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Treaties
Louisiana Purchase

Counties per Cession
Cession
Cession 300
Counties
Dawson, Garfield, Prairie, Richland, McKenzie

Cession
Cession 373
Counties
Bonner, Boundary, Beaverhead, Deer Lodge, Flathead, Glacier, Granite, Jefferson, Lake, Lewis and Clark, Lincoln, Mineral, Missoula, Powell, Ravalli, Sanders, Silver Bow

Cession
Cession 374
Counties
Lake, Missoula, Sanders

Cession
Cession 398
Counties
Beaverhead, Broadwater, Deer Lodge, Gallatin, Jefferson, Lewis and Clark, Madison, Meagher, Park, Silver Bow, Park, Teton

Cession
Cession 399
Counties
Broadwater, Cascade, Chouteau, Fergus, Golden Valley, Judith Basin, Lewis and Clark, Meagher, Musselshell, Petroleum, Wheatland

Cession
Cession 517
Counties
Big Horn, Custer, Garfield, Golden Valley, Powder River, Prairie, Rosebud, Sweet Grass, Treasure, Yellowstone

Cession
Cession 529
Counties
Carter, Fallon, Powder River, Bowman, Grant, Mercer, Morton, Oliver, Slope, Stark, Campbell, Crook

Cession
Cession 532
Counties
Bonner, Boundary, Kootenai, Shoshone, Lincoln, Mineral, Sanders, Pend Oreille

Cession
Cession 557
Counties
Chouteau, Fergus, Judith Basin, Wheatland

Cession
Cession 565
Counties
Blaine, Chouteau, Daniels, Flathead, Glacier, Liberty, Phillips, Pondera, Roosevelt, Sheridan, Toole, Valley

Cession
Cession 574
Counties
Cascade, Chouteau, Flathead, Lewis and Clark, Liberty, Teton, Toole

Cession
Cession 585
Counties
Rosebud, Stillwater, Sweet Grass, Treasure, Yellowstone

Cession
Cession 597
Counties
Carter, Fallon, Powder River, Box Butte, Cherry, Dawes, Sheridan, Sioux, Butte, Custer, Fall River, Harding, Lawrence, Pennington, Campbell, Converse, Crook, Goshen, Johnson, Natrona

Cession
Cession 619
Counties
Carbon, Park, Stillwater, Sweet Grass

Cession
Cession 620
Counties
Carter, Custer, Dawson, Fallon, Powder River, Prairie, Richland, Wibaux, Billings, Dunn, Golden Valley, McKenzie, Mercer, Slope, Stark

Cession
Cession 622
Counties
Dawson, Garfield, McCone, Richland

Cession
Cession 623
Counties
Garfield, McCone, Richland, Roosevelt

Cession
Cession 635
Counties
Big Horn, Carbon, Stillwater, Sweet Grass, Treasure, Yellowstone

Cession
Cession 658a
Counties
Big Horn, Rosebud

Cession
Cession 692
Counties
Blaine, Chouteau, Daniels, Hill, Liberty, Phillips, Sheridan, Toole, Valley

Cession
Cession 693
Counties
Daniels, Roosevelt, Sheridan, Valley

Cession
Cession 694
Counties
Blaine, Phillips

Cession
Cession 695
Counties
Flathead, Glacier, Pondera

Cession
Cession 714
Counties
Carbon, Stillwater, Sweet Grass, Yellowstone

Cession
Cession 715
Counties
Big Horn, Carbon, Stillwater, Treasure, Yellowstone