There were 5,302 housing units at an average density of 107.2 per square mile (41.4/km 2). The population density was 296.2 inhabitants per square mile (114.4/km 2). Demographics Īs of the census of 2010, there were 14,663 people, 5,081 households, and 3,805 families residing in the township. Carlisle Airport is in the township on the south side of I-81, between Exits 47 and 48.Īccording to the United States Census Bureau, the township has a total area of 49.0 square miles (127.0 km 2), of which 48.7 square miles (126.2 km 2) are land and 0.3 square miles (0.8 km 2), or 0.63%, is water. Interstate 81 passes through the northern reaches of the township as it bypasses Carlisle, with access from Exits 44 through 49. The unincorporated community of Boiling Springs is near the eastern edge of the township, on the north side of Yellow Breeches Creek.

The borough of Mount Holly Springs is surrounded by the southwest part of the township but is a separate municipality. The township is bordered to the north by the borough of Carlisle, the county seat.

The northern half of the township lies within the Cumberland Valley region, while the southern half is occupied by large hills associated with the South Mountain range. The township is in the southern half of central Cumberland County and is bordered to the south by York and Adams counties. The James Given Tavern was added to the National Register of Historic Places in 1992. The population was 14,663 at the 2010 census, up from 12,939 at the 2000 census. South Middleton Township is a township in Cumberland County, Pennsylvania, United States.

Middlesex township pennsylvania