Xenia, IL has a population of 475 and is the 19,846th largest city in the United States. The population density is 899 per sq mi which is 304% higher than the Illinois average and 892% higher than the national average. The median age in Xenia is 35 which is approximately 6% lower than the Illinois average of 37. In Xenia, 55% of the population over 15 years of age are married, 88% speak English and 8% speak Spanish. 78% of Xenia residents were born in Illinois, 16% were born out of state, 0% were born outside of the United States and 6% were foreign born.