Mount Pleasant, IA has a population of 8,491 and is the 4,463rd largest city in the United States. The population density is 988 per sq mi which is 1708% higher than the Iowa average and 990% higher than the national average. The median age in Mount Pleasant is 35 which is approximately 9% lower than the Iowa average of 38. In Mount Pleasant, 49% of the population over 15 years of age are married, 91% speak English and 4% speak Spanish. 69% of Mount Pleasant residents were born in Iowa, 24% were born out of state, 1% were born outside of the United States and 6% were foreign born.