Most of the township is in the Cumberland Valley area of Pennsylvania, but the southern end of the township contains the northeastern end of South Mountain.

Yellow Breeches Creek, a tributary of the Susquehanna River, crosses the township just north of South Mountain.

Unincorporated communities in the township include Churchtown, Brandtsville, and Williams Grove.

The racial makeup of the township was 98.59% White, 0.22% African American, 0.04% Native American, 0.56% Asian, 0.02% Pacific Islander, 0.02% from other races, and 0.56% from two or more races.

16.4% of households were made up of individuals, and 5.6% were one person aged 65 or older.