As of the 2020 census, its population was 1,297 (down from 1,452 at 2010[4]) and contained 580 housing units.

[5] It was named for Thomas Jefferson, third President of the United States.

[6] Jefferson Township covers an area of 36.1 square miles (93 km2); 0.35 square miles (0.91 km2) (0.97 percent) of this is water.

The township contains two cemeteries: Davis and Zion.

Davis Cemetery is located a mile east of Burnettsville and a half mile east of the White County-Cass county line, and is commonly referred to as the Davis Cemetery Burnettsville in obituaries.