Sun Valley Lake, IA has a population of 224 and is the 23,953rd largest city in the United States. The population density is 93 per sq mi which is 70% higher than the Iowa average and 2% higher than the national average. The median age in Sun Valley Lake is 66 which is approximately 74% higher than the Iowa average of 38. In Sun Valley Lake, 86% of the population over 15 years of age are married, 98% speak English and 0% speak Spanish. 68% of Sun Valley Lake residents were born in Iowa, 32% were born out of state, 0% were born outside of the United States and 0% were foreign born.