Topeka is an incorporated village in Mason County, Illinois, United States.

According to the U.S. Census Bureau, Topeka has a total area of 0.14 square miles (0.36 km2), all land.

[2] Mason Creek, a west-flowing tributary of the Illinois River, passes just south of the village limits.

There were 36 housing units at an average density of 259.2 per square mile (100.1/km2).

16.7% of all households were made up of individuals, and 5.6% had someone living alone who was 65 years of age or older.