Perkiomen Township is a township in Montgomery County, Pennsylvania, United States. As of the 2010 census, the township population was 9,139, which represents a 28.8% increase from the 2000 total of 7,093 residents. Governmentally, it is a township of the second class, governed by a board of supervisors. It is part of the Perkiomen Valley School District. Perkiā¦Perkiomen Township is a township in Montgomery County, Pennsylvania, United States. As of the 2010 census, the township population was 9,139, which represents a 28.8% increase from the 2000 total of 7,093 residents. Governmentally, it is a township of the second class, governed by a board of supervisors. It is part of the Perkiomen Valley School District. Perkiomen Township includes an abundance of history that goes as far back as to the first tribes who inhabited the area. This township started with the inhabitants of the Lenni-Lenape Tribe and progressed in many ways into what it is today.