Cascade, IA has a population of 1,978 and is the 11,086th largest city in the United States. The population density is 1,028 per sq mi which is 1782% higher than the Iowa average and 1035% higher than the national average. The median age in Cascade is 45 which is approximately 18% higher than the Iowa average of 38. In Cascade, 75% of the population over 15 years of age are married, 95% speak English and 5% speak Spanish. 85% of Cascade residents were born in Iowa, 12% were born out of state, 0% were born outside of the United States and 3% were foreign born.