Mill Shoals, IL has a population of 194 and is the 24,585th largest city in the United States. The population density is 245 per sq mi which is 10% higher than the Illinois average and 171% higher than the national average. The median age in Mill Shoals is 44 which is approximately 18% higher than the Illinois average of 37. In Mill Shoals, 58% of the population over 15 years of age are married, 98% speak English and 1% speak Spanish. 76% of Mill Shoals residents were born in Illinois, 23% were born out of state, 0% were born outside of the United States and 1% were foreign born.