Stronghurst, IL has a population of 944 and is the 15,485th largest city in the United States. The population density is 1,064 per sq mi which is 379% higher than the Illinois average and 1074% higher than the national average. The median age in Stronghurst is 41 which is approximately 10% higher than the Illinois average of 37. In Stronghurst, 59% of the population over 15 years of age are married, 99% speak English and 0% speak Spanish. 58% of Stronghurst residents were born in Illinois, 41% were born out of state, 0% were born outside of the United States and 1% were foreign born.