Jefferson Township is one of twelve townships in Adams County, Indiana.

[1] As of the 2020 census, its population was 1,363,[2] up from 1,089 at the previous census.

[3] According to the "2020 American Community Survey 5-Year Estimates", 33.9% of the township's population spoke only English, while 63.9 spoke an "other [than Spanish] Indo-European language"[2] (basically Pennsylvania German/German).

According to the 2010 census, the township has a total area of 24.13 square miles (62.5 km2), of which 24.1 square miles (62 km2) (or 99.88%) is land and 0.03 square miles (0.078 km2) (or 0.12%) is water.

[3] The township contains the following cemeteries: Loofborrow, Rumple (also known as Cook- no longer exists), and St. Mary Catholic.