Benton, IA has a population of 43 and is the 28,329th largest city in the United States. The population density is 64 per sq mi which is 17% higher than the Iowa average and 29% lower than the national average. The median age in Benton is 67 which is approximately 75% higher than the Iowa average of 38. In Benton, 81% of the population over 15 years of age are married, 100% speak English and 0% speak Spanish. 70% of Benton residents were born in Iowa, 30% were born out of state, 0% were born outside of the United States and 0% were foreign born.