Owaneco is a village in Christian County, Illinois, United States.

According to the 2021 census gazetteer files, Owaneco has a total area of 0.46 square miles (1.19 km2), all land.

There were 93 housing units at an average density of 203.06 per square mile (78.40/km2).

The racial makeup of the village was 96.65% White, 0.96% African American, and 2.39% from two or more races.

18.39% of all households were made up of individuals, and 5.75% had someone living alone who was 65 years of age or older.