Oreana is a village in Macon County, Illinois, United States, which had a population of 891 at the 2020 census.

[3] Illinois Route 48 passes through the village, leading southwest 9 miles (14 km) to Decatur, the county seat, and northeast 4 miles (6 km) to Argenta.

According to the U.S. Census Bureau, Oreana has a total area of 0.5 square miles (1.29 km2), all land.

There were 353 housing units at an average density of 706 per square mile (273/km2).

20.1% of all households were made up of individuals, and 7.3% had someone living alone who was 65 years of age or older.