As of the 2020 census, its population was 2,771 (down from 3,088 at 2010[2]) and it contained 1,949 housing units.

It was likely named after Union County, Indiana, the former home of some of the early settlers.

[3] The East Shore Historic District and Norris Farm-Maxinkuckee Orchard are listed on the National Register of Historic Places.

[2] (This list is based on USGS data and may include former settlements.)

The township contains these five cemeteries: Burr Oak, Cromley, Masonic, Washington and Zion.