Algonquin Township is located in McHenry County, Illinois, with the township office in the city of Crystal Lake.[2] 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.
Geography
According to the 2010 census, the township has a total area of 48.03 square miles (124.4 km2), of which 46.42 square miles (120.2 km2) (or 96.65%) is land and 1.61 square miles (4.2 km2) (or 3.35%) is water.[4]