[1] It was formed from Sonora and Pilot Grove townships on April 27, 1855.

According to the 2021 census gazetteer files, Rock Creek Township has a total area of 35.97 square miles (93.16 km2), all land.

[2] (This list is based on USGS data and may include former settlements.)

A large stone designating Rock Creek Cemetery has the names of descendants on its back.

44.30% of all households were made up of individuals, and 21.50% had someone living alone who was 65 years of age or older.