Altoona, IA has a population of 16,692 and is the 2,562nd largest city in the United States. The population density is 1,711 per sq mi which is 3032% higher than the Iowa average and 1789% higher than the national average. The median age in Altoona is 34 which is approximately 10% lower than the Iowa average of 38. In Altoona, 65% of the population over 15 years of age are married, 96% speak English and 2% speak Spanish. 78% of Altoona residents were born in Iowa, 19% were born out of state, 1% were born outside of the United States and 2% were foreign born.