Portland Township, Whiteside County, Illinois

Portland Township is located in Whiteside County, Illinois. As of the 2010 census, its population was 422 and it contained 186 housing units.

Geography
According to the 2010 census, the township has a total area of 35.65 sqmi, of which 34.73 sqmi (or 97.42%) is land and 0.92 sqmi (or 2.58%) is water.