Coal Valley, IL has a population of 3,825 and is the 7,647th largest city in the United States. The population density is 1,383 per sq mi which is 507% higher than the Illinois average and 1427% higher than the national average. The median age in Coal Valley is 45 which is approximately 21% higher than the Illinois average of 37. In Coal Valley, 65% of the population over 15 years of age are married, 99% speak English and 1% speak Spanish. 69% of Coal Valley residents were born in Illinois, 30% were born out of state, 0% were born outside of the United States and 1% were foreign born.