Montana - Area of significance: Agriculture
| Adam's, J. C., Stone Barn |
| Bass Mansion |
| Beavertown Historic District |
| Bielenberg, Nick J., House |
| Bighorn Ditch Headgate |
| Billy Miles & Bros. Grain Elevator |
| B-K Ranch |
| Bones Brothers Ranch |
| Bottler, Frederick and Josephine, House |
| Bruyer Granary |
| Buttelman Ranch |
| Camp Four |
| Cedarvale |
| Cheever-Cain Ranch |
| Chicken Creek Farmstead Historic District |
| Child, W. C., Ranch |
| Cold Springs Ranch House |
| Cook Farm |
| Crail Ranch Buildings |
| Crocker-Jarvi Homestead |
| Cross Ranch Headquarters |
| Doncaster Round Barn |
| Draft Horse Barn, Fergus County Fairgrounds |
| Eagle Guard Station |
| Ebert Ranch |
| Ervin Homestead-Gist Bottom Historic District |
| Ewing-Snell Ranch |
| Ferris-Hermsmeyer-Fenton |
| Fitzpatrick Ranch Historic District |
| Fortin Ranch House |
| Fort Keogh |
| Gallatin Valley Seed Company |
| Gebo Barn |
| Gehring Ranch |
| Grant-Kohrs Ranch National Historic Site |
| Grant-Kohrs Ranch/Warren Ranch |
| Green, Jesse R., Homestead |
| Green Ranch |
| Hagadone, Frank, Homestead |
| Harrison, Waborn (Wabe) and Sarah E., Ranch House |
| Harvat Ranch |
| Heikkila-Mattila Homestead |
| Henneberry, William F., Homestead |
| Hilger, Joe and Carrie, Ranch |
| Judith Landing Historic District |
| Judith River Ranger Station |
| Kent Dairy Round Barn |
| Kero Farmstead Historic District |
| Kraftenberg Homestead |
| Krug, Charles, House |
| LaPierre Barn |
| Larsen, Aage and Kristine, Homestead |
| Laurel Downtown Historic District |
| Lee Homestead |
| Lewis-Nevala Homestead |
| Lewistown Central Business Historic District |
| Lewistown Courthouse Historic District |
| Lewistown Silk Stocking District |
| Lower Willow Creek Rural Historic Landscape District |
| McCarthy-Pederson Farm Historic District |
| McMaster Ranch Historic District |
| Meadowbrook Stock Farm |
| MISCO Grain Elevator |
| Montana State University Historic District |
| Naylor Brothers Ranch Historic District |
| N-Bar Ranch |
| Nelson, Gus, Homestead |
| O'Donnell, I. D., House |
| OTO Homestead and Dude Ranch |
| OW Ranch |
| Raymond Grain Elevators Historic District |
| River View Dairy Barn |
| Silver King Ranch |
| Sims-Garfield Ranch |
| Sixty-Three Ranch |
| Spannring, John Otto, Family Farm |
| Stone Homestead |
| Summers-Quast Farmstead |
| Swanson Homestead |
| Torgrimson Place |
| Trowbridge Dairy |
| University Heights Historic District |
| Vananda Historic District |
| Van Camp-Tash Ranch |
| Vaughn, Robert, Homestead |
| Vogt-Nunberg Farm |
| Wargelin-Warila Homestead |
| Watkins Creek Ranch |
| Wetzstein/Tipton Ranch |
| Whaley Homestead |
| Wibaux, Pierre, House |
| Wood Lawn Farm |
Data from United States Park Service and Wikidata
