Manchester, IA has a population of 5,083 and is the 6,394th largest city in the United States. The population density is 1,048 per sq mi which is 1818% higher than the Iowa average and 1056% higher than the national average. The median age in Manchester is 40 which is approximately 5% higher than the Iowa average of 38. In Manchester, 64% of the population over 15 years of age are married, 99% speak English and 1% speak Spanish. 86% of Manchester residents were born in Iowa, 14% were born out of state, 0% were born outside of the United States and 0% were foreign born.