Dundee Township occupies the 6-mile square in the Northeast corner of Kane County, Illinois. It includes West and East Dundee, Carpentersville, Sleepy Hollow, Gilberts and portions of Elgin, Barrington Hills, Hoffman Estates, and Algonquin. It is divided by the Fox River.
As of the 2010 census, its population was 64,167 and it contained 21,635 housing units.