Summerdale is an unincorporated community located in East Pennsboro Township, Cumberland County, Pennsylvania, United States. As of the 2000 census, the community had a total population of 479. Central Pennsylvania College and the Capital Area Intermediate Unit are located in Summerdale. It is part of the HarrisburgCarlisleMetropolitan Statistical Area. Summerdale is located at 4017'25" North, 7656'4" West (40.293538, -76.926346). According to the United States Census Bureau, Summerdale has a total area of 0.1square miles (0.3km). 0.1square miles (0.3km) of it is land and none of the area is covered with water. It is located on the west side of U.S. Route 11/15 and south side of Interstate 81. These two highways interchange just north of Summerdale. Summerdale is a normal town, but the people of Summerdale find ways to have fun. The main attractions in Summerdale include: Central Pennsylvania College, Capitol Area Intermidiate Unit, and Summerdale United Methodist Church. Summerdale was founded in 1909. As people from Harrisburg came over the river during the summers, a dance hall was erected to support their need to party, thus, starting the town of Summerdale. In 2009, Summerdale held a Centennial Celebration. There was a parade, games, and a year long celebration dedicated to the small town of Summerdale.