|o Type||Indiana township|
|o Total||36.1 sq mi (93 km2)|
|o Land||35.97 sq mi (93.2 km2)|
|o Water||0.14 sq mi (0.4 km2)|
|Elevation||653 ft (199 m)|
|o Density||409.2/sq mi (158.0/km2)|
|GNIS feature ID||453247|
Coolspring Township was established in 1836.
According to the 2010 census, the township has a total area of 36.1 square miles (93 km2), of which 35.97 square miles (93.2 km2) (or 99.64%) is land and 0.14 square miles (0.36 km2) (or 0.39%) is water.
The headwaters of the Little Calumet River is located within Coolspring Township, at Red Mill County Park.
The unincorporated town of Waterford is located within the township.