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New Castle, city, seat (1849) of Lawrence county, western Pennsylvania, U.S. It lies at the juncture of the Shenango and Mahoning rivers and Neshannock Creek and in the foothills of the Allegheny Mountains, 20 miles (32 km) southeast of Youngstown, Ohio. Originally the site of a Delaware Indian capital, it was settled in about 1798 by John Stewart, who built an iron furnace and named the place for the English industrial city of Newcastle upon...