For the township in Venango County, see Plum Township, Pennsylvania. Plum is a borough in Allegheny County in the U.S. state of Pennsylvania. A suburb of Pittsburgh, Pennsylvania, it is located northeast of the city of Pittsburgh, in what is commonly referred to as the East Hills suburbs. The population was 27,126 at the 2010 census.Plum is often referred to as Plum Boro or more correctly Plum Borough by locals to distinguish it from its previous status as a township. It was founded as Plum Township in 1788 and was reorganized as a borough in 1956. The borough took its name from nearby Plum Creek.
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