| Name | Image | County | Size | Estab- lished[1]
 | Lake / river | Remarks | 
  | acres | ha | 
  | Ackley Lake State Park |  | Judith Basin | 290 | 120 | 1940 | Ackley Lake |  | 
  | Anaconda Smelter Stack State Park |  | Deer Lodge | 12 | 4.9 | 1986 | none | The park cannot actually be accessed, but only viewed from a distance. | 
  | Bannack State Park |  | Beaverhead | 1,529 | 619 | 1954 | Grasshopper Creek | The well-preserved ghost town of a one-time territorial capital. | 
  | Beaverhead Rock State Park |  | Madison | 71 | 29 | 1975 | Beaverhead River |  | 
  | Beavertail Hill State Park |  | Missoula | 65 | 26 | 1968 | Clark Fork |  | 
  | Big Arm State Park |  | Lake | 217 | 88 | 1966 | Flathead Lake | Unit of Flathead Lake State Park | 
  | Black Sandy State Park |  | Lewis and Clark | 43 | 17 | 1980 | Hauser Reservoir |  | 
  | Brush Lake State Park |  | Sheridan | 450 | 180 | 2004 | Brush Lake | There are no fish in this lake due to the mineral makeup of the water. | 
  | Chief Plenty Coups State Park | .jpg) | Big Horn | 195 | 79 | 1961 | Pryor Creek |  | 
  | Clark's Lookout State Park |  | Beaverhead | 7 | 2.8 | 1985 | Beaverhead River |  | 
  | Cooney State Park |  | Carbon | 309 | 125 | 1970 | Cooney Reservoir |  | 
  | Council Grove State Park |  | Missoula | 187 | 76 | 1978 | Clark Fork River |  | 
  | Elkhorn State Park |  | Jefferson | 1 | 0.40 | 1980 | none |  | 
  | Finley Point State Park | .jpg) | Lake | 28 | 11 | 1965 | Flathead Lake | Unit of Flathead Lake State Park | 
  | First Peoples Buffalo Jump State Park |  | Cascade | 1,481 | 599 | 1972 | none | Formerly Ulm Pishkun State Park | 
  | Fish Creek State Park |  | Mineral | 6,200 | 2,500 | 2010 | Fish Creek |  | 
  | Fort Owen State Park | .jpg) | Ravalli | 2 | 0.81 | 1956 | Mill Creek |  | 
  | Frenchtown Pond State Park |  | Missoula | 41 | 17 | 1972 | Frenchtown Pond |  | 
  | Giant Springs State Park |  | Cascade | 675 | 273 | 1972 | Missouri River and Roe River |  | 
  | Granite Ghost Town State Park |  | Granite | 1 | 0.40 | 1975 | none | Abandoned 1890s silver boomtown. | 
  | Greycliff Prairie Dog Town State Park | .jpg) | Sweet Grass | 98 | 40 | 1974 | none |  | 
  | Hell Creek State Park |  | Garfield | 337 | 136 | 1966 | Fort Peck Lake |  | 
  | Lake Elmo State Park |  | Yellowstone | 183 | 74 | 1983 | Lake Elmo |  | 
  | Lake Mary Ronan State Park |  | Lake | 120 | 49 | 1967 | Flathead Lake |  | 
  | Les Mason State Park |  | Flathead | 8 | 3.2 | 1983 | Whitefish Lake |  | 
  | Lewis and Clark Caverns State Park |  | Jefferson | 2,920 | 1,180 | 1935 | none |  | 
  | Logan State Park |  | Lincoln | 18 | 7.3 | 1967 | Middle Thompson Lake |  | 
  | Lone Pine State Park |  | Flathead | 251 | 102 | 1941 | none |  | 
  | Lost Creek State Park |  | Deer Lodge | 502 | 203 | 1957 | Lost Creek |  | 
  | Milltown State Park |  | Missoula | 635 | 257 | 2012 | Clark Fork and Blackfoot rivers |  | 
  | Madison Buffalo Jump State Park |  | Gallatin | 638 | 258 | 1966 | none |  | 
  | Makoshika State Park |  | Dawson | 11,634 | 4,708 | 1953 | none |  | 
  | Marias River State Park |  | Toole | 2,011 | 814 | 2009[2] | Marias River |  | 
  | Medicine Rocks State Park |  | Carter | 330 | 130 | 1957 | none |  | 
  | Missouri Headwaters State Park |  | Gallatin | 532 | 215 | 1947 | Jefferson, Madison, and Gallatin rivers |  | 
  | North Shore State Park |  | Flathead | 160 | 65 | n/a | Flathead Lake |  | 
  | Painted Rocks State Park |  | Ravalli | 23 | 9.3 | 1963 | Painted Rocks Reservoir, Bitterroot River |  | 
  | Pictograph Cave State Park |  | Yellowstone | 93 | 38 | 1969 | none |  | 
  | Pirogue Island State Park |  | Custer | 210 | 85 | 1982 | Yellowstone River |  | 
  | Placid Lake State Park |  | Powell | 31 | 13 | 1977 | Placid Lake |  | 
  | Rosebud Battlefield State Park |  | Big Horn | 3,052 | 1,235 | 1978 | none |  | 
  | Salmon Lake State Park |  | Missoula | 42 | 17 | 1977 | Salmon Lake, Clearwater River |  | 
  | Sluice Boxes State Park |  | Cascade | 1,451 | 587 | 1974 | Belt Creek |  | 
  | Smith River State Park | .jpg) | Meagher | 1 | 0.40 | 1960 | Smith River | 59-mile (95 km) segment of the river with only one public put-in and one public take-out for the entire stretch. | 
  | Somers Beach State Park |  | Flathead | 106 | 43 | 2021 | Flathead Lake |  | 
  | Spring Meadow Lake State Park |  | Lewis and Clark | 61 | 25 | 1981 | Spring Meadow Lake |  | 
  | Thompson Falls State Park |  | Sanders | 36 | 15 | 1960 | Clark Fork, Noxon Rapids Reservoir |  | 
  | Tongue River Reservoir State Park |  | Big Horn | 642 | 260 | 1983 | Tongue River Reservoir |  | 
  | Tower Rock State Park |  | Cascade | 140 | 57 | 2004 | Near Missouri River |  | 
  | Travelers' Rest State Park |  | Missoula | 41 | 17 | 2001 | Lolo Creek |  | 
  | Wayfarers State Park |  | Lake | 67 | 27 | 1969 | Flathead Lake | Unit of Flathead Lake State Park | 
  | West Shore State Park |  | Lake | 129 | 52 | 1955 | Flathead Lake | Unit of Flathead Lake State Park | 
  | Whitefish Lake State Park |  | Flathead | 10 | 4.0 | 1960 | Whitefish Lake |  | 
  | Wild Horse Island State Park |  | Lake | 2,164 | 876 | 1977 | Flathead Lake | Unit of Flathead Lake State Park | 
  | Yellow Bay State Park |  | Lake | 15 | 6.1 | 1941 | Flathead Lake, Yellow Bay Creek | Unit of Flathead Lake State Park |