Lancaster Township is located in Stephenson County, Illinois. As of the 2010 census, its population was 1,587 and it contained 692 housing units. It contains part of the census-designated place of Willow Lake.
Geography
Lancaster is Township 27 North, Range 8 East of the Fourth Principal Meridian. According to the 2010 census, the township has a total area of , of which (or 99.78%) is land and (or 0.22%) is water. ==Demographics==