McCullom Lake is a village in McHenry County, Illinois, United States.

[2] According to the 2010 census, McCullom Lake has a total area of 0.37 square miles (0.96 km2), all land.

There were 418 housing units at an average density of 1,493.3 per square mile (576.6/km2).

22.8% of all households were made up of individuals, and 5.2% had someone living alone who was 65 years of age or older.

In April 2006, three former next-door neighbors who contracted brain cancer filed a class action lawsuit against several manufacturers in the neighboring town of Ringwood, claiming that groundwater and air contamination caused their illnesses.