Wenonah is a small village in Montgomery County, Illinois, United States.

[3] Wenonah is in northeastern Montgomery County and is bordered to the south by the city of Nokomis.

According to the U.S. Census Bureau, Wenonah has a total area of 1.51 square miles (3.91 km2), all land.

There were 17 housing units at an average density of 11.3 per square mile (4.3/km2).

25.0% of all households were made up of individuals, and 12.5% had someone living alone who was 65 years of age or older.