Union Township is one of eleven townships in Montgomery County, Indiana, United States. As of the 2020 census, its population was 25,087 (up from 24,587 at 2010) and it contained 10,949 housing units. Wabash College is located in Crawfordsville in this township.
According to the 2010 census, the township has a total area of , of which (or 99.73%) is land and (or 0.27%) is water.
(This list is based on USGS data and may include former settlements.)
The township contains these nineteen cemeteries: Ben Hur, Breaks, Calvary, Coons, Finley Chapel, Galey, Harshbarger, Hutton, Independent Order of Odd Fellows, Lutheran, Michael, Nutt, Oak Hill, Oldtown, Sidener, Stover, Weir, Wilhite and Wilson.