The old facility was a white block building located in the village of Whitaker on 9000 N. Road.

According to the 2010 census, the township has a total area of 37.25 square miles (96.5 km2), all land.

[2] The land in Sumner Township is predominantly flat, with the exception of a few select areas.

The rich, dark prairie soils make the township valuable as farmland.

The township office is located at 9315 North 8000 East Road, Grant Park, IL 60940.