Iowa City, IA has a population of 72,385 and is the 502nd largest city in the United States. The population density is 2,796 per sq mi which is 5018% higher than the Iowa average and 2986% higher than the national average. The median age in Iowa City is 26 which is approximately 31% lower than the Iowa average of 38. In Iowa City, 37% of the population over 15 years of age are married, 83% speak English and 5% speak Spanish. 49% of Iowa City residents were born in Iowa, 36% were born out of state, 1% were born outside of the United States and 14% were foreign born.