As of the 2020 census, its population was 1,965 (down from 2,142 at 2010[4]) and it contained 902 housing units.

[5] Confusingly, another Union Township was proposed in Randolph County in 1838.

This Union Township was either short lived or was never formed.

It would have consisted of the northern half of the existing West River Township [6] According to the 2010 census, the township has a total area of 71.65 square miles (185.6 km2), of which 71.52 square miles (185.2 km2) (or 99.82%) is land and 0.13 square miles (0.34 km2) (or 0.18%) is water.

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