Manson, IA has a population of 1,825 and is the 11,559th largest city in the United States. The population density is 575 per sq mi which is 952% higher than the Iowa average and 534% higher than the national average. The median age in Manson is 40 which is approximately 6% higher than the Iowa average of 38. In Manson, 68% of the population over 15 years of age are married, 99% speak English and 0% speak Spanish. 80% of Manson residents were born in Iowa, 19% were born out of state, 0% were born outside of the United States and 1% were foreign born.