Roanoke, IL has a population of 2,146 and is the 10,599th largest city in the United States. The population density is 2,272 per sq mi which is 922% higher than the Illinois average and 2407% higher than the national average. The median age in Roanoke is 43 which is approximately 15% higher than the Illinois average of 37. In Roanoke, 69% of the population over 15 years of age are married, 99% speak English and 0% speak Spanish. 89% of Roanoke residents were born in Illinois, 10% were born out of state, 0% were born outside of the United States and 0% were foreign born.