List of islands of Montana
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There are at least 115 named Islands in
Montana Montana () is a state in the Mountain West division of the Western United States. It is bordered by Idaho to the west, North Dakota and South Dakota to the east, Wyoming to the south, and the Canadian provinces of Alberta, British Columb ...
. These islands occur in
river A river is a natural flowing watercourse, usually freshwater, flowing towards an ocean, sea, lake or another river. In some cases, a river flows into the ground and becomes dry at the end of its course without reaching another body of w ...
s,
lake A lake is an area filled with water, localized in a basin, surrounded by land, and distinct from any river or other outlet that serves to feed or drain the lake. Lakes lie on land and are not part of the ocean, although, like the much large ...
s and
reservoirs A reservoir (; from French ''réservoir'' ) is an enlarged lake behind a dam. Such a dam may be either artificial, built to store fresh water or it may be a natural formation. Reservoirs can be created in a number of ways, including control ...
.


Islands east of the Continental Divide


Missouri River

* 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 count ...
, , 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 count ...
, , 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 count ...
, , 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 count ...
, , el. * Buckshot Island, Cascade County, Montana, , 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. The ...
, , 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 count ...
, , 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 of ...
, , 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 count ...
, , el. * Duck Island,
Valley County, Montana Valley County is a county in the U.S. state of Montana. Valley County was created in 1893 with area partitioned from Dawson County. As of the 2020 census, the population was 7,578. Its county seat is Glasgow. It is located on the Canada–Uni ...
, , 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 count ...
, , el. * Fisher Island, Cascade County, Montana, , el. * Grand Island,
Phillips County, Montana Phillips County is a county in the U.S. state of Montana. As of the 2020 census, the population was 4,217. Its county seat is Malta. Before February 5, 1915, Phillips County was part of Blaine County, and before 1912 both were part of Choutea ...
, , el. * Holmes Council Islands,
Fergus County, Montana Fergus County is a county in the U.S. state of Montana. As of the 2020 census, the population was 11,446. Its county seat is Lewistown. The county was founded in 1885 and named for James Fergus, a Montana politician who was instrumental in cr ...
, , el. * Iron City Islands,
Fergus County, Montana Fergus County is a county in the U.S. state of Montana. As of the 2020 census, the population was 11,446. Its county seat is Lewistown. The county was founded in 1885 and named for James Fergus, a Montana politician who was instrumental in cr ...
, , el. * Jones Island,
Phillips County, Montana Phillips County is a county in the U.S. state of Montana. As of the 2020 census, the population was 4,217. Its county seat is Malta. Before February 5, 1915, Phillips County was part of Blaine County, and before 1912 both were part of Choutea ...
, , el. * King Island,
Fergus County, Montana Fergus County is a county in the U.S. state of Montana. As of the 2020 census, the population was 11,446. Its county seat is Lewistown. The county was founded in 1885 and named for James Fergus, a Montana politician who was instrumental in cr ...
, , el. * Lower Two Calf Island,
Phillips County, Montana Phillips County is a county in the U.S. state of Montana. As of the 2020 census, the population was 4,217. Its county seat is Malta. Before February 5, 1915, Phillips County was part of Blaine County, and before 1912 both were part of Choutea ...
, , el. * Nelson Island, Cascade County, Montana, , el. * PN Island,
Fergus County, Montana Fergus County is a county in the U.S. state of Montana. As of the 2020 census, the population was 11,446. Its county seat is Lewistown. The county was founded in 1885 and named for James Fergus, a Montana politician who was instrumental in cr ...
, , el. * Park Island, Cascade County, Montana, , el. * Pine Island, Cascade County, Montana, , 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 count ...
, , 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 count ...
, , el. * Sacajawea Island, Cascade County, Montana, , el. * Scout Island,
Valley County, Montana Valley County is a county in the U.S. state of Montana. Valley County was created in 1893 with area partitioned from Dawson County. As of the 2020 census, the population was 7,578. Its county seat is Glasgow. It is located on the Canada–Uni ...
, , 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 count ...
, , 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. The ...
, , el. * Steamboat Island, Cascade County, Montana, , 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 of ...
, , el. * Taylor Island, Cascade County, Montana, , 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 count ...
, , el. * Upper Two Calf Island,
Phillips County, Montana Phillips County is a county in the U.S. state of Montana. As of the 2020 census, the population was 4,217. Its county seat is Malta. Before February 5, 1915, Phillips County was part of Blaine County, and before 1912 both were part of Choutea ...
, , 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. The ...
, , 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 count ...
, , 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 ma ...
, , 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 upper Missouri, via its own tributaries it drains an area with headwaters across the mountains a ...

* 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 propos ...
, , 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. Yellowstone County is named for the Yellowstone River which roughly bisects the 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 propos ...
, , 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 propos ...
, , 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. Yellowstone County is named for the Yellowstone River which roughly bisects the 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 Legi ...
, , 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 propos ...
, , 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 propos ...
, , 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 propos ...
, , 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. Yellowstone County is named for the Yellowstone River which roughly bisects the 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 propos ...
, , 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 propos ...
, , 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 propos ...
, , 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. Yellowstone County is named for the Yellowstone River which roughly bisects the 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 propos ...
, , 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 propos ...
, , el. * Howery Island,
Treasure County, Montana Treasure County is a county in the U.S. state of Montana. As of the 2020 census, the population was 762, making it the second-least populous county in Montana. Its county seat is Hysham. The county was founded in 1919. Geography According to ...
, , 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 15, ...
, , 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 Legis ...
, , 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 propos ...
, , 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 15, ...
, , el. * Pirogue Island,
Custer County, Montana Custer County is a county located in the U.S. state of Montana. As of the 2020 census, the population was 11,867. Its county seat is Miles City. The county was established on June 2, 1865 as one of the nine original counties of the Territory ...
, , 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. Yellowstone County is named for the Yellowstone River which roughly bisects the 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 15, ...
, , 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 propos ...
, , 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 Legis ...
, , 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 propos ...
, , 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. Yellowstone County is named for the Yellowstone River which roughly bisects the county ...
, , el. * Westover Island,
Carbon County, Montana Carbon County is a county located in the U.S. state of Montana. As of the 2020 census, the population was 10,473. Its county seat is Red Lodge. Carbon County is part of the Billings, MT Metropolitan Statistical Area. History Carbon County wa ...
, , 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 Mou ...
, , el. in the Big Horn River * 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 in the U.S. state of Montana. As of the 2020 census, the population was 4,217. Its county seat is Malta. Before February 5, 1915, Phillips County was part of Blaine County, and before 1912 both were part of Choutea ...
, , 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 The Beaverhead River is an approximately tributary of the Jefferson River in southwest Montana (east of the Continental Divide). It drains an area of roughly . The river's original headwaters, formed by the confluence of the Red Rock River and H ...
* Pelican Islands,
Phillips County, Montana Phillips County is a county in the U.S. state of Montana. As of the 2020 census, the population was 4,217. Its county seat is Malta. Before February 5, 1915, Phillips County was part of Blaine County, and before 1912 both were part of Choutea ...
, , 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 Beaverhead River is an approximately tributary of the Jefferson River in southwest Montana (east of the Continental Divide). It drains an area of roughly . The river's original headwaters, formed by the confluence of the Red Rock River and H ...
* The Island,
Carter County, Montana Carter County is a county located in the U.S. state of Montana. As of the 2020 census, the population was 1,415, making it the seventh-least populous county in Montana. The county seat is Ekalaka. History Carter County was named for Thomas ...
, , 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 o ...
, , el. in
Saint Mary Lake Saint Mary Lake is the second-largest lake in 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 elevation of , Saint Mary Lake's wate ...
* 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 o ...
, , el. in
Saint Mary Lake Saint Mary Lake is the second-largest lake in 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 elevation of , Saint Mary Lake's wate ...
* Woody Island,
Phillips County, Montana Phillips County is a county in the U.S. state of Montana. As of the 2020 census, the population was 4,217. Its county seat is Malta. Before February 5, 1915, Phillips County was part of Blaine County, and before 1912 both were part of Choutea ...
, , 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 doze ...
, , el. in
Fort Peck Lake Fort Peck Lake, or Lake Fort Peck, is a major reservoir in Montana, formed by the Fort Peck Dam on the Missouri River. The lake lies in the eastern prairie region of Montana approximately east of Great Falls and north of Billings, reaching in ...


Islands west of the Continental Divide


Flathead Lake

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


Hungry Horse Reservoir

* Clayton Island,
Flathead County, Montana Flathead County is in the U.S. state of Montana. At the 2020 census, its population was 104,357, making it the state's fourth most populous county. Its county seat is Kalispell. Its numerical designation (used in the issuance of license plates ...
, , el. * Elk Island,
Flathead County, Montana Flathead County is in the U.S. state of Montana. At the 2020 census, its population was 104,357, making it the state's fourth most populous county. Its county seat is Kalispell. Its numerical designation (used in the issuance of license plates ...
, , el. * Fire Island,
Flathead County, Montana Flathead County is in the U.S. state of Montana. At the 2020 census, its population was 104,357, making it the state's fourth most populous county. Its county seat is Kalispell. Its numerical designation (used in the issuance of license plates ...
, , el. * Kelly Island,
Flathead County, Montana Flathead County is in the U.S. state of Montana. At the 2020 census, its population was 104,357, making it the state's fourth most populous county. Its county seat is Kalispell. Its numerical designation (used in the issuance of license plates ...
, , el. * Lost Island,
Flathead County, Montana Flathead County is in the U.S. state of Montana. At the 2020 census, its population was 104,357, making it the state's fourth most populous county. Its county seat is Kalispell. Its numerical designation (used in the issuance of license plates ...
, , 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 la ...

* 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 in the U.S. state of Montana. At the 2020 census, its population was 104,357, making it the state's fourth most populous county. Its county seat is Kalispell. Its numerical designation (used in the issuance of license plates ...
, , 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 in the U.S. state of Montana. At the 2020 census, its population was 104,357, making it the state's fourth most populous county. Its county seat is Kalispell. Its numerical designation (used in the issuance of license plates ...
, , el. in Echo Lake * Kelly Island,
Missoula County, Montana Missoula County is located in the State of Montana. As of the 2020 census, the population was 117,922, making it Montana's third-most populous county. Its county seat and largest city is Missoula. The county was founded in 1860. Missoula Cou ...
, , el. in the Clark Fork River * Pleasant Island,
Flathead County, Montana Flathead County is in the U.S. state of Montana. At the 2020 census, its population was 104,357, making it the state's fourth most populous county. Its county seat is Kalispell. Its numerical designation (used in the issuance of license plates ...
, , 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 Acc ...
, , 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 * Sourdough Island,
Missoula County, Montana Missoula County is located in the State of Montana. As of the 2020 census, the population was 117,922, making it Montana's third-most populous county. Its county seat and largest city is Missoula. The county was founded in 1860. Missoula Cou ...
, , 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 Acc ...
, , el. in the Clark Fork River * The Island,
Flathead County, Montana Flathead County is in the U.S. state of Montana. At the 2020 census, its population was 104,357, making it the state's fourth most populous county. Its county seat is Kalispell. Its numerical designation (used in the issuance of license plates ...
, , el. in Whitefish Lake


Notes

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Islands An island (or isle) is an isolated piece of habitat that is surrounded by a dramatically different habitat, such as water. Very small islands such as emergent land features on atolls can be called islets, skerries, cays or keys. An island ...
Montana Montana () is a state in the Mountain West division of the Western United States. It is bordered by Idaho to the west, North Dakota and South Dakota to the east, Wyoming to the south, and the Canadian provinces of Alberta, British Columb ...