Dement Township is one of twenty-four townships in Ogle County, Illinois, USA. As of the 2010 census, its population was 989 and it contained 409 housing units.
Dement Township was formed from the east half of Flagg Township on September 11, 1855. The township was named for John Dement (1804âÂÂ1883), a politician and militia commander from Illinois.
According to the 2010 census, the township has a total area of , of which (or 99.86%) is land and (or 0.14%) is water. It contains the village of Creston, and the east side of the city of Rochelle.
The township contains Woodlawn Cemetery.