Wilton, IA has a population of 2,808 and is the 9,138th largest city in the United States. The population density is 1,367 per sq mi which is 2402% higher than the Iowa average and 1408% higher than the national average. The median age in Wilton is 35 which is approximately 8% lower than the Iowa average of 38. In Wilton, 58% of the population over 15 years of age are married, 99% speak English and 1% speak Spanish. 85% of Wilton residents were born in Iowa, 15% were born out of state, 0% were born outside of the United States and 0% were foreign born.