List Of Islands Of Montana
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There are at least 115 named Islands in
Montana Montana ( ) is a landlocked U.S. state, state in the Mountain states, Mountain West subregion of the Western United States. It is bordered by Idaho to the west, North Dakota to the east, South Dakota to the southeast, Wyoming to the south, an ...
. These islands occur in
river A river is a natural stream of fresh water that flows on land or inside Subterranean river, caves towards another body of water at a lower elevation, such as an ocean, lake, or another river. A river may run dry before reaching the end of ...
s,
lake A lake is often a naturally occurring, relatively large and fixed body of water on or near the Earth's surface. It is localized in a basin or interconnected basins surrounded by dry land. Lakes lie completely on land and are separate from ...
s and
reservoirs A reservoir (; ) is an enlarged lake behind a dam, usually built to store fresh water, often doubling for hydroelectric power generation. Reservoirs are created by controlling a watercourse that drains an existing body of water, interrup ...
.


Islands east of the

Continental Divide A continental divide is a drainage divide on a continent such that the drainage basin on one side of the divide feeds into one ocean or sea, and the basin on the other side either feeds into a different ocean or sea, or else is endorheic, not ...


Missouri River The Missouri River is a river in the Central United States, Central and Mountain states, Mountain West regions of the United States. The nation's longest, it rises in the eastern Centennial Mountains of the Bitterroot Range of the Rocky Moun ...

* Archers Island,
Chouteau County, Montana Chouteau County is a county located in the North-Central region of the U.S. state of Montana. As of the 2020 census, the population was 5,895. Its county seat is Fort Benton. The county was established in 1865 as one of the original nine coun ...
, , el. * Baker Bar,
Chouteau County, Montana Chouteau County is a county located in the North-Central region of the U.S. state of Montana. As of the 2020 census, the population was 5,895. Its county seat is Fort Benton. The county was established in 1865 as one of the original nine coun ...
, , el. * Boggs Island,
Chouteau County, Montana Chouteau County is a county located in the North-Central region of the U.S. state of Montana. As of the 2020 census, the population was 5,895. Its county seat is Fort Benton. The county was established in 1865 as one of the original nine coun ...
, , el. * Brule Bar,
Chouteau County, Montana Chouteau County is a county located in the North-Central region of the U.S. state of Montana. As of the 2020 census, the population was 5,895. Its county seat is Fort Benton. The county was established in 1865 as one of the original nine coun ...
, , el. * Buckshot Island,
Cascade County, Montana Cascade County (''cascade'' means ''waterfall'' in French) is a county located in the U.S. state of Montana. As of the 2020 census, the population was 84,414, making it the fifth-most populous county in Montana. Its county seat is Great Fa ...
, , el. * Chelsea Island,
Roosevelt County, Montana Roosevelt County is a county in the U.S. state of Montana. As of the 2020 census, the population was 10,794. Its county seat is Wolf Point. Roosevelt County was created by the Montana Legislature in 1919 from a portion of Sheridan County. ...
, , el. * Council Island,
Chouteau County, Montana Chouteau County is a county located in the North-Central region of the U.S. state of Montana. As of the 2020 census, the population was 5,895. Its county seat is Fort Benton. The county was established in 1865 as one of the original nine coun ...
, , el. * Cow Island,
Blaine County, Montana Blaine County is a county in the U.S. state of Montana. As of the 2020 census, the population was 7,044. Its county seat is Chinook. The county was named for James G. Blaine, former United States Secretary of State. It is on the north line o ...
, , el. * Crow Coulee Bar,
Chouteau County, Montana Chouteau County is a county located in the North-Central region of the U.S. state of Montana. As of the 2020 census, the population was 5,895. Its county seat is Fort Benton. The county was established in 1865 as one of the original nine coun ...
, , el. * Duck Island, Valley County, Montana, , el. * Evans Bend,
Chouteau County, Montana Chouteau County is a county located in the North-Central region of the U.S. state of Montana. As of the 2020 census, the population was 5,895. Its county seat is Fort Benton. The county was established in 1865 as one of the original nine coun ...
, , el. * Fisher Island,
Cascade County, Montana Cascade County (''cascade'' means ''waterfall'' in French) is a county located in the U.S. state of Montana. As of the 2020 census, the population was 84,414, making it the fifth-most populous county in Montana. Its county seat is Great Fa ...
, , el. * Grand Island,
Phillips County, Montana Phillips County is a County (United States), county in the U.S. state of Montana. As of the 2020 United States census, 2020 census, the population was 4,217. Its county seat is Malta, Montana, Malta. Before February 5, 1915, Phillips County was ...
, , el. * Holmes Council Islands,
Fergus County, Montana Fergus County is a County (United States), county in the U.S. state of Montana. As of the 2020 United States census, 2020 census, the population was 11,446. Its county seat is Lewistown, Montana, Lewistown. The county was founded in 1885 and na ...
, , el. * Iron City Islands,
Fergus County, Montana Fergus County is a County (United States), county in the U.S. state of Montana. As of the 2020 United States census, 2020 census, the population was 11,446. Its county seat is Lewistown, Montana, Lewistown. The county was founded in 1885 and na ...
, , el. * Jones Island,
Phillips County, Montana Phillips County is a County (United States), county in the U.S. state of Montana. As of the 2020 United States census, 2020 census, the population was 4,217. Its county seat is Malta, Montana, Malta. Before February 5, 1915, Phillips County was ...
, , el. * King Island,
Fergus County, Montana Fergus County is a County (United States), county in the U.S. state of Montana. As of the 2020 United States census, 2020 census, the population was 11,446. Its county seat is Lewistown, Montana, Lewistown. The county was founded in 1885 and na ...
, , el. * Lower Two Calf Island,
Phillips County, Montana Phillips County is a County (United States), county in the U.S. state of Montana. As of the 2020 United States census, 2020 census, the population was 4,217. Its county seat is Malta, Montana, Malta. Before February 5, 1915, Phillips County was ...
, , el. * Nelson Island,
Cascade County, Montana Cascade County (''cascade'' means ''waterfall'' in French) is a county located in the U.S. state of Montana. As of the 2020 census, the population was 84,414, making it the fifth-most populous county in Montana. Its county seat is Great Fa ...
, , el. * PN Island,
Fergus County, Montana Fergus County is a County (United States), county in the U.S. state of Montana. As of the 2020 United States census, 2020 census, the population was 11,446. Its county seat is Lewistown, Montana, Lewistown. The county was founded in 1885 and na ...
, , el. * Park Island,
Cascade County, Montana Cascade County (''cascade'' means ''waterfall'' in French) is a county located in the U.S. state of Montana. As of the 2020 census, the population was 84,414, making it the fifth-most populous county in Montana. Its county seat is Great Fa ...
, , el. * Pine Island,
Cascade County, Montana Cascade County (''cascade'' means ''waterfall'' in French) is a county located in the U.S. state of Montana. As of the 2020 census, the population was 84,414, making it the fifth-most populous county in Montana. Its county seat is Great Fa ...
, , el. * Pablo Island,
Chouteau County, Montana Chouteau County is a county located in the North-Central region of the U.S. state of Montana. As of the 2020 census, the population was 5,895. Its county seat is Fort Benton. The county was established in 1865 as one of the original nine coun ...
, , el. * Roosevelt Island,
Chouteau County, Montana Chouteau County is a county located in the North-Central region of the U.S. state of Montana. As of the 2020 census, the population was 5,895. Its county seat is Fort Benton. The county was established in 1865 as one of the original nine coun ...
, , el. * Sacajawea Island,
Cascade County, Montana Cascade County (''cascade'' means ''waterfall'' in French) is a county located in the U.S. state of Montana. As of the 2020 census, the population was 84,414, making it the fifth-most populous county in Montana. Its county seat is Great Fa ...
, , el. * Scout Island, Valley County, Montana, , el. * Shonkin Bar,
Chouteau County, Montana Chouteau County is a county located in the North-Central region of the U.S. state of Montana. As of the 2020 census, the population was 5,895. Its county seat is Fort Benton. The county was established in 1865 as one of the original nine coun ...
, , el. * Skinners Island,
Roosevelt County, Montana Roosevelt County is a county in the U.S. state of Montana. As of the 2020 census, the population was 10,794. Its county seat is Wolf Point. Roosevelt County was created by the Montana Legislature in 1919 from a portion of Sheridan County. ...
, , el. * Steamboat Island,
Cascade County, Montana Cascade County (''cascade'' means ''waterfall'' in French) is a county located in the U.S. state of Montana. As of the 2020 census, the population was 84,414, making it the fifth-most populous county in Montana. Its county seat is Great Fa ...
, , el. * Sturgeon Island,
Blaine County, Montana Blaine County is a county in the U.S. state of Montana. As of the 2020 census, the population was 7,044. Its county seat is Chinook. The county was named for James G. Blaine, former United States Secretary of State. It is on the north line o ...
, , el. * Taylor Island,
Cascade County, Montana Cascade County (''cascade'' means ''waterfall'' in French) is a county located in the U.S. state of Montana. As of the 2020 census, the population was 84,414, making it the fifth-most populous county in Montana. Its county seat is Great Fa ...
, , el. * Three Islands,
Chouteau County, Montana Chouteau County is a county located in the North-Central region of the U.S. state of Montana. As of the 2020 census, the population was 5,895. Its county seat is Fort Benton. The county was established in 1865 as one of the original nine coun ...
, , el. * Upper Two Calf Island,
Phillips County, Montana Phillips County is a County (United States), county in the U.S. state of Montana. As of the 2020 United States census, 2020 census, the population was 4,217. Its county seat is Malta, Montana, Malta. Before February 5, 1915, Phillips County was ...
, , el. * White Shield Island,
Roosevelt County, Montana Roosevelt County is a county in the U.S. state of Montana. As of the 2020 census, the population was 10,794. Its county seat is Wolf Point. Roosevelt County was created by the Montana Legislature in 1919 from a portion of Sheridan County. ...
, , el. * Wolf Island,
Chouteau County, Montana Chouteau County is a county located in the North-Central region of the U.S. state of Montana. As of the 2020 census, the population was 5,895. Its county seat is Fort Benton. The county was established in 1865 as one of the original nine coun ...
, , el. * Yorks Islands,
Broadwater County, Montana Broadwater County is a county in the U.S. state of Montana. As of the 2020 census, the population was 6,774. Its county seat is Townsend. The county was named for Charles Arthur Broadwater, a noted Montana railroad, real estate, and banking ...
, , el.


Yellowstone River The Yellowstone River is a tributary of the Missouri River, approximately long, in the Western United States. Considered the principal tributary of the upper Missouri, via its own tributaries it drains an area with headwaters across the mountain ...

* Beaver Island,
Richland County, Montana Richland County is a county in the U.S. state of Montana. As of the 2020 census, the population was 11,491. Its county seat is Sidney. Richland County was created by the Montana Legislature in 1914 from part of Dawson County. An early propo ...
, , el. * Big Marys Island,
Yellowstone County, Montana Yellowstone County is the most populous county in the U.S. state of Montana. As of the 2020 census, the population was 164,731. Its county seat is Billings, the state's most populous city. Like the nearby national park, Yellowstone County ...
, , el. * Breakneck Island,
Richland County, Montana Richland County is a county in the U.S. state of Montana. As of the 2020 census, the population was 11,491. Its county seat is Sidney. Richland County was created by the Montana Legislature in 1914 from part of Dawson County. An early propo ...
, , el. * Buella Island,
Richland County, Montana Richland County is a county in the U.S. state of Montana. As of the 2020 census, the population was 11,491. Its county seat is Sidney. Richland County was created by the Montana Legislature in 1914 from part of Dawson County. An early propo ...
, , el. * Cherry Island,
Yellowstone County, Montana Yellowstone County is the most populous county in the U.S. state of Montana. As of the 2020 census, the population was 164,731. Its county seat is Billings, the state's most populous city. Like the nearby national park, Yellowstone County ...
, , el. * Chrome Island,
Wibaux County, Montana Wibaux County ( ) is a county in the U.S. state of Montana. As of the 2020 census, the population was 937, making it the fourth-least populous county in Montana. Its county seat is Wibaux. History Wibaux County was created by the Montana Leg ...
, , el. * Crittenden Island,
Richland County, Montana Richland County is a county in the U.S. state of Montana. As of the 2020 census, the population was 11,491. Its county seat is Sidney. Richland County was created by the Montana Legislature in 1914 from part of Dawson County. An early propo ...
, , el. * Devils Island,
Richland County, Montana Richland County is a county in the U.S. state of Montana. As of the 2020 census, the population was 11,491. Its county seat is Sidney. Richland County was created by the Montana Legislature in 1914 from part of Dawson County. An early propo ...
, , el. * Diamond Island,
Richland County, Montana Richland County is a county in the U.S. state of Montana. As of the 2020 census, the population was 11,491. Its county seat is Sidney. Richland County was created by the Montana Legislature in 1914 from part of Dawson County. An early propo ...
, , el. * Dovers Island,
Yellowstone County, Montana Yellowstone County is the most populous county in the U.S. state of Montana. As of the 2020 census, the population was 164,731. Its county seat is Billings, the state's most populous city. Like the nearby national park, Yellowstone County ...
, , el. * Duck Island,
Richland County, Montana Richland County is a county in the U.S. state of Montana. As of the 2020 census, the population was 11,491. Its county seat is Sidney. Richland County was created by the Montana Legislature in 1914 from part of Dawson County. An early propo ...
, , el. * Elk Island,
Richland County, Montana Richland County is a county in the U.S. state of Montana. As of the 2020 census, the population was 11,491. Its county seat is Sidney. Richland County was created by the Montana Legislature in 1914 from part of Dawson County. An early propo ...
, , el. * Elms Island,
Richland County, Montana Richland County is a county in the U.S. state of Montana. As of the 2020 census, the population was 11,491. Its county seat is Sidney. Richland County was created by the Montana Legislature in 1914 from part of Dawson County. An early propo ...
, , el. * Government Island,
Yellowstone County, Montana Yellowstone County is the most populous county in the U.S. state of Montana. As of the 2020 census, the population was 164,731. Its county seat is Billings, the state's most populous city. Like the nearby national park, Yellowstone County ...
, , el. * Gros Ventre Island,
Richland County, Montana Richland County is a county in the U.S. state of Montana. As of the 2020 census, the population was 11,491. Its county seat is Sidney. Richland County was created by the Montana Legislature in 1914 from part of Dawson County. An early propo ...
, , el. * Idiom Island,
Richland County, Montana Richland County is a county in the U.S. state of Montana. As of the 2020 census, the population was 11,491. Its county seat is Sidney. Richland County was created by the Montana Legislature in 1914 from part of Dawson County. An early propo ...
, , el. * Howery Island, Treasure County, Montana, , el. * Joes Island,
Dawson County, Montana Dawson County is a county located in the U.S. state of Montana. As of the 2020 census, the population was 8,940. Its county seat is Glendive. History Dawson County was the tenth county organized in Montana Territory. It was created January 1 ...
, , el. * Livingston Island,
Park County, Montana Park County is a county in the U.S. state of Montana. At the 2020 census, the population was 17,191. Its county seat is Livingston. A small part of Yellowstone National Park is in the southern part of the county. History The Territorial Leg ...
, , el. * Marys Island,
Richland County, Montana Richland County is a county in the U.S. state of Montana. As of the 2020 census, the population was 11,491. Its county seat is Sidney. Richland County was created by the Montana Legislature in 1914 from part of Dawson County. An early propo ...
, , el. * Monroe Island,
Dawson County, Montana Dawson County is a county located in the U.S. state of Montana. As of the 2020 census, the population was 8,940. Its county seat is Glendive. History Dawson County was the tenth county organized in Montana Territory. It was created January 1 ...
, , el. * Pirogue Island,
Custer County, Montana Custer County is a county located in the southeast part of the U.S. state of Montana. As of the 2020 U.S. census, the population was 11,867. Its county seat and largest town is Miles City. The county was established after the end of the Amer ...
, , el. * Randalls Island,
Yellowstone County, Montana Yellowstone County is the most populous county in the U.S. state of Montana. As of the 2020 census, the population was 164,731. Its county seat is Billings, the state's most populous city. Like the nearby national park, Yellowstone County ...
, , el. * Schaffer Island,
Dawson County, Montana Dawson County is a county located in the U.S. state of Montana. As of the 2020 census, the population was 8,940. Its county seat is Glendive. History Dawson County was the tenth county organized in Montana Territory. It was created January 1 ...
, , el. * Seven Sisters Island,
Richland County, Montana Richland County is a county in the U.S. state of Montana. As of the 2020 census, the population was 11,491. Its county seat is Sidney. Richland County was created by the Montana Legislature in 1914 from part of Dawson County. An early propo ...
, , el. * Siebeck Island,
Park County, Montana Park County is a county in the U.S. state of Montana. At the 2020 census, the population was 17,191. Its county seat is Livingston. A small part of Yellowstone National Park is in the southern part of the county. History The Territorial Leg ...
, , el. * Snake Island,
Richland County, Montana Richland County is a county in the U.S. state of Montana. As of the 2020 census, the population was 11,491. Its county seat is Sidney. Richland County was created by the Montana Legislature in 1914 from part of Dawson County. An early propo ...
, , el. * Spraklin Island,
Yellowstone County, Montana Yellowstone County is the most populous county in the U.S. state of Montana. As of the 2020 census, the population was 164,731. Its county seat is Billings, the state's most populous city. Like the nearby national park, Yellowstone County ...
, , el. * Westover Island, Carbon County, Montana, , el.


Other waters east of the divide

* Big Island,
Sheridan County, Montana Sheridan County is a county in the U.S. state of Montana. As of the 2020 census, the population was 3,539. Its county seat is Plentywood. Its northern boundary is the Canada–United States border south of Saskatchewan. History The Montana ...
, , el. in Medicine Lake * Bruces Island,
Sheridan County, Montana Sheridan County is a county in the U.S. state of Montana. As of the 2020 census, the population was 3,539. Its county seat is Plentywood. Its northern boundary is the Canada–United States border south of Saskatchewan. History The Montana ...
, , el. in Medicine Lake * Far West Island,
Big Horn County, Montana Big Horn County is a county located in the U.S. state of Montana. As of the 2020 census, the population was 13,124. The county seat is Hardin. The county, like the river and the mountain range, is named after the bighorn sheep in the Rocky M ...
, , el. in the
Big Horn River The Bighorn River is a tributary of the Yellowstone, approximately long, in the states of Wyoming and Montana in the western United States. The river was named in 1805 by fur trader François Larocque for the bighorn sheep he saw along its b ...
* Fire Island,
Sweet Grass County, Montana Sweet Grass County is a county located in the U.S. state of Montana. As of the 2020 census, the population was 3,678. Its county seat is Big Timber. The county was founded in 1895. History The Montana Legislature authorized Sweet Grass Coun ...
, , el. in the Boulder River * Gull Island,
Sheridan County, Montana Sheridan County is a county in the U.S. state of Montana. As of the 2020 census, the population was 3,539. Its county seat is Plentywood. Its northern boundary is the Canada–United States border south of Saskatchewan. History The Montana ...
, , el. in Medicine Lake * Long Island,
Phillips County, Montana Phillips County is a County (United States), county in the U.S. state of Montana. As of the 2020 United States census, 2020 census, the population was 4,217. Its county seat is Malta, Montana, Malta. Before February 5, 1915, Phillips County was ...
, , el. in Lake Bowdoin * Lovell Island,
Beaverhead County, Montana Beaverhead County is the largest county by area in the U.S. state of Montana. As of the 2020 census, the population was 9,371. Its county seat is Dillon. The county was founded in 1865. Much of the perimeter of the county is the Continental ...
, , el. in the Beaverhead River * Pelican Islands,
Phillips County, Montana Phillips County is a County (United States), county in the U.S. state of Montana. As of the 2020 United States census, 2020 census, the population was 4,217. Its county seat is Malta, Montana, Malta. Before February 5, 1915, Phillips County was ...
, , el. in Lake Bowdoin * Smith Island,
Beaverhead County, Montana Beaverhead County is the largest county by area in the U.S. state of Montana. As of the 2020 census, the population was 9,371. Its county seat is Dillon. The county was founded in 1865. Much of the perimeter of the county is the Continental ...
, , el. in the Beaverhead River * The Island,
Carter County, Montana Carter County is a County (United States), county located in the U.S. state of Montana. As of the 2020 United States census, 2020 census, the population was 1,415, making it the seventh-least populous county in Montana. The county seat is Ekal ...
, , el. in the Little Missouri River * Thunderbird Island,
Glacier County, Montana Glacier County is located in the U.S. state of Montana. As of the 2020 census, the population was 13,778. The county is located in northwestern Montana between the Great Plains and the Rocky Mountains, known to the Blackfeet as the "Backbone ...
, , el. in
Saint Mary Lake Saint Mary Lake is the second-largest lake in Glacier National Park (U.S.), Glacier National Park, in the U.S. state of Montana. Located on the east side of the park, Going-to-the-Sun Road parallels the lake along its north shore. At an elevatio ...
* Youngs Island,
Sheridan County, Montana Sheridan County is a county in the U.S. state of Montana. As of the 2020 census, the population was 3,539. Its county seat is Plentywood. Its northern boundary is the Canada–United States border south of Saskatchewan. History The Montana ...
, , el. in Medicine Lake * Wild Goose Island,
Glacier County, Montana Glacier County is located in the U.S. state of Montana. As of the 2020 census, the population was 13,778. The county is located in northwestern Montana between the Great Plains and the Rocky Mountains, known to the Blackfeet as the "Backbone ...
, , el. in
Saint Mary Lake Saint Mary Lake is the second-largest lake in Glacier National Park (U.S.), Glacier National Park, in the U.S. state of Montana. Located on the east side of the park, Going-to-the-Sun Road parallels the lake along its north shore. At an elevatio ...
* Woody Island,
Phillips County, Montana Phillips County is a County (United States), county in the U.S. state of Montana. As of the 2020 United States census, 2020 census, the population was 4,217. Its county seat is Malta, Montana, Malta. Before February 5, 1915, Phillips County was ...
, , el. in Lake Bowdoin * York Island,
Garfield County, Montana Garfield County is a county located in the U.S. state of Montana. As of the 2020 census, the population was 1,173. Its county seat is Jordan. Garfield County is noteworthy as the site of the discovery and excavation of four of the world's doz ...
, , el. in Fort Peck Lake


Islands west of the Continental Divide


Flathead Lake Flathead Lake (, ) is a large natural lake in northwest Montana, United States. The lake is a remnant of the ancient, massive glacial dammed lake, Glacial Lake Missoula, Lake Missoula, of the era of the last interglacial. Flathead Lake is a nat ...

* Bird Island,
Lake County, Montana Lake County is a County (United States), county located in the northwest part of the U.S. state of Montana. As of the 2020 United States census, 2020 census, the population was 31,134. Its county seat is Polson, Montana, Polson. Geography Acco ...
, , el. * Bull Island,
Lake County, Montana Lake County is a County (United States), county located in the northwest part of the U.S. state of Montana. As of the 2020 United States census, 2020 census, the population was 31,134. Its county seat is Polson, Montana, Polson. Geography Acco ...
, , el. * Cedar Island,
Lake County, Montana Lake County is a County (United States), county located in the northwest part of the U.S. state of Montana. As of the 2020 United States census, 2020 census, the population was 31,134. Its county seat is Polson, Montana, Polson. Geography Acco ...
, , el. * Cromwell Island,
Lake County, Montana Lake County is a County (United States), county located in the northwest part of the U.S. state of Montana. As of the 2020 United States census, 2020 census, the population was 31,134. Its county seat is Polson, Montana, Polson. Geography Acco ...
, , el. * Douglas Islands,
Lake County, Montana Lake County is a County (United States), county located in the northwest part of the U.S. state of Montana. As of the 2020 United States census, 2020 census, the population was 31,134. Its county seat is Polson, Montana, Polson. Geography Acco ...
, , el. * Dream Island,
Lake County, Montana Lake County is a County (United States), county located in the northwest part of the U.S. state of Montana. As of the 2020 United States census, 2020 census, the population was 31,134. Its county seat is Polson, Montana, Polson. Geography Acco ...
, , el. * Goose Island,
Lake County, Montana Lake County is a County (United States), county located in the northwest part of the U.S. state of Montana. As of the 2020 United States census, 2020 census, the population was 31,134. Its county seat is Polson, Montana, Polson. Geography Acco ...
, , el. * Invitation Island,
Flathead County, Montana Flathead County is a County (United States), county located in the U.S. state of Montana. At the 2020 United States census, 2020 census, its population was 104,357, making it the state's fourth most populous county. Its county seat is Kalispell ...
, , el. * Melita Island,
Lake County, Montana Lake County is a County (United States), county located in the northwest part of the U.S. state of Montana. As of the 2020 United States census, 2020 census, the population was 31,134. Its county seat is Polson, Montana, Polson. Geography Acco ...
, , el. * Little Bull Island,
Lake County, Montana Lake County is a County (United States), county located in the northwest part of the U.S. state of Montana. As of the 2020 United States census, 2020 census, the population was 31,134. Its county seat is Polson, Montana, Polson. Geography Acco ...
, , el. * Mary B Island,
Lake County, Montana Lake County is a County (United States), county located in the northwest part of the U.S. state of Montana. As of the 2020 United States census, 2020 census, the population was 31,134. Its county seat is Polson, Montana, Polson. Geography Acco ...
, , el. * Rock Island,
Lake County, Montana Lake County is a County (United States), county located in the northwest part of the U.S. state of Montana. As of the 2020 United States census, 2020 census, the population was 31,134. Its county seat is Polson, Montana, Polson. Geography Acco ...
, , el. * Shelter Island,
Lake County, Montana Lake County is a County (United States), county located in the northwest part of the U.S. state of Montana. As of the 2020 United States census, 2020 census, the population was 31,134. Its county seat is Polson, Montana, Polson. Geography Acco ...
, , el. * Wild Horse Island,
Lake County, Montana Lake County is a County (United States), county located in the northwest part of the U.S. state of Montana. As of the 2020 United States census, 2020 census, the population was 31,134. Its county seat is Polson, Montana, Polson. Geography Acco ...
, , el.


Hungry Horse Reservoir

* Clayton Island,
Flathead County, Montana Flathead County is a County (United States), county located in the U.S. state of Montana. At the 2020 United States census, 2020 census, its population was 104,357, making it the state's fourth most populous county. Its county seat is Kalispell ...
, , el. * Elk Island,
Flathead County, Montana Flathead County is a County (United States), county located in the U.S. state of Montana. At the 2020 United States census, 2020 census, its population was 104,357, making it the state's fourth most populous county. Its county seat is Kalispell ...
, , el. * Fire Island,
Flathead County, Montana Flathead County is a County (United States), county located in the U.S. state of Montana. At the 2020 United States census, 2020 census, its population was 104,357, making it the state's fourth most populous county. Its county seat is Kalispell ...
, , el. * Kelly Island,
Flathead County, Montana Flathead County is a County (United States), county located in the U.S. state of Montana. At the 2020 United States census, 2020 census, its population was 104,357, making it the state's fourth most populous county. Its county seat is Kalispell ...
, , el. * Lost Island,
Flathead County, Montana Flathead County is a County (United States), county located in the U.S. state of Montana. At the 2020 United States census, 2020 census, its population was 104,357, making it the state's fourth most populous county. Its county seat is Kalispell ...
, , el.


Lake Koocanusa Lake Koocanusa () is a reservoir in British Columbia (Canada) and Montana (United States) formed by the damming of the Kootenai River by the Libby Dam in 1972. The Dam was formally dedicated by President Gerald Ford on August 24, 1975. The ...

* Cedar Island,
Lincoln County, Montana Lincoln County is a county located in the U.S. state of Montana. As of the 2020 census, the population was 19,677. Its county seat is Libby. The county was founded in 1909 and named for President Abraham Lincoln. The county lies on Montana's ...
, , el. * Kins Island,
Lincoln County, Montana Lincoln County is a county located in the U.S. state of Montana. As of the 2020 census, the population was 19,677. Its county seat is Libby. The county was founded in 1909 and named for President Abraham Lincoln. The county lies on Montana's ...
, , el. * Murray Island,
Lincoln County, Montana Lincoln County is a county located in the U.S. state of Montana. As of the 2020 census, the population was 19,677. Its county seat is Libby. The county was founded in 1909 and named for President Abraham Lincoln. The county lies on Montana's ...
, , el. * Whites Island,
Lincoln County, Montana Lincoln County is a county located in the U.S. state of Montana. As of the 2020 census, the population was 19,677. Its county seat is Libby. The county was founded in 1909 and named for President Abraham Lincoln. The county lies on Montana's ...
, , el. * Yarnell Island,
Lincoln County, Montana Lincoln County is a county located in the U.S. state of Montana. As of the 2020 census, the population was 19,677. Its county seat is Libby. The county was founded in 1909 and named for President Abraham Lincoln. The county lies on Montana's ...
, , el.


Other waters west of the divide

* Deer Island,
Flathead County, Montana Flathead County is a County (United States), county located in the U.S. state of Montana. At the 2020 United States census, 2020 census, its population was 104,357, making it the state's fourth most populous county. Its county seat is Kalispell ...
, , el. in Echo Lake * Callows Island,
Lincoln County, Montana Lincoln County is a county located in the U.S. state of Montana. As of the 2020 census, the population was 19,677. Its county seat is Libby. The county was founded in 1909 and named for President Abraham Lincoln. The county lies on Montana's ...
, , el. in Bull Lake * Firemens Island,
Flathead County, Montana Flathead County is a County (United States), county located in the U.S. state of Montana. At the 2020 United States census, 2020 census, its population was 104,357, making it the state's fourth most populous county. Its county seat is Kalispell ...
, , el. in Echo Lake * Kelly Island,
Missoula County, Montana Missoula County is a County (United States), county located in the U.S. state, state of Montana. As of the 2020 United States census, 2020 census, the population was 117,922, making it Montana's List of counties in Montana, third most populous ...
, , el. in the
Clark Fork River The Clark Fork, or the Clark Fork of the Columbia River, is a river in the U.S. states of Montana and Idaho, approximately long. It is named after William Clark of the 1806 Lewis and Clark Expedition. The largest river by volume in Montana, it ...
* Pleasant Island,
Flathead County, Montana Flathead County is a County (United States), county located in the U.S. state of Montana. At the 2020 United States census, 2020 census, its population was 104,357, making it the state's fourth most populous county. Its county seat is Kalispell ...
, , el. in Foy Lake * Rock Island,
Sanders County, Montana Sanders County is a county in the U.S. state of Montana. As of the 2020 census, the population was 12,400. Its county seat is Thompson Falls. The county was founded in 1905. It has an annual county fair with rodeo at Plains. Geography Acco ...
, , el. in Noxon Reservoir * Scott Island,
Lincoln County, Montana Lincoln County is a county located in the U.S. state of Montana. As of the 2020 census, the population was 19,677. Its county seat is Libby. The county was founded in 1909 and named for President Abraham Lincoln. The county lies on Montana's ...
, , el. in the
Kootenai River The Kootenay River or Kootenai River is a major river of the Northwest Plateau in southeastern British Columbia, Canada, and northern Montana and Idaho in the United States. It is one of the uppermost major tributaries of the Columbia River, ...
* Sourdough Island,
Missoula County, Montana Missoula County is a County (United States), county located in the U.S. state, state of Montana. As of the 2020 United States census, 2020 census, the population was 117,922, making it Montana's List of counties in Montana, third most populous ...
, , el. in Salmon Lake (Montana) * Steamboat Island,
Sanders County, Montana Sanders County is a county in the U.S. state of Montana. As of the 2020 census, the population was 12,400. Its county seat is Thompson Falls. The county was founded in 1905. It has an annual county fair with rodeo at Plains. Geography Acco ...
, , el. in the
Clark Fork River The Clark Fork, or the Clark Fork of the Columbia River, is a river in the U.S. states of Montana and Idaho, approximately long. It is named after William Clark of the 1806 Lewis and Clark Expedition. The largest river by volume in Montana, it ...
* The Island,
Flathead County, Montana Flathead County is a County (United States), county located in the U.S. state of Montana. At the 2020 United States census, 2020 census, its population was 104,357, making it the state's fourth most populous county. Its county seat is Kalispell ...
, , el. in Whitefish Lake


Notes

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Islands This is a list of the lists of islands in the world grouped by country, by continent, by body of water, and by other classifications. For rank-order lists, see the #Other lists of islands, other lists of islands below. Lists of islands by count ...
Montana Montana ( ) is a landlocked U.S. state, state in the Mountain states, Mountain West subregion of the Western United States. It is bordered by Idaho to the west, North Dakota to the east, South Dakota to the southeast, Wyoming to the south, an ...