Volo, IL has a population of 3,576 and is the 7,948th largest city in the United States. The population density is 912 per sq mi which is 310% higher than the Illinois average and 907% higher than the national average. The median age in Volo is 34 which is approximately 9% lower than the Illinois average of 37. In Volo, 62% of the population over 15 years of age are married, 79% speak English and 11% speak Spanish. 71% of Volo residents were born in Illinois, 15% were born out of state, 2% were born outside of the United States and 13% were foreign born.