As of the 2020 census, its population was 15,684 (up from 14,718 at 2010[4]) and it contained 7,302 housing units.

[5] 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.

[4] 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.

This LaPorte County, Indiana location article is a stub.