As of the 2020 census, its population was 490 and it contained 228 housing units.

[1] Jefferson Township was organized in 1851, and named after Thomas Jefferson, third President of the United States.

[2] According to the 2010 census, the township has a total area of 36.4 square miles (94 km2), all land.

[4] The township contains these three cemeteries: Burroughs, Idle and Koster.

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