Several of the Pelham Islands became part of New Rochelle after Jacob Leisler’s purchase of 6,000 acres (2,400 hectares) from the Pell family in 1688. The remaining islands became part of Bronx County in 1895 with the establishment of the current Westchester-Bronx County line.
City Island - originally known as “Great Minnefords”, the 235 acre island is the largest of the group. Before the Revolutionary War, Benjamin Palmer renamed it "City Island" as part of his plans to create a great port city. The onset of the Revolutionary War brought an end to those plans. It remained part of the Town of Pelham until June 6, 1895, when the present boundary line between Westchester and Bronx Counties was established, placing City Island within Bronx County, City of New York.
Davids Island - a 78-acre island in New Rochelle. The island has been used as farmland by the early Huguenot settlers, a military hospital for injured Civil War soldiers, a U.S. Army Fort (Fort Slocum), and a U.S. Army Air Defense Command "Nike" missile site during the Cold War.
Hart Island - originally known as “Little Minnefords”, the 101 acre island lies off the eastern shore of City Island, The federal government took possession of the island during the Civil War for use as a training facility. The City of New York purchased Hart Island in 1868 and has been used as a quarantine site for infected individuals during the Yellow Fever Epidemic, a reformatory for vicious boys, a home for German prisoners of war during World War II, a "Nike" missile installation used by the U.S. Army Air Defense Command during the Cold War, and a facility for the rehabilitation of drug addicts. It is currently used as a potters field.
High Island - an 8-acre island was purchased in 1762 by Captain John Wooley, which he then named "High Island" for its elevated center. A radio broadcasting company bought the island in 1962 and built an automobile bridge to City Island. WCBS and WFAN currently operate the 529-foot antenna tower on the island.
Hunter Island - the 19th century country estate of the wealthy New York City merchant John Hunter. When the City developed Pelham Bay Park in 1937, the stretch of water between Hunter's Island and the land opposite City Island Bridge was filled, converting the island into a peninsula.
Rat Island - a 2.5 acre island which has been used as a typhoid quarantine hospital, an artists' and writers' colony, and a fisherman’s campsite.