Indianola, IA has a population of 15,343 and is the 2,780th largest city in the United States. The population density is 1,356 per sq mi which is 2382% higher than the Iowa average and 1396% higher than the national average. The median age in Indianola is 33 which is approximately 12% lower than the Iowa average of 38. In Indianola, 52% of the population over 15 years of age are married, 97% speak English and 1% speak Spanish. 80% of Indianola residents were born in Iowa, 19% were born out of state, 0% were born outside of the United States and 1% were foreign born.