20,086th largest city in the United States. The population density is 2,807 per sq mi which is 1163% higher than the Illinois average and 2998% higher than the national average. The median age in Benson is 35 which is approximately 7% lower than the Illinois average of 37. In Benson, 64% of the population over 15 years of age are married, 97% speak English and 1% speak Spanish. 86% of Benson residents were born in Illinois, 13% were born out of state, 0% were born outside of the United States and 0% were foreign born.