It is part of the Lebanon, Pennsylvania metropolitan statistical area.

[2] Waterville Bridge in the township was added to the National Register of Historic Places in 1980.

Lickdale is in the eastern section of the township next to Swatara Creek.

Portions of the Appalachian Trail, Pennsylvania State Game Lands Number 80, and Swatara State Park are located along the northern part of the township.

In the Union Township, the population was spread out, with 21.9% under the age of 18, 8.3% from 18 to 24, 29.0% from 25 to 44, 27.4% from 45 to 64, and 13.4% 65 or older.