Middletown Township is a township in Delaware County, Pennsylvania, United States. The population was 15,807 at the 2010 census. The Pennsylvania State University has an undergraduate satellite campus called Penn State Brandywine located in the north-central portion of the township. Located outside of Philadelphia, it constitutes part of the D…Middletown Township is a township in Delaware County, Pennsylvania, United States. The population was 15,807 at the 2010 census. The Pennsylvania State University has an undergraduate satellite campus called Penn State Brandywine located in the north-central portion of the township. Located outside of Philadelphia, it constitutes part of the Delaware Valley.
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