Winterset, IA has a population of 5,158 and is the 6,323rd largest city in the United States. The population density is 1,127 per sq mi which is 1963% higher than the Iowa average and 1144% higher than the national average. The median age in Winterset is 43 which is approximately 13% higher than the Iowa average of 38. In Winterset, 66% of the population over 15 years of age are married, 95% speak English and 2% speak Spanish. 84% of Winterset residents were born in Iowa, 13% were born out of state, 0% were born outside of the United States and 3% were foreign born.