Trout Valley, IL has a population of 537 and is the 19,135th largest city in the United States. The population density is 1,246 per sq mi which is 461% higher than the Illinois average and 1276% higher than the national average. The median age in Trout Valley is 49 which is approximately 32% higher than the Illinois average of 37. In Trout Valley, 69% of the population over 15 years of age are married, 94% speak English and 2% speak Spanish. 70% of Trout Valley residents were born in Illinois, 23% were born out of state, 1% were born outside of the United States and 6% were foreign born.