Arenzville is a village in Cass County, Illinois, United States.

According to the 2021 census gazetteer files, Arenzville has a total area of 0.77 square miles (1.99 km2), all land.

[4] As of the 2020 census[6] there were 367 people, 151 households, and 107 families residing in the village.

There were 174 housing units at an average density of 226.56 per square mile (87.48/km2).

23.84% of all households were made up of individuals, and 7.28% had someone living alone who was 65 years of age or older.