Marion Township is a township in Butler County, Pennsylvania, United States. The population was 1,150 at the 2020 census. Marion Township is located along the northern border of Butler County, with Venango County to the north. The unincorporated community of Boyers is in the southeastern part of the township. Slippery Rock Creek flows throug…Marion Township is a township in Butler County, Pennsylvania, United States. The population was 1,150 at the 2020 census. Marion Township is located along the northern border of Butler County, with Venango County to the north. The unincorporated community of Boyers is in the southeastern part of the township. Slippery Rock Creek flows through the southeast part of the township past Boyers. Murrinsville is near the eastern border of the township.
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