Crooked Creek Township covers an area of 84.74 square miles (219.5 km2).

The population density was 14.56 inhabitants per square mile (5.62/km2).

Approximately 0.49% of the population were Hispanic or Latino of any race.

The township contains the unincorporated areas and historical communities of Bessville, Grisham, Lodge, Shrum, and Tallent.

The township contains the following nine cemeteries: Berry, Dalton, Hawn, Lincoln, McMahan, Moores, Old Concord, Slinkard, and Wallis.