Mapleton, IA has a population of 1,299 and is the 13,558th largest city in the United States. The population density is 810 per sq mi which is 1321% higher than the Iowa average and 794% higher than the national average. The median age in Mapleton is 49 which is approximately 30% higher than the Iowa average of 38. In Mapleton, 62% of the population over 15 years of age are married, 95% speak English and 4% speak Spanish. 81% of Mapleton residents were born in Iowa, 15% were born out of state, 0% were born outside of the United States and 3% were foreign born.