Census-designated places in the township include Fredericksburg (also known as "Clover Creek"), Millerstown, Henrietta, Curryville, Martinsburg Junction, Spring Drive Mobile Home Park, and Homewood at Martinsburg.

According to the United States Census Bureau, the township has a total area of 20.8 square miles (53.9 km2), all land.

A portion of Pennsylvania State Game Lands Number 73 is located on the eastern border of the township.

The racial makeup of the township was 99.38% White, 0.18% African American, 0.04% Asian, and 0.40% from two or more races.

24.2% of all households were made up of individuals, and 14.2% had someone living alone who was 65 years of age or older.