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Pittsburgh is the seat of allegheny county and with a population of 307,484 is the second-largest city in the u.s. commonwealth of pennsylvania. with a metropolitan csa population of 2,661,369 it is the largest in both the ohio valley and appalachia and the 22nd-largest in the u.s. pittsburgh is known as both "the steel city" for its more than 300 related businesses and "the city of bridges" for its world record 446 bridges.