McKeesport (məkēzˈpôrt) [key], city (1990 pop. 26,016), Allegheny co., SW Pa., in hilly terrain at the confluence of the Monongahela and Youghiogheny rivers; settled 1755, inc. as a city 1890. An industrial city in the Pittsburgh vicinity, McKeesport declined following the collapse of the U.S. steel industry in the 1980s. Manufacturing now includes electrical equipment, solvents, metal fabrication, coal tar products, and meat processing. Pennsylvania State Univ. has a campus there.