South Brother Island is one of a pair of small islands in the East River situated between the Bronx and Riker's Island. The other island, larger and better known, is North Brother Island. As late as the 1960s, it was considered part of Queens County, but is now part of Bronx County. It has long been privately owned.

North Brother Island is an island in the East River situated between the Bronx and Riker's Island. Its companion, South Brother Island, is a short distance away. The island was uninhabited until 1885, when Riverside Hospital moved there from the island now known as Roosevelt Island.

North Dumpling Island is a two acre (8,000 mē) island in Fisher's Island Sound off the coast of the U.S. state of Connecticut (although the island itself is actually in New York State). The island is owned by Segway Human Transporter inventor Dean Kamen.

Governors Island is a 217.65 acre (880,806 mē) island in Upper New York Bay, approximately one half mile from the southern tip of Manhattan, of which it is legally a part, in New York City.

It is separated from Brooklyn by the Buttermilk Channel.

Davids' Island is a small island at the western end of Long Island Sound. It is part of New Rochelle, New York. Currently uninhabited, in the past it was the site of Fort Slocum.

The name is often given as David Hawk's or David Hawk, but neither is correct. The island is named after its next-to-last civilian owner before the Army acquired it; New York City ink manufacturer and Westchester County resident Thaddeus Davids. It was first leased (1861-1867), then owned (1867-1965), by the U.S. Government, and was known as Davids' Island Military Reservation until it was named Fort Slocum on July 1st, 1896. Previously it had been named after other owners, and was called successively: Bouteillier's, Rodman's, Myer's, Treadwell's, Hewlett's, Allen's, and Morse's Island. Among recent owners, Donald Trump wished to rename it for himself, but this never happened.

Rikers Island is the name of New York City's largest jail facility, as well as the name of the 413.17-acre (1.672 kmē) island on which it sits, in the East River between the boroughs of Queens and the Bronx, adjacent to the runways of LaGuardia Airport.

The jail complex, operated by the New York City Department of Correction, has a budget of $860 million a year, a staff of 10,000 officers and 1,500 civilians to control a yearly inmate population of up to 130,000.

The official permanent population of the island, as reported by the United States Census Bureau, was 12,780 as of the 2000 census.