This is a list of islands of the United States, as ordered by area. It includes most islands with an area greater than 20 square miles (approximately 52 km2). Mainland areas cut by human-made canals are not considered islands.
This section of the list is not complete, although it should cover most of the islands in the United States over 20 square miles (52 km2).
The term "United States," when used in the geographic sense, refers to the contiguous United States, Alaska, Hawaii, the five insular territories of Puerto Rico, Northern Mariana Islands, U.S. Virgin Islands, Guam, American Samoa, and minor outlying possessions. The United States shares land borders with Canada and Mexico and maritime borders with Russia, Cuba, The Bahamas, and many other countries, mainly in the Caribbeanin addition to Canada and Mexico. The northern border of the United States with Canada is the world's longest bi-national land border.
The contiguous United States consists of the 48 adjoining U.S. states and the District of Columbia of the United States in central North America. The term excludes the only two non-contiguous states, which are Alaska and Hawaii, and all other offshore insular areas, such as the U.S. territories of American Samoa, Guam, the Northern Mariana Islands, Puerto Rico, and the U.S. Virgin Islands. The colloquial term "Lower 48" is also used, especially in relation to Alaska.
In the United States, a county or county equivalent is an administrative or political subdivision of a U.S. state or other territories of the United States which consists of a geographic area with specific boundaries and usually some level of governmental authority. The term "county" is used in 48 states, while Louisiana and Alaska have functionally equivalent subdivisions called parishes and boroughs, respectively. Counties and other local governments exist as a matter of U.S. state law, so the specific governmental powers of counties may vary widely between the states, with many providing some level of services to civil townships, municipalities, and unincorporated areas. Certain municipalities are in multiple counties; New York City is uniquely partitioned into five counties, referred to at the city government level as boroughs. Some municipalities have been consolidated with their county government to form consolidated city-counties, or have been legally separated from counties altogether to form independent cities. Conversely, counties in Connecticut and Rhode Island, eight of Massachusetts's 14 counties, and Alaska's Unorganized Borough have no government power, existing only as geographic distinctions.
Keweenaw County is a county in the western Upper Peninsula of the U.S. state of Michigan. As of the 2020 census, the county's population was 2,046, making it Michigan's least populous county. It is also the state's largest county by total area, including the waters of Lake Superior, as well as the state's northernmost county. The county seat is Eagle River.
Baldwin Park is a city located in the central San Gabriel Valley region of Los Angeles County, California, United States. As of the 2020 census, the population was 72,176, down from 75,390 at the 2010 census.
Drummond Township is a civil township of Chippewa County in the U.S. state of Michigan. The population was 973 at the 2020 census.
Eagle Harbor Township is a civil township of Keweenaw County in the U.S. state of Michigan. The population was 217 at the 2020 census. The township is located on the Keweenaw Peninsula and also includes the southwestern portion of Isle Royale National Park.
Houghton Township is a civil township of Keweenaw County in the U.S. state of Michigan. The population was 72 at the 2020 census.
Alaska Township is a township in Beltrami County, Minnesota, United States. The population was 197 as of the 2000 census. Alaska Township was named by settlers who had recently returned from a trip to Alaska.
Thomson Township is a township in Carlton County, Minnesota, United States. The population was 5,003 as of the 2010 census. Thomson Township took its name from the city of Thomson.
Silver Lake Township is a township in Martin County, Minnesota, United States. The population was 494 at the 2000 census.
Harrisville is a census-designated place (CDP) and village in the town of Burrillville in Providence County, Rhode Island, United States. The population was 1,605 at the 2010 census. Much of the community composes a historic district listed on the National Register of Historic Places. The village was named after nineteenth century manufacturer Andrew Harris. Previously, the village was named Rhodesville, after Captain William Rhodes, an eighteenth century privateer.
South Padre Island is a resort town in Cameron County, Texas, United States. It is part of the Brownsville–Harlingen Metropolitan Statistical Area. The population was 2,066 at the 2020 census. The town is located on South Padre Island, a barrier island with the Laguna Madre situated to the leeward of the island and the Gulf of Mexico on the windward flank, along the Texas Gulf Coast. South Padre Island is accessible via the Queen Isabella Causeway from the town of Port Isabel. South Padre Island is named after José Nicolás Ballí, a Catholic priest and settler.
Perkins Township is an unorganized territory in Sagadahoc County, Maine, United States. Originally incorporated as the town of Perkins, it was later abandoned, and has been uninhabited since the 1940s. The township comprises Swan Island, Little Swan Island and some tidal flats—all within the Kennebec River between the towns of Richmond and Dresden. The Swan Island Historic District comprises most of the township, with eight buildings, five structures and 1,500 acres (610 ha). Some of the buildings date to the 1750s. The district was added to the National Register of Historic Places in 1995. The entire township is now protected as the Steve Powell Wildlife Management Area, and is under the jurisdiction of the Maine Department of Inland Fisheries and Wildlife. Camping, hunting, fishing, and wildlife viewing are permitted between May and October; reservations are required.
In 45 of the 50 states of the United States, the county is used for the level of local government immediately below the state itself. Louisiana uses parishes, and Alaska uses boroughs. In Connecticut, Massachusetts, and Rhode Island, some or all counties within states have no governments of their own; the counties continue to exist as legal entities, however, and are used by states for some administrative functions and by the United States Census bureau for statistical analysis. There are 3,242 counties and county equivalent administrative units in total, including the District of Columbia and 100 county-equivalents in the U.S. territories.
Isle Royale is an island of the Great Lakes located in the northwest of Lake Superior and part of the U.S. state of Michigan. The island and the 450 surrounding smaller islands and waters make up Isle Royale National Park.
Copper Harbor is an unincorporated community and census-designated place (CDP) located in Keweenaw County in the U.S. state of Michigan. It is located within Grant Township. The population of the CDP was 136 as of the 2020 census.
Misquamicut is a census-designated place and fire district in southern Washington County, Rhode Island. It is part of the town of Westerly. The population was listed as 390 in 2010.
Padre Island comprises a total of 133,918 acres (541.95 km2) in Nueces, Kleberg, Willacy, Cameron, and Kenedy County, Texas.
Isle Royale National Park preserves 132,018 acres (534.26 km2) of land-based wilderness