Union Township is one of eight townships in Fulton County, Indiana. As of the 2020 census, its population was 1,259 (down from 1,397 at 2010) and it contained 691 housing units.
According to the 2010 census, the township has a total area of , of which (or 99.00%) is land and (or 0.98%) is water.
(This list is based on USGS data and may include former settlements.)
The township contains four cemeteries: Barnett, Bruce Lake, Independent Order of Odd Fellows and Shaffer.