Union Grove Township is located in Whiteside County, Illinois. As of the 2010 census, its population was 1,244 and it contained 519 housing units.
According to the 2010 census, the township has a total area of 35.09 square miles (90.9 km2), all land.
- ^ a b "Population, Housing Units, Area, and Density: 2010 - County -- County Subdivision and Place -- 2010 Census Summary File 1". United States Census. Retrieved 2013-05-28.
Coordinates: 41°48′53″N 90°02′01″W / 41.81472°N 90.03361°W