Beaverhead Formed: 1865 Parent: Original		Big Horn Formed: 1913 Parent: Rosebud /Yellowstone		Blaine Formed: 1912 Parent: Choteau		Broadwater Formed: 1895 Parent: Jefferson/Meagher		Carbon Formed: 1895 Parent: Park/Yellowstone
Carter Formed: 1917 Parent: Fallon		Cascade Formed: 1887 Parent: Chouteau/Meagher		Chouteau Formed: 1865 Parent: Original		Custer Formed: 1877 Parent: Bighorn		Daniels Formed: 1920 Parent: Sheridan/Valley
Dawson Formed: 1869 Parent: Original		Deer Lodge Formed: 1865 Parent: Original		Fallon Formed: 1913 Parent: Custer		Fergus Formed: 1886 Parent: Original		Flathead Formed: 1893 Parent: Missoula
Gallatin Formed: 1865 Parent: Original		Garfield Formed: 1919 Parent: Dawson		Glacier Formed: 1919 Parent: Teton		Golden Valley Formed: 1920 Parent: Musselshell/Sweetgrass		Granite Formed: 1893 Parent: Deer Lodge/Missoula
Hill Formed: 1912 Parent: Choteau		Jefferson Formed: 1865 Parent: Original		Judith Basin Formed: 1920 Parent: Cascade/Fergus		Lake Formed: 1923 Parent: Flathead//Missoula		Lewis and Clark Formed: 1865 Parent: Original
Liberty Formed: 1920 Parent: Choteau/Hill		Lincoln Formed: 1909 Parent: Flathead		Madison Formed: 1865 Parent: Original		McCone Formed: 1919 Parent: Dawson/Richland		Meagher Formed: 1867 Parent: Choteau/Gallatin
Mineral Formed: 1914 Parent: Missoula		Missoula Formed: 1865 Parent: Original		Musselshell Formed: 1911 Parent: Fergus/Meagher/Yellowstone		Park Formed: 1887 Parent: Gallatin		Petroleum Formed: 1925 Parent: Fergus
Phillips Formed: 1915 Parent: Blaine/Valley		Pondera Formed: 1919 Parent: Choteau/Teton		Powder River Formed: 1919 Parent: Custer		Powell Formed: 1901 Parent: Deer Lodge		Prairie Formed: 1915 Parent: Dawson/Fallon
Ravalli Formed: 1893 Parent: Missoula		Richland Formed: 1914 Parent: Dawson		Roosevelt Formed: 1919 Parent: Sheridan		Rosebud Formed: 1901 Parent: Custer		Sanders Formed: 1905 Parent: Missoula
Sheridan Formed: 1913 Parent: Valley		Silver Bow Formed: 1881 Parent: Deer Lodge		Stillwater Formed: 1913 Parent: Carbon/Sweetgrass/Yellowstone		Sweet Grass Formed: 1895 Parent: Meagher/Park/Yellowstone		Teton Formed: 1893 Parent: Choteau
Toole Formed: 1914 Parent: Hill/Teton		Treasure Formed: 1919 Parent: Rosebud		Valley Formed: 1893 Parent: Dawson		Wheatland Formed: 1917 Parent: Meagher/Sweetgrass		Wibaux Formed: 1914 Parent: Dawson/Fallon/Richland