Jefferson Township is one of twelve townships in Jay County, Indiana, United States.

As of the 2020 census, its population was 684 (down from 770 at 2010[2]) and it contained 292 housing units.

[1] Jefferson Township was organized in 1837.

[3] According to the 2010 census, the township has a total area of 35.16 square miles (91.1 km2), of which 35.13 square miles (91.0 km2) (or 99.91%) is land and 0.03 square miles (0.078 km2) (or 0.09%) is water.

The township contains seven cemeteries: Bost, Flesher, New Mount Pleasant, Powers, Stephens, Stratton and Wentz.