Ashton, IA has a population of 427 and is the 20,503rd largest city in the United States. The population density is 430 per sq mi which is 688% higher than the Iowa average and 375% higher than the national average. The median age in Ashton is 37 which is approximately 4% lower than the Iowa average of 38. In Ashton, 60% of the population over 15 years of age are married, 99% speak English and 1% speak Spanish. 74% of Ashton residents were born in Iowa, 25% were born out of state, 1% were born outside of the United States and 0% were foreign born.