Montana - Role: Building
| Gebo, Henry, House |
| Gem Saloon |
| Geraldine Milwaukee Depot |
| Gibson, A. J., House |
| Gibson, John, House |
| Gibson-Lebert House |
| Gifford House |
| Gill, Sherman, House |
| Gilman State Bank |
| Gilpatrick-Root House |
| Gird Point Lookout |
| Glacier County Courthouse |
| Glacier Park Women's Club |
| Gladstone Hotel |
| Gleason Building |
| Gleim Building |
| Gleim Building II |
| Glendive City Water Filtration Plant |
| Glendive Heat, Light and Power Company Power Plant |
| Glidden House |
| Glidden Mercantile |
| Glover Cabin |
| Goathaunt Bunkhouse |
| Goff House |
| Gordon House |
| Grace Lutheran Church of Barber |
| Graf, Arnold, House |
| Graf Building |
| Graham House |
| Grandchamp House |
| Grandey Elementary School |
| Grand Hotel |
| Grand Pacific Hotel |
| Grand Union Hotel |
| Granite Apartments |
| Granite County Jail |
| Granite Park Chalet |
| Granke, Charles, House |
| Graves Hotel |
| Great Falls Central High School |
| Great Northern Railway Depot |
| Great Northern Railway Passenger and Freight Depot and Division Office |
| Greenblatt, Samuel, House |
| Green, Jesse R., Homestead |
| Green Ranch |
| Gregg-Moses House |
| Greve's Tourist Cabins |
| Griffen House |
| Gunsight Pass Shelter |
| Haight-Bridgwater House |
| Hale's Filling Station and Grocery |
| Halfway House |
| Hall Bungalow |
| Hamill Apartments |
| Hamill House |
| Hamilton Town Hall |
| Hammond Arcade |
| Harmon, William, House |
| Harrington, Rose, House |
| Harris House |
| Harrison Lake Patrol Cabin |
| Harrison, Waborn (Wabe) and Sarah E., Ranch House |
| Harvat Ranch |
| Hauser Mansion |
| Haverfield Hospital |
| Hawthorne Grade School |
| Hayward Lodge |
| Headquarters Building and Daily Company Annex |
| Hearst Free Library |
| Heatherington Boarding House |
| Heaven's Peak Fire Lookout |
| Hecla House |
| Heller Building |
| Hellgate Lodge 383 BPOE |
| Heltne Oil Company |
| Hepburn, John, Place |
| Heritage Museum, The |
| Herzog, J. M., House |
| Higgins Block |
| Hines House |
| Hodgson House |
| Hoffman, Charles, House |
| Hogeland, Abraham and Mary Walton, House |
| Holy Family Mission |
| Holy Rosary Church Rectory |
| Holy Rosary Hospital |
| Hornet Lookout |
| Hospital |
| Hotel Baxter |
| Hotel Metlen |
| Hotel Norden |
| Hough, Raymond, House |
| House at 112 Park Street |
| House at 22 West Lamme |
| House at 301 Eighth Avenue, South |
| House at 324 W. Corcoran |
| House at 618 West Janeaux |
| House at 714 North Tracy |
| House at 805 W. Watson |
| House at 809 W. Watson |
Data from United States Park Service and Wikidata
