Willisville, IL has a population of 548 and is the 19,011th largest city in the United States. The population density is 1,404 per sq mi which is 531% higher than the Illinois average and 1449% higher than the national average. The median age in Willisville is 35 which is approximately 7% lower than the Illinois average of 37. In Willisville, 51% of the population over 15 years of age are married, 98% speak English and 0% speak Spanish. 77% of Willisville residents were born in Illinois, 22% were born out of state, 1% were born outside of the United States and 1% were foreign born.