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Leetsdale was incorporated on March 28, 1904. Leetsdale at one time had a formidable industrial manufacturing base, with a Bethlehem Steel mill that closed in the late 1970s. The site of the mill on the shore of the Ohio River is now the Leetsdale Industrial Park, or the Port of Leetsdale, and is home to facilities leased, by The Buncher Company, to a number of companies of varying sizes.