The township includes the unincorporated communities of Bald Ridge, Decker's Point (previously called Colfax), Doty's Round Top, East Run, Kinter Hill, Nashville, and Rochester Mills (previously called Richmond).

[3] During the 1920s, the countryside of Grant Township was one of the few in Pennsylvania to have a woman, Grace Barr, appointed as a Rural Free Delivery carrier, delivering mail from the Rochester Mills Post Office.

[4] According to the United States Census Bureau, the township has a total area of 27.0 square miles (70 km2), all land.

The racial makeup of the township was 99.57% White, 0.14% Native American, 0.14% Asian, and 0.14% from two or more races.

25.8% of all households were made up of individuals, and 15.1% had someone living alone who was 65 years of age or older.