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The Key Peninsula ("The KP" or "The Key" to some locals) is a finger of land in Puget Sound, Washington, United States . It is approximately 16 miles (26 km) long and extends south from the Kitsap Peninsula. It is part of Pierce County, Washington. Some of its towns include: Wauna, Key Center, Vaughn, Home, Lakebay, and Longbranch. Its name is derived from the key-like shape of the peninsula.
The Key Peninsula is in the Peninsula School District; Elementary school is provided by a number of small schools up and down the peninsula while middle school is provided by Key Peninsula Middle School. High school age children attend Peninsula High School (PHS) on the Gig Harbor Peninsula in Purdy.
More information can be found at the Key Peninsula Historical Society  and in "Early Days of the Key Peninsula" by R.T. Arledge and "The Woodpecker Menace" by Ted Olinger.
- U.S. Geological Survey Geographic Names Information System: Key Peninsula
- Findlay, Jean Cammon and Paterson, Robin, Mosquito Fleet of Southern Puget Sound, (2008) Arcadia Publishing ISBN 0-7385-5607-6, at pages 10-11, 18, 27 and 35.