As of the 2020 census, its population was 1,072 and it contained 450 housing units.

[1] The township is an almost precise 6 mile by 6 mile square; 36.46 square miles and runs from the intersection of County Road 200N and County Road CR1700W (Jasper County line) southwards along CR1700W to CR400S thence east to CR 1100W thence north to CR200N and finally back west to the origin.

[2] According to the 2010 census, the township has a total area of 36.46 square miles (94.4 km2), all land.

[4] The township contains five cemeteries: White Post, Medaryville (or Rose Hill), Bowman, Saint Henry's and Saint Mark's.

White Post Township residents may obtain a free library card from the Pulaski County Public Library in Winamac.