| Official Name: | Cass Township |
| Settlement Type: | Township |
| Subdivision Type: | Country |
| Subdivision Type1: | State |
| Subdivision Type2: | County |
| Subdivision Name2: | Sullivan |
| Government Type: | Indiana township |
| Unit Pref: | Imperial |
| Area Total Sq Mi: | 39.46 |
| Area Land Sq Mi: | 37.8 |
| Area Water Sq Mi: | 1.67 |
| Area Water Percent: | 4.23 |
| Population As Of: | 2020 |
| Population Total: | 1856 |
| Population Density Sq Mi: | auto |
| Elevation M: | 162 |
| Elevation Ft: | 531 |
| Coordinates: | 39.0853°N -87.2944°W |
| Postal Code Type: | ZIP codes |
| Postal Code: | 47438, 47848, 47882 |
| Blank Name: | GNIS feature ID |
| Blank Info: | 453168 |
Cass Township is one of nine townships in Sullivan County, Indiana, USA. As of the 2020 census, its population was 1,856 and it contained 923 housing units.[1]
According to the 2010 census, the township has a total area of, of which (or 95.79%) is land and (or 4.23%) is water.[2]
(This list is based on USGS data and may include former settlements.)
(These towns are listed as "historical" by the USGS.)
The township contains these five cemeteries: Burris, Clayton Cemeteries (historical), Deckard, Dugger and Houck.