Rockwood Township derives its name from Charles H. Rockwell, an early settler.

As of the census[1] of 2000, there were 469 people, 158 households, and 139 families residing in the township.

The population density was 14.1 people per square mile (5.5/km2).

There were 158 households, out of which 41.1% had children under the age of 18 living with them, 82.3% were married couples living together, 4.4% had a female householder with no husband present, and 11.4% were non-families.

9.5% of all households were made up of individuals, and 3.8% had someone living alone who was 65 years of age or older.