 According to the United States Census Bureau, the township has a total area of 34.4 square miles (89.1 km²), of which 34.4 square miles (89.0 km²) is land and 0.04 square miles (0.1 km²) (0.06%) is water.Burgettstown

Atlasburg, Bavington (also in Hanover Township, Washington County), Bonnymeade, Bulger, Cherry Valley, Erie Mine, Francis Mine, Harmon Creek, Hickton, Joffre, Langeloth, Slovan

Smith Township has six borders, including Hanover Township to the north and northwest, Robinson Township to the northeast, Midway to the east, Mount Pleasant Township to the southeast, Cross Creek Township to the southwest, and Jefferson Township to the west.At the 2000 census there were 4,567 people, 1,813 households, and 1,281 families living in the township.