Owaneco, IL has a population of 201 and is the 24,419th largest city in the United States. The population density is 439 per sq mi which is 97% higher than the Illinois average and 384% higher than the national average. The median age in Owaneco is 45 which is approximately 19% higher than the Illinois average of 37. In Owaneco, 68% of the population over 15 years of age are married, 99% speak English and 0% speak Spanish. 87% of Owaneco residents were born in Illinois, 13% were born out of state, 0% were born outside of the United States and 0% were foreign born.