Algonquin Township, McHenry County, Illinois

Algonquin Township is located in McHenry County, Illinois, with the township office in the city of Crystal Lake. As of the 2020 census, its population was 87,633 and it contained 33,960 housing units. It is the largest township by population in McHenry County. Communities located within the township include Algonquin, Barrington Hills, Cary, Crystal Lake, Fox River Grove, Lake in the Hills, Port Barrington, Lakewood, Oakwood Hills, and Trout Valley.

Geography
According to the 2010 census, the township has a total area of 48.03 sqmi, of which 46.42 sqmi (or 96.65%) is land and 1.61 sqmi (or 3.35%) is water.