List of islands of the United States by area

Last updated

Satellite image of the Big Island of Hawaii, the largest island in the United States. Hawai'i.jpg
Satellite image of the Big Island of Hawaii, the largest island in the United States.
Scale depiction of the 5 largest islands in the US, with some other significant islands Largest US Islands.jpg
Scale depiction of the 5 largest islands in the US, with some other significant islands

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.

Contents

Islands over 75 square miles (190 km2)

RankIsland's NameArea (sq mi)Area (km2)Location Population (2020) [1]
1 Hawaii Island 4,028 [2] 10,433 [2] Flag of Hawaii.svg Hawaii 200,629
2 Kodiak Island 3,588 [3] 9,293 [3] Flag of Alaska.svg Alaska 12,932 [4] [5]
3 Puerto Rico 3,513 [6] 9,100 [6] Flag of Puerto Rico.svg Puerto Rico 3,275,833 [7] [8]
4 Prince of Wales Island 2,5776,675 [9] [10] Flag of Alaska.svg Alaska 5,559
5 Chichagof Island 2,0805,3881,342
6 St. Lawrence Island 1,9835,1351,352
7 Admiralty Island 1,6844,362650
8 Nunivak Island 1,6254,209191
9 Unimak Island 1,5904,11935
10 Baranof Island 1,5704,065 [9] 8,532
11 Long Island 1,401 [11] 3,629 [11] Flag of New York.svg New York 7,568,304 [11]
12 Revillagigedo Island 1,1452,965 [10] Flag of Alaska.svg Alaska 13,477
13 Kupreanof Island 1,0862,813 [10] 584
14 Unalaska Island 1,0512,7221,759
15 Nelson Island 8432,1831,197
16 Kuiu Island 7581,962 [10] 10
17 Maui 727 [2] 1,883 [2] Flag of Hawaii.svg Hawaii 154,100
18 Afognak 6981,809Flag of Alaska.svg Alaska 169
19 Umnak 6921,79339
20 Oahu 597 [2] 1,545 [2] Flag of Hawaii.svg Hawaii 1,016,508
21 Kauai 552 [2] 1,430 [2] 73,214
22 Atka Island 4101,061Flag of Alaska.svg Alaska 61
23 Attu Island 3468960
24 Etolin Island 33687015
25 Montague Island 3057900
26 Adak Island 280725326
27 Molokai 260 [2] 673 [2] Flag of Hawaii.svg Hawaii 7,369
28 Dall Island 253655 [9] Flag of Alaska.svg Alaska 20
29 Wrangell Island 2165602,401
30 Mitkof Island 211546 [10] 3,364
31 Padre Island 209 [12] 542Flag of Texas.svg Texas 2,816
32 Guam 209541Flag of Guam.svg Guam 154,805
33 Isle Royale 206 [13] 534 [13] Flag of Michigan.svg Michigan 0
34 Tanaga Island 204529Flag of Alaska.svg Alaska 0
35 Zarembo Island 1854780
36 Unga Island 1774610
37 Amlia 1764590
38 Hinchinbrook Island 1704455
39 Kosciusko Island 16943852
40 Whidbey Island 169437Flag of Washington.svg Washington 58,211
41 Kruzof Island 168435Flag of Alaska.svg Alaska 0
42 Kanaga Island 1423690
43 Lanai 141 [2] 364 [2] Flag of Hawaii.svg Hawaii 3,367
44 St. Matthew Island 137354Flag of Alaska.svg Alaska 0
45 Annette Island 1323421,447
46 Akutan Island 129334713
47 Drummond Island 125 [14] 324Flag of Michigan.svg Michigan 1,058
48 Hagemeister Island 120312Flag of Alaska.svg Alaska 0
49 Nagai Island 1203100
50 Amchitka 1193090
51 Sitkalidak Island 1193090
52 Mount Desert Island 108 [15] 280 [15] Flag of Maine.svg Maine 10,424 [15]
53 Kiska 107278Flag of Alaska.svg Alaska 0
54 Knight Island 1012600
55 Marsh Island 100259Flag of Louisiana.svg Louisiana 0
56 Santa Cruz Island 98 [16] 254 [16] Flag of California.svg California 2
57 Gravina Island 95245Flag of Alaska.svg Alaska 50
58 Martha's Vineyard 91236Flag of Massachusetts.svg Massachusetts 14,901
59 Agattu 90234Flag of Alaska.svg Alaska 0
60 Semisopochnoi Island 862240
61 Johns Island 84217Flag of South Carolina.svg South Carolina 11,477
62 Seguam Island 83215Flag of Alaska.svg Alaska 1
63 Saint Croix 84212Flag of the United States Virgin Islands.svg U.S. Virgin Islands 53,234
64 Yakobi Island 82212Flag of Alaska.svg Alaska 0
65 Santa Rosa Island 81209Flag of California.svg California 2
66 Raspberry Island 77200Flag of Alaska.svg Alaska 2
67 Douglas Island 771995,297
68 Santa Catalina Island 75194Flag of California.svg California 3,696

Islands 5–75 square miles (13–194 km2)

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).

Island's NameArea (sq mi)Area (km2)LocationPopulationDensity (per km2)
Heceta Island 70181Flag of Alaska.svg Alaska 140.08
Niihau 70 [2] 180 [2] Flag of Hawaii.svg Hawaii 1600.9
Saipan 69180Flag of the Northern Mariana Islands.svg Northern Mariana Islands 62,392346
Tugidak Island 69180Flag of Alaska.svg Alaska 00
Edisto Island 68176Flag of South Carolina.svg South Carolina 2,30113
Hawkins Island 67175Flag of Alaska.svg Alaska 40.023
Yunaska Island 6717200
Sitkinak Island 6516900
Akun Island 6516800
Shuyak Island 6516800
Chuginadak Island 6516700
Sukkwan Island 6516790.05
Galveston Island 64166Flag of Texas.svg Texas 58,175350
Matagorda Island 6115700
Great Sitkin Island 60156Flag of Alaska.svg Alaska 00
Staten Island 59153Flag of New York.svg New York 443,7282,900
Deer Island 58152Flag of Alaska.svg Alaska 00
Duke Island 5714900
Orcas Island 57148Flag of Washington.svg Washington 4,45330.1
Cumberland Island 57147Flag of Georgia (U.S. state).svg  Georgia 00
San Clemente Island 57147Flag of California.svg California 00
Uganik Island 57147Flag of Alaska.svg Alaska 00
St. Michael Island 561459156.3
Stuart Island 5614500
Hilton Head Island 55144Flag of South Carolina.svg South Carolina 33,862235
Beaver Island 55144Flag of Michigan.svg Michigan 5513.8
San Juan Island 55143Flag of Washington.svg Washington 6,82247.7
Suemez Island 52135 [9] Flag of Alaska.svg Alaska 00
Tutuila 52135Flag of American Samoa.svg American Samoa 55,876413.9
Esther Island 52133Flag of Alaska.svg Alaska 310.23
Vieques 51132 [17] Flag of Puerto Rico.svg Puerto Rico 9,106 [17] 69
Sanak Island 50128Flag of Alaska.svg Alaska 00
Sugar Island 49128Flag of Michigan.svg Michigan 6525
Bois Blanc Island 49127710.56
Nantucket 48 [18] 124 [18] Flag of Massachusetts.svg Massachusetts 9,520 [18] 76.7
Davis Island 46120Flag of Louisiana.svg Louisiana Flag of Mississippi.svg Mississippi 00
Kagalaska Island 45116Flag of Alaska.svg Alaska 00
Kahoolawe 45 [2] 116 [2] Flag of Hawaii.svg Hawaii 00
Long Island 45115Flag of Alaska.svg Alaska 00
Chirikof Island 4411500
Wadmalaw Island 42109Flag of South Carolina.svg South Carolina 2,61123.9
Antelope Island 42109Flag of Utah.svg Utah 00
Dolgoi Island 41107Flag of Alaska.svg Alaska 00
Fidalgo Island 41107Flag of Washington.svg Washington 20,700193
Baker Island 41105 [9] Flag of Alaska.svg Alaska 00
Camano Island 40105Flag of Washington.svg Washington 13,358127
Saint Paul Island 40104Flag of Alaska.svg Alaska 5325
Sedanka Island 4010300
Deer Isle <40<102Flag of Maine.svg Maine <3,02829
Tinian 39102Flag of the Northern Mariana Islands.svg Northern Mariana Islands 3,54034.7
Aquidneck Island/Rhode Island 3898Flag of Rhode Island.svg Rhode Island 60,870621
Vashon Island 3796Flag of Washington.svg Washington 10,123105
Tigalda Island 3591Flag of Alaska.svg Alaska 00
Saint George Island 35901001.1
Catherine Island 348700
Hatteras Island 3486Flag of North Carolina.svg North Carolina 4,00146.5
Rota 3385Flag of the Northern Mariana Islands.svg Northern Mariana Islands 2,47729
Sauvie Island 3385Flag of Oregon.svg Oregon 1,07812.7
Grand Isle 3282Flag of Vermont.svg Vermont 3,65144.5
Kent Island 3282Flag of Maryland.svg Maryland 16,812205
Pine Island 3282Flag of Florida.svg Florida 8,235100
Saint Thomas 3281Flag of the United States Virgin Islands.svg U.S. Virgin Islands 51,181632
Coronation Island 3078Flag of Alaska.svg Alaska 00
Lopez Island 3077Flag of Washington.svg Washington 2,17728
Grand Island 2973Flag of New York.svg New York 18,621255
Bainbridge Island 2872Flag of Washington.svg Washington 20,308282
Gareloi Island 2667Flag of Alaska.svg Alaska 00
Little Sitkin Island 24.062.1Flag of Alaska.svg Alaska 00
Madeline Island 2462Flag of Wisconsin.svg Wisconsin 2463.9
Washington Island 24616009.8
Assateague Island 24.463Flag of Maryland.svg Maryland Flag of Virginia.svg Virginia 00
Vinalhaven Island 2361Flag of Maine.svg Maine 1,23520
Manhattan 2360Flag of New York.svg New York 1,537,19525,619
San Nicolas Island 2359Flag of California.svg California 00
Alameda Island 235973,8121,251
Marquette Island 2359Flag of Michigan.svg Michigan 00
Woronkofski Island 2359Flag of Alaska.svg Alaska 00
Grand Island 2258Flag of Michigan.svg Michigan 450.8
North Manitou Island 225800
Neebish Island 2256661.2
Mon Louis Island 21.355.3Flag of Alabama.svg Alabama
Oak Island 2153Flag of North Carolina.svg North Carolina 8,386158
Tuxekan Island 2053Flag of Alaska.svg Alaska 00
Saint John 2051Flag of the United States Virgin Islands.svg U.S. Virgin Islands 4,00778
St. Vincent Island 19.550.5Flag of Florida.svg Florida 00
Harstine Island 18.6548.3Flag of Washington.svg Washington 1,41229.4
Amelia Island 18.247.1Flag of Florida.svg Florida 10,716228
Pagan 1847Flag of the Northern Mariana Islands.svg Northern Mariana Islands 70.15
Roanoke Island 17.9546.5Flag of North Carolina.svg North Carolina 6,724144
Georgetown Island 17.445.0Flag of Maine.svg Maine 1,05823.5
Santa Rosa Island 17.244.6Flag of Florida.svg Florida
Taʻū 17.1144.31Flag of American Samoa.svg American Samoa 79017.8
Agrihan 17.0144.05Flag of the Northern Mariana Islands.svg Northern Mariana Islands 00
Sanibel Island 16.1841.90Flag of Florida.svg Florida 6,382152
Stockton Island 15.540Flag of Wisconsin.svg Wisconsin 00
Key Largo 15.2539.49Flag of Florida.svg Florida 12,447315
Fenwick Island 1538Flag of Delaware.svg Delaware Flag of Maryland.svg Maryland 8,002210.5
San Miguel Island 1538Flag of California.svg California 00
Anatahan 13.0933.91Flag of the Northern Mariana Islands.svg Northern Mariana Islands 00
Wellesley Island 1333Flag of New York.svg New York 36811
Segula Island 12.9633.58Flag of Alaska.svg Alaska 00
Islesboro Island 12.432.1Flag of Maine.svg Maine 58318.2
Outer Island 12.331.8Flag of Wisconsin.svg Wisconsin 00
Shelter Island 12.1931.58Flag of New York.svg New York 2,41376.4
Marco Island 12.131.5Flag of Florida.svg Florida 15,760500
St. George Island 11.730.399032.7
Culebra 11.6430.1Flag of Puerto Rico.svg Puerto Rico 1,31442.5
North Haven 11.630.1Flag of Maine.svg Maine 41713.9
Bogue Banks 11.329.1Flag of North Carolina.svg North Carolina ~6,600~22
Kiawah Island 11.1728.93Flag of South Carolina.svg South Carolina 1,76961.1
Swan's Island 10.928.4Flag of Maine.svg Maine 35512.5
Mockhorn Island 10.928.3Flag of Virginia.svg Virginia 00
Hawadax Island 10.7227.8Flag of Alaska.svg Alaska 00
Isle au Haut 10.727.6Flag of Maine.svg Maine 923.3
Marsh Island 10.226.4~7,000265
Grosse Ile 9.624.9Flag of Michigan.svg Michigan 10,894438
Sebascodegan Island 9.624.8Flag of Maine.svg Maine <5,000<200
Conanicut Island 9.425.1Flag of Rhode Island.svg Rhode Island 5,622224
Lummi Island 9.2524 Flag of Washington.svg Washington 822351
Block Island 925Flag of Rhode Island.svg Rhode Island 1,05142
Westport Island 8.8122.82Flag of Maine.svg Maine 71931.5
Cypress Island 8.622.3Flag of Washington.svg Washington 401.8
Guemes Island 8.622.360527
Ocracoke Island 8.622.3Flag of North Carolina.svg North Carolina 79735.7
Grindstone Island 8.522.1Flag of New York.svg New York ~20-700~0.9-32
Absecon Island 8.221.2Flag of New Jersey.svg New Jersey 57,4572,710
Grand Isle 8.1721.17Flag of Louisiana.svg Louisiana 1,00547.5
South Manitou Island 821Flag of Michigan.svg Michigan 00
Oak Island 7.920.3Flag of Wisconsin.svg Wisconsin 00
Garden Island 7.820.2Flag of Michigan.svg Michigan 00
Anderson Island 7.7520.1Flag of Washington.svg Washington 1,03751.6
Arrowsic Island 7.7520.07Flag of Maine.svg Maine 47723.8
Shaw Island 7.720Flag of Washington.svg Washington 24012
Bulls Island 7.6619.8Flag of South Carolina.svg South Carolina 00
Puget Island 7.519.4Flag of Washington.svg Washington 83142.8
Buldir Island 7.4519.3Flag of Alaska.svg Alaska 00
Naushon Island 7.419Flag of Massachusetts.svg Massachusetts 301.57
Mercer Island 717Flag of Washington.svg Washington 22,0361,296
McNeil Island 6.6317.221412.4
Grahams Island 6.6317.18Flag of North Dakota.svg North Dakota
Sugar Island 6.57517.03Flag of Maine.svg Maine 00
Blakely Island 6.516.9Flag of Washington.svg Washington 563.3
Chincoteague Island 6.4116.6Flag of Virginia.svg Virginia 2,875449
Marrowstone Island 6.316.4Flag of Washington.svg Washington 84451.5
Dauphin Island 6.2616.2Flag of Alabama.svg Alabama 1,37184.6
Verona Island 6.2416.16Flag of Maine.svg Maine 50731.4
Hall Island (Alaska ) 6.216.06Alaska00
Shemya 5.915.3Flag of Alaska.svg Alaska 00
Prudence Island 5.5714.43Flag of Rhode Island.svg Rhode Island 27819.3
South Core Banks 5.514.2Flag of North Carolina.svg North Carolina 00
High Island (Michigan) 5.514.1Flag of Michigan.svg Michigan 00
South Fox Island 5.413.900
Blakeley Island 5.3613.88Flag of Alabama.svg Alabama
Wallops Island 5.2413.6Flag of Virginia.svg Virginia
Fox Island 5.213.5Flag of Washington.svg Washington 3,921290
Gardiners Island 5.18413.43Flag of New York.svg New York 00

See also

References

  1. "2020 Census - Census Tract Reference Map". U.S. Census Bureau. January 2020. Retrieved August 7, 2025.
  2. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 "Table 5.08 - Land Area of Islands: 2000" (PDF). The State of Hawaii Data Book 2004. State of Hawaii. 2004. Retrieved October 25, 2007.
  3. 1 2 "Kodiak Island". Encyclopædia Britannica (Britannica Concise ed.). Encyclopædia Britannica, Inc. 2007. 9369330. Archived from the original on January 17, 2008. Retrieved October 28, 2007.
  4. "P1 | TOTAL POPULATION". data.census.gov. Retrieved August 8, 2025.
  5. Not including 169 residents of the borough who lived outside of the island itself.
  6. 1 2 "State Area Measurements and Internal Point Coordinates". United States Census Bureau. Retrieved February 24, 2024.
  7. "P1 | TOTAL POPULATION". US Census Bureau. Retrieved August 15, 2025.
  8. "Table 2. Resident Population for the 50 States, the District of Columbia, and Puerto Rico: 2020 Census" (PDF). United States Census Bureau. April 26, 2021. Retrieved April 26, 2021.
  9. 1 2 3 4 5 Carrara, Paul E.; Ager, Thomas A.; Baichtal, James F.; VanSistine, D. Paco (2003). "Miscellaneous Field Studies Map MF–2424" (PDF). Map of Glacial Limits and Possible Refugia in the Southern Alexander Archipelago, Alaska, During the Late Wisconsin Glaciation. Denver, Colorado: United States Geological Survey . Retrieved October 24, 2007.
  10. 1 2 3 4 5 Peacock, Elizabeth (December 13, 2004). "Kuiu". Glaciers, Mountains, and Salt Water: Assessing Barriers to Movement of a Vagile Species. Reno, Nevada: Alaska Department of Fish and Game . Retrieved October 29, 2007.
  11. 1 2 3 "Long Island". Encyclopædia Britannica (Britannica Concise ed.). Encyclopædia Britannica, Inc. 2007. 9370515. Archived from the original on November 5, 2007. Retrieved October 29, 2007.
  12. "Padre Island". Handbook of Texas Online. University of Texas . Retrieved November 12, 2007. Padre Island comprises a total of 133,918 acres (541.95 km2) in Nueces, Kleberg, Willacy, Cameron, and Kenedy County, Texas.
  13. 1 2 "Isle Royale National Park - Nature & Science". Isle Royale National Park. National Park Service. July 25, 2006. Retrieved October 29, 2007. Isle Royale National Park preserves 132,018 acres (534.26 km2) of land-based wilderness
  14. Drummond Island comprises the bulk of Drummond Township, Chippewa County, Michigan. According to the U.S. Census Bureau, the land area of Drummond Township is 334.3 km2, or 249.1 mi2, and its population was 1,049 in 2017. The township includes a number of apparently uninhabited smaller islands in Potagannissing Bay, and their estimated combined area is not more than four mi2.
  15. 1 2 3 "Mount Desert Island". Encyclopædia Britannica . Encyclopædia Britannica, Inc. 2007. 9054016. Retrieved October 29, 2007.
  16. 1 2 "Channel Islands". Encyclopædia Britannica (Britannica Concise ed.). Encyclopædia Britannica, Inc. 2007. 9360314. Archived from the original on June 4, 2006. Retrieved October 29, 2007.
  17. 1 2 "PUERTO RICO FACTS and HISTORY". U.S. Census Bureau. Archived from the original on February 12, 2020. Retrieved May 23, 2008.
  18. 1 2 3 "Nantucket". Encyclopædia Britannica . Encyclopædia Britannica, Inc. 2007. 9054798. Retrieved October 29, 2007.