South Middleton Township has approximately 51.6 square miles, consists of 103.61 Township road miles and has a population of approximately 12,939. It was established in 1810 when it was divided from the area known as Middleton. When the area was divided, North and South Middleton Townships were created.South Middleton is bordered on the north by Carlisle Borough, North Middleton and Middlesex Townships; on the east by Monroe Township; on the south by York and Adams Counties, with Dickinson Township on the Western border. The Township surrounds the Borough of Mount Holly Springs, although the Borough is not part of the Township.South Middleton is a second class township and operates according to the Commonwealth of Pennsylvania's Second Class Township Code. The governing body consists of five elected supervisors and an appointed Township Manager.