Oreana, IL has a population of 848 and is the 16,199th largest city in the United States. The population density is 1,705 per sq mi which is 667% higher than the Illinois average and 1781% higher than the national average. The median age in Oreana is 43 which is approximately 15% higher than the Illinois average of 37. In Oreana, 66% of the population over 15 years of age are married, 98% speak English and 1% speak Spanish. 87% of Oreana residents were born in Illinois, 10% were born out of state, 0% were born outside of the United States and 3% were foreign born.