Miller, IA has a population of 0 and is the 29,103rd largest city in the United States. The population density is 0 per sq mi which is 100% lower than the Iowa average and 100% lower than the national average. The median age in Miller is 0 which is approximately 100% lower than the Iowa average of 38. In Miller, n/a of the population over 15 years of age are married, n/a speak English and n/a speak Spanish. n/a of Miller residents were born in Iowa, n/a were born out of state, n/a were born outside of the United States and n/a were foreign born.