Duquesne (dəkānˈ, dō–, dyō–) [key], city (1990 pop. 8,525), Allegheny co., SW Pa., on the Monongahela River, opposite McKeesport, in a coal region; settled 1789, laid out 1885 by the Duquesne Steel Company, inc. as a city 1917. There is light manufacturing.
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