List of island counties of the United States

Main articles: County (United States) and List of United States counties and county equivalents

This is a list of counties and county-equivalents of the United States situated entirely or predominantly on islands. The United States of America is composed of 50 states, a federal district, 5 inhabited U.S. territories, and 9 minor outlying islands, which are in turn divided into counties or county-equivalents (parishes, boroughs, independent cities, census divisions, municipalities, or districts). However, within the 50 states, only a small fraction of those are situated entirely on islands.

The 100 county-equivalents in the U.S. territories (such as Puerto Rico) are all entirely on islands — they are listed separately. Including the 100-county equivalents in the U.S. territories, there are 123 counties in the U.S. that are all or partly on islands (out of a total of 3,242 counties).

50 states and District of Columbia

State	Body of water	County	Seat	Population (2015)	Island(s)
Alaska	Pacific Ocean	Aleutians West	None	5,702	Aleutian Islands, Pribilof Islands
	Gulf of Alaska	Kodiak Island	Kodiak	13,889	Afognak Island, Chirikof Island, Kodiak Island and surrounding islands, Semidi Islands Small part situated on the mainland.
		Sitka	Sitka	8,863	Baranof Island, Chichagof Island Consolidated city-county
		Prince of Wales–Hyder	None	6,341	Annette Island, Prince of Wales Island and surrounding islands The community of Hyder is an exclave situated on the mainland.
Florida	Gulf of Mexico	Monroe	Key West	77,482	Florida Keys While most of the county is situated on the mainland, almost all of the population lives on islands.
Hawaii	Pacific Ocean	Hawaii	Hilo	196,428	Island of Hawaii Hawaii is the only state situated entirely on islands.
		Honolulu	Honolulu	998,714	Oahu, Northwestern Hawaiian Islands Consolidated city-county
		Kalawao	None	89	Molokai
		Kauai	Lihue	71,735	Kauai, Niihau, Kaʻula, Lehua
		Maui	Wailuku	164,637	Maui, Molokai, Lanai, Kahoolawe, Molokini
Massachusetts	Atlantic Ocean	Dukes	Edgartown	17,356	Martha's Vineyard, Elizabeth Islands, Nomans Land
		Nantucket	Nantucket	10,172	Nantucket Island, Muskeget Island, Tuckernuck Island Consolidated city-county
Michigan	Lake Superior	Keweenaw	Eagle River	2,168	Keweenaw Peninsula, Isle Royale, Manitou Island The Keweenaw Waterway, which is partly natural, partly manmade and was created in the 1960s, divides the Keweenaw Peninsula in half and forms an island from the northern part. Keweenaw County is situated entirely on this "island".
New York	Atlantic Ocean, Long Island Sound	Kings	None	2,636,735	Long Island and neighboring small islands Conterminous with Brooklyn, a borough of New York City
		Nassau	Mineola	1,361,350	Long Island, Barnum Island, Jones Beach Island, Long Beach Barrier Island, other neighboring small islands
	Hudson River, East River	New York	None	1,644,518	Manhattan Island, part of Ellis Island, Governors Island, Liberty Island, Randalls and Wards Islands, Roosevelt Island A small part (Marble Hill) is situated on the mainland. Conterminous with Manhattan, a borough of New York City.
	Atlantic Ocean, Long Island Sound	Queens	None	2,339,150	Long Island and neighboring small islands Conterminous with Queens, a borough of New York City
	Lower New York Bay, Arthur Kill	Richmond	None	474,558	Staten Island, Prall's Island, other small surrounding islands Conterminous with Staten Island, a borough of New York City
	Atlantic Ocean, Long Island Sound	Suffolk	Riverhead	1,501,587	Long Island, Fire Island, Gardiners Island, Robins Island, Shelter Island, and other neighboring small islands
Rhode Island	Narragansett Bay	Newport	Newport	82,243	Aquidneck Island, Conanicut Island, Prudence Island, surrounding small islands Part of the county is situated on the mainland. The majority of the population resides on Aquidneck Island.
Vermont	Lake Champlain	Grand Isle	North Hero	6,861	Grand Isle, Isle La Motte, North Hero Island, numerous smaller islands A part of the county is situated on the mainland.
Washington	Puget Sound	Island	Coupeville	80,593	Camano Island, Whidbey Island, seven smaller islands
		San Juan	Friday Harbor	16,252	San Juan Islands

U.S. territories

The U.S. territories contain the following 100 county-equivalents, all of which are on islands:

American Samoa

American Samoa has 14 "counties", but these entities are not counted by the U.S. Census Bureau. Instead, American Samoa is divided into 5 county-equivalents — all of them in the Samoan Islands (except for Swains Island, which is part of the Tokelau island chain).

• Eastern District (Tutuila island)
• Manu'a District (Ofu, Olosega and Ta‘ū islands)
• Rose Atoll
• Swains Island
• Western District (Tutuila island)

Body of water: South Pacific Ocean

Guam

The entire island of Guam is counted as one county-equivalent by the U.S. Census Bureau. Guam is at the southern end of the Mariana Islands chain.

• Guam

Body of water: Western Pacific Ocean

Northern Mariana Islands

The Northern Mariana Islands is divided into 4 county-equivalents by the U.S. Census Bureau (the 4 municipalities) — all of them are in the Mariana Islands:

• Northern Islands Municipality
• Rota
• Saipan
• Tinian

Body of water: Western Pacific Ocean

Puerto Rico

Main article: Municipalities of Puerto Rico

The 78 municipalities of Puerto Rico are counted as county-equivalents by the U.S. Census Bureau. All of these county-equivalents are on islands. Most are on the main island of Puerto Rico, but some are on other islands, such as Culebra and Vieques.

Body of water: Caribbean Sea

U.S. Virgin Islands

The U.S. Virgin Islands is divided into 3 county-equivalents: the 3 main islands. Some minor islands of the U.S. Virgin Islands (such as Water Island) are grouped administratively with one of the three main islands.

• Saint Croix Island
• Saint John Island
• Saint Thomas Island

Body of water: Caribbean Sea

U.S. Minor Outlying Islands

The U.S. Minor Outlying Islands is divided into 9 county-equivalents (8 island groups in the Pacific Ocean, and one island in the Caribbean Sea) — none of these islands have a permanent human population, though some (such as Wake Island) have temporary populations:

• Baker Island
• Howland Island
• Jarvis Island
• Johnston Atoll
• Kingman Reef
• Midway Atoll
• Navassa Island
• Palmyra Atoll
• Wake Island

Body of water: Pacific Ocean (except Navassa Island, which is in the Caribbean Sea)

External links

• United States Government
  • United States Census Bureau
  • United States Office of Management and Budget

This article "List of island counties of the United States" is from Wikipedia. The list of its authors can be seen in its historical and/or the page Edithistory:List of island counties of the United States. Articles copied from Draft Namespace on Wikipedia could be seen on the Draft Namespace of Wikipedia and not main one.

📰 Article(s) of the same category(ies)

• List of U.S. counties bordering eight or more counties
• List of U.S. metropolitan areas with large Foreign Born populations
• List of highest mean elevation U.S. counties
• List of U.S. cities with large South Asian/Indian-American populations
• List of primary statistical areas of the United States

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