[2] It is part of the Johnstown, Pennsylvania, Metropolitan Statistical Area.

[3] According to the United States Census Bureau, the township has a total area of 25.2 square miles (65 km2), of which 25.2 square miles (65 km2) is land and 0.04% is water.

The village of Pocahontas is located within Greenville Township.

At the 2000 census there were 718 people, 239 households, and 196 families living in the township.

[5] Of the 239 households 39.7% had children under the age of 18 living with them, 72.0% were married couples living together, 7.5% had a female householder with no husband present, and 17.6% were non-families.