As of the 2020 census, its population was 447 (down from 475 at 2010[4]) and it contained 186 housing units.

Rock Creek Township was organized in 1828.

3 at Rockfield was listed on the National Register of Historic Places in 1988.

[4] The township contains four cemeteries: Brown, Independent Order of Odd Fellows, Mullendore and Parks.

Rock Creek Township residents may obtain a library card at the Delphi Public Library in Delphi.