Coralville, IA has a population of 20,078 and is the 2,171st largest city in the United States. The population density is 1,595 per sq mi which is 2819% higher than the Iowa average and 1660% higher than the national average. The median age in Coralville is 32 which is approximately 15% lower than the Iowa average of 38. In Coralville, 53% of the population over 15 years of age are married, 85% speak English and 3% speak Spanish. 52% of Coralville residents were born in Iowa, 33% were born out of state, 1% were born outside of the United States and 14% were foreign born.