Rock Grove Township is located in Stephenson County, Illinois.

As of the 2010 census, its population was 1,388 and it contained 761 housing units.

Rock Grove is Township 28 (part) and 29 North, Range 8 (part) and 9 East of the Fourth Principal Meridian.

According to the 2010 census, the township has a total area of 30.42 square miles (78.8 km2), of which 30.27 square miles (78.4 km2) (or 99.51%) is land and 0.15 square miles (0.39 km2) (or 0.49%) is water.

This Stephenson County, Illinois location article is a stub.