McCullom Lake is a village in McHenry County, Illinois, United States. Per the 2020 census, the population was 988. McCullom Lake is located at 42°22′07″N 88°17′49″W / 42.36861°N 88.29694°W. According to the 2010 census, McCullom Lake has a total area of 0.37 square miles, all land. McHenry occupies the southeast shore. The Lake is well known local…McCullom Lake is a village in McHenry County, Illinois, United States. Per the 2020 census, the population was 988. McCullom Lake is located at 42°22′07″N 88°17′49″W / 42.36861°N 88.29694°W. According to the 2010 census, McCullom Lake has a total area of 0.37 square miles, all land. McHenry occupies the southeast shore. The Lake is well known locally for excellent ice fishing. Shallow weeds in the late summer time at the McCullom Lake beach, make its beach dangerous and have limited game fishing.