Channel Lake is an unincorporated community and census-designated place in Antioch Township, Lake County, Illinois, United States. Per the 2020 census, the population was 1,581. Channel Lake is located in northwestern Lake County at 42°28′40″N 88°8′55″W / 42.47778°N 88.14861°W, on the northwest and southwest sides of Channel Lake…Channel Lake is an unincorporated community and census-designated place in Antioch Township, Lake County, Illinois, United States. Per the 2020 census, the population was 1,581. Channel Lake is located in northwestern Lake County at 42°28′40″N 88°8′55″W / 42.47778°N 88.14861°W, on the northwest and southwest sides of Channel Lake, part of the Chain O'Lakes system of lakes in northern Illinois leading to the Fox River. It is bordered to the east by the community of Lake Catherine and to the north by the village of Salem Lakes, Wisconsin.