Tarentum is a borough in Allegheny County in the U.S. state of Pennsylvania. It is 22 miles (35 km) northeast of Downtown Pittsburgh, along the Allegheny River. Tarentum was an industrial center where plate glass and bottles were manufactured; bricks, lumber, steel and iron novelties, steel billets and sheets, sack and wrapping paper were also produced. The Pennsylvania Railroad operated a station in Tarentum; its rail line ran through the town. The population was 4,530 at the 2010 census. Two statues of Hebe, the Greek goddess of youth, are displayed by the borough in Tarentum.
Tarentum is located at 40°36′11″N 79°45′20″W (40.603042, -79.755447).
According to the United States Census Bureau, the borough has a total area of 1.4 square miles (3.6 km2), of which 1.2 square miles (3.1 km2) is land and 0.2 square miles (0.52 km2), or 12.06%, is water.
Tarentum is bordered by East Deer Township to the west, Frazer Township to the northwest, Fawn Township to the north, Harrison Township to the northeast, and Brackenridge to the east. To the southeast, across the Allegheny River in Westmoreland County, are New Kensington (via Tarentum Bridge) and Lower Burrell.
As of the census of 2000, there were 4,993 people, 2,170 households, and 1,306 families residing in the borough.