Adopt a County    all except             BIG HORN COUNTY  

Date Created

Parent County(s) From Which Organized

Beaverhead

2 Feb 1865

Original county

  Big    Horn   Adopted

13 Jan 1913

Rosebud Yellowstone

Blaine

29 Feb 1912

Chouteau

Broadwater

9 Feb 1897

Jefferson Meagher

Carbon

4 Mar 1895 Park

Yellowstone  Custer

Carter

22 Feb 1917

Custer

Cascade

12 Sep 1887

Chouteau  Meagher Lewis & Clark

Chouteau

2 Feb 1865

Original county

Custer

2 Feb 1865

Original county

Daniels

30 Aug 1920

Valley  Sheridan

Dawson

15 Jan 1869

Original county

Deer Lodge

2 Feb 1865

Original county

Edgerton

2 Feb 1865

Original county

Fallon

9 Dec 1913

 Custer

Fergus

12 Mar 1885

Meagher  Chouteau

Flathead

6 Feb 1893

Missoula

Gallatin

2 Feb 1865

Original county

Garfield

7 Feb 1919

Dawson

Glacier

17 Feb 1919

Teton

Golden Valley

4 Oct 1920

Musselshell Sweet Grass

Granite

2 Mar 1893

Deer Lodge

Hill

28 Feb 1912

Chouteau

Jefferson

2 Feb 1865

Original county

Judith Basin

10 Dec 1920

Fergus  Cascade

Lake

11 May 1923

Flathead  Missoula

Lewis & Clark

 2 Feb 1865

 Original county

Liberty

11 Feb 1920

Chouteau  Hill

Lincoln

9 Mar 1909

Flathead

Madison

2 Feb 1865

Original county

McCone

20 Feb 1919

Dawson  Richland

Meagher

16 Nov 1867

Original county

Mineral

7 Aug 1914

Missoula

Missoula

2 Feb 1865

Original county

Musselshell

11 Feb 1911

Fergus Yellowstone

Park

23 Feb 1887

Gallatin

Petroleum

24 Nov 1924

Fergus  Garfield

Phillips

5 Feb 1915

Valley

Pondera

17 Feb 1919

Chouteau Teton

Powder River

7 Mar 1919

Custer

Powell

31 Jan 1901

Missoula  Deer Lodge

Prairie

5 Feb 1915

Custer

Ravalli

16 Feb 1893

Missoula

Richland

27 May 1914

Dawson

Roosevelt

18 Feb 1919

Valley  Richland Sheridan

Rosebud

11 Feb 1901

Custer

Sanders

7 Feb 1905

Missoula

Sheridan

24 Mar 1913

Valley

Silver Bow

16 Feb 1881

Deer Lodge

Stillwater

24 Mar 1913

Sweet Grass Yellowstone Carbon

Sweet Grass

 5 Mar 1895

 Meagher Park  Yellowstone

Teton

7 Feb 1893

Chouteau

Toole

7 May 1914

Teton  Hill

Treasure

7 Feb 1919

Rosebud

Valley

6 Feb 1893

Dawson

Wheatland

22 Feb 1917

 Meagher Sweet Grass

Wibaux

17 Aug 1914

Dawson

Yellowstone

26 Feb 1883

 Gallatin  Meagher  Custer Carbon