Mackworth Island State Park is an approximately 100-acre (40 ha) island in Falmouth, Maine, USA, adjacent to its border with Portland, Maine. In 1631, Sir Ferdinando Gorges gave the island to Arthur Mackworth, his deputy in Casco Bay, and the island has retained his name. There is a causeway connecting the island to the mainland in Falmouth. Visitors to the island must pass a State park entrance tollhouse and pay an entrance fee; cars can enter the island but parking is limited. There is a footpath around the perimeter of the island with views of Falmouth, Portland, and other islands surrounding the bay. The island is heavily wooded. One portion of the woods is dedicated to “Fairy Houses” which are constructed by visitors using natural materials found on the island.  Mackworth Island has a beautiful rocky shore and offers ample opportunities for surf fisherman of Bluefish and Stripers. There is a nominal 3 dollar entrance fee per person. Although most areas of the island are State Park lands, there is a school area that is not open to the public. The island is also home to the Governor Baxter Dog Memorial, a pet cemetery where fourteen of the former governor's Irish Setters and one of his horses were laid to rest, accompanied by two bronze markers and a gravestone, all enclosed by a circular stone wall.
Governor Baxter School for The Deaf
In 1943, Maine's governor Percival P. Baxter deeded the island and causeway, including his summer home, to the State of Maine. In 1957, the state created the Governor Baxter School for The Deaf (formerly known as the Maine School for The Deaf) on the island. The school is infamous for a sexual abuse scandal which became public in 1981 and involved the school's principal and superintendent. There is currently still a school operating at this site.
Friends School of Portland
Friends School of Portland, an independent Quaker preschool through eighth grade school, was founded in 2006 and was located on Mackworth Island until 2015, when it moved to new facility in nearby Cumberland, Maine. 
- Maine League of Historical Societies and Museums (1970). Doris A. Isaacson (ed.). Maine: A Guide ‘Down East’. Rockland, Me: Courier-Gazette, Inc. p. 425.
- Features | Why I hate Mackworth Island Archived 2006-05-05 at the Wayback Machine
- Voornas, Lori (28 October 2019). "Pet Cemetery on Mackworth Island Is Creepy and Sweet". WJBQ.com. Retrieved 27 July 2020.
But Governor Percival Proctor Baxter (1921-1925) was not only a lover of dogs, but a breeder of Irish Setters. He had all of his dogs (14) and even his horse buried on Mackworth Island.
- Gannon, Jack. 1981. Deaf Heritage–A Narrative History of Deaf America, Silver Spring, MD: National Association of the Deaf, p. 45 (PDF Archived 2012-03-28 at the Wayback Machine)
- "FSP To Stay On Mackworth Until July 2015". Friends School of Portland. Retrieved 22 November 2018.
- Soares, Liz. All for Maine: The Story of Governor Percival P. Baxter. Windswept House Publishers (1996). ISBN 1-883650-17-8
- Mackworth Island Maine Office of Tourism