Island Lake is a village in Lake and McHenry counties in the U.S. state of Illinois. The population was 8,080 at the 2010 census.
The village was incorporated on June 25, 1952.
Island Lake is a village located at 42°16′40″N 88°12′3″W (42.277691, -88.200747), lying in the far northwest Chicago suburbs.
According to the 2010 census, Island Lake has a total area of 3.597 square miles (9.32 km2), of which 3.39 square miles (8.78 km2) (or 94.25%) is land and 0.207 square miles (0.54 km2) (or 5.75%) is water.