| Name | Town/City | Region | Type |
| American Computer Museum | Bozeman | South central | Computer |
| Bair Family Museum | Martinsdale | North central | Historic house |
| Beaverhead County Museum | Dillon | Southwest | Multiple |
| Big Horn County Historical Museum | Hardin | Southeast | Open air |
| Blaine County Museum | Chinook | Northeast | History |
| Broadwater County Museum | Townsend | Southwest | History |
| Canton Church Historic Site | Townsend | History | |
| Carbon County Historical Society Museum | Red Lodge | South central | History |
| Carter County Museum | Ekalaka | Multiple | |
| Castle Museum, Montana | White Sulphur Springs | North central | History |
| Central Montana Museum | Lewiston | North central | Multiple |
| Children's Museum of Bozeman | Bozeman | South central | Children's |
| Children's Museum of Northeast Montana | Glasgow | Northeast | Children's |
| C.M. Russell Museum | Great Falls | North central | Art |
| Conrad Mansion Museum | Kalispell | Northwest | Historic house |
| Conrad Transportation and Historical Museum | Conrad | North central | History / Transportation |
| Copper King Mansion | Butte | C | Historic house |
| Crazy Mountain Museum | Big Timber | South central | History |
| Culbertson Museum | Culbertson | Northeast | History |
| Custer Battlefield Museum | Garryowen | Southeast | History |
| Custer County Art & Heritage Center | City | Southeast | Art |
| Daly Mansion | Hamilton | Southwest | Historic house |
| Daniels County Museum & Pioneer Town | Scobey | Northeast | Living history |
| Darby Pioneer Memorial Museum | Darby | Northwest | History |
| Desert John's Saloon Museum | Deer Lodge | Southwest | History |
| Dumas Brothel | Butte | Southwest | History |
| Earth Science Museum | Loma | North central | History, Natural history |
| Families First Children's Museum | Missoula | Northwest | Children's |
| Fly Fishing Discovery Center | Livingston | Park | Sports - Fly fishing |
| Fort Benton Museums | Fort Benton | North central | Multiple |
| Fort Owen State Park | Stevensville | Southwest | Military |
| Fort Peck Interpretive Center & Museum | Fort Peck | Northeast | Natural history |
| Frontier Gateway Museum | Glendive | Southwest | History |
| Frontier Montana Museum | Deer Lodge | Southwest | History |
| Garfield County Museum | Jordan | History | |
| Gallatin County Historical Society & Pioneer Museum | Bozeman | South central | History |
| Glacier County Historical Society Museum | Cut Bank | Southwest | History |
| Granite County Museum & Cultural Center | Philipsburg | Southwest | History |
| Great Plains Dinosaur Museum and Field Station | Malta | Paleontology | |
| Grizzly & Wolf Discovery Center | West Yellowstone | South central | Natural history |
| H. Earl Clack Memorial Museum | Havre | North central | History |
| Heritage Museum, Libby | Libby | Northwest | History |
| Historic St. Mary's Mission | Stevensville | Southwest | History |
| Historical Museum at Fort Missoula | Missoula | Northwest | History |
| The History Museum | Great Falls | North central | History |
| Hockaday Museum of Art | Kalispell | Northwest | Art |
| Holt Heritage Museum | Lolo | Northwest | West |
| Holter Museum of Art | Helena | Southwest | Art |
| Huntley Project Museum of Irrigated Agriculture | Huntley | Southwest | Art |
| Jefferson Valley Museum | Whitehall | Southwest | History |
| Lewis and Clark Interpretive Center | Great Falls | North central | History |
| Liberty County Museum | Chester | North central | History |
| Livingston Depot Center | Livingston | South central | History |
| Mai Wah Museum | Butte | Southwest | Ethnic |
| Makoshika Dinosaur Museum | Glendive | Southwest | Paleontology |
| Makoshika State Park | Glendive | Southwest | Paleontology |
| Malmstrom Museum | Great Falls | North central | Aviation |
| Marcus Daly Historical Society | Anaconda | Southwest | Local history |
| Marias Museum of History and Art | Shelby | North central | History / Art |
| MBMG Mineral Museum | Butte | Southwest | Geology |
| Mehmke Museum | Great Falls | North central | Technology |