Middlesex Township is a township in Butler County, Pennsylvania, United States. The population was 5,390 at the 2010 census.GeographyMiddlesex Township is located in south-central Butler County, with Allegheny County to the south. The unincorporated communities of Cooperstown and Glade Mills are near the center of the township along Pennsylvania Route 8, which crosses the township from north to south.According to the United States Census Bureau, the township has a total area of 60.1sqkm, of which 59.9sqkm is land and 0.2sqkm, or 0.31%, is water.StreamsDeer Creek and Bull Creek originate in the southeast section of the township; they flow south to the Allegheny River in Allegheny County.DemographicsAs of the census of 2000, there were 5,586 people, 2,045 households, and 1,615 families residing in the township. The population density was 243.2 people per square mile (93.9/km²). There were 2,105 housing units at an average density of 91.7/sq mi (35.4/km²). The racial makeup of the township was 98.89% White, 0.25% African American, 0.09% Native American, 0.16% Asian, 0.02% Pacific Islander, 0.20% from other races, and 0.39% from two or more races. Hispanic or Latino of any race were 0.68% of the population.
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