- a port in SW Pennsylvania, at the confluence of the Allegheny and Monongahela rivers that forms the Ohio River: steel industry.
- a port in SW Pennsylvania, at the confluence of the Allegheny and Monongahela Rivers, which form the Ohio River: settled around Fort Pitt in 1758; developed rapidly with the discovery of iron deposits and one of the world's richest coalfields; the largest river port in the US and an important industrial centre, formerly with large steel mills. Pop: 325 337 (2003 est)
