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 geographical 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 of America 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. The specific governmental powers of counties 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, those counties in Connecticut, 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.
Drummond Township, which comprises Drummond Island, 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.
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.
Strathmere is an unincorporated community and census-designated place (CDP) located within Upper Township in Cape May County, in the U.S. state of New Jersey. As of the 2020 United States census, the CDP's population was 137, a decrease of 21 (−13.3%) from the 158 counted at the 2010 U.S. census, which reflected a decrease of 17 (−9.7%) from the 175 enumerated at the 2000 census.
Melville is a census-designated place (CDP) in the towns of Middletown and Portsmouth in Newport County, Rhode Island, United States. It lies along the shore of Narragansett Bay. The population of the CDP was 1,320 at the 2010 census. The CDP is named after Admiral George Wallace Melville. Past names for the area include Portsmouth Grove and Bradford.
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.
Valley Falls is a village and census-designated place (CDP) in the town of Cumberland, Providence County, Rhode Island, United States. The population was 12,094 at the 2020 census.
Ashaway is an unincorporated village and census-designated place (CDP) in the town of Hopkinton, Rhode Island, USA. It is a principal village of Hopkinton, along with Hope Valley, although it is the smaller of the two. The population was 1,485 at the 2010 census. The name Ashaway is derived from the American Indian name for the river that runs through the village, the Ashawague or Ashawaug, which means "land in the middle" or "land between" in the Niantic and Mohegan languages. The name "Ashawague River" appears as late as 1832 on the Findley map of Rhode Island published in Philadelphia.
Bradford is a census-designated place (CDP) and historic district in the towns of Westerly and Hopkinton in Washington County, Rhode Island, United States. The population was 1,406 at the 2010 census. The Bradford Village Historic District was listed on the National Register of Historic Places in 1996 as a 224-acre (91 ha) area including 149 contributing buildings, one other contributing site, and one other contributing structure. The CDP as defined by the United States Census Bureau is located only in Westerly.
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 along the Texas Gulf Coast 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.
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.
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