Montana - Significance region: Local
| Gibson, A. J., House |
| Gibson, John, House |
| Gibson-Lebert House |
| Gifford House |
| Gildersleeve Mine |
| Gill, Sherman, House |
| Gilman State Bank |
| Gilpatrick-Root House |
| 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 |
| Glenn's Dam Historic District |
| 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 |
| Granite Apartments |
| Granite County Jail |
| Granite Park Chalet |
| Granke, Charles, House |
| Grant-Marshall Lime Kiln Historic District, The |
| Graves Hotel |
| Great Falls Central Business Historic District |
| Great Falls High School Historic District |
| Great Falls Northside Residential Historic District |
| Great Falls West Bank Historic District |
| Great Northern Railway Depot |
| Great Northern Railway Passenger and Freight Depot and Division Office |
| Greenblatt, Samuel, House |
| Green Ranch |
| Gregg-Moses House |
| Greve's Tourist Cabins |
| Griffen House |
| Hagadone, Frank, Homestead |
| Haight-Bridgwater House |
| Hale's Filling Station and Grocery |
| Halfway House |
| Hall Bungalow |
| Hamill Apartments |
| Hamill House |
| Hamilton Commercial Historic District |
| Hamilton Southside Residential Historic District |
| Hamilton Town Hall |
| Hammond Arcade |
| Harding Way Historic District |
| Hardy Bridge |
| Harmon, William, House |
| Harrington, Rose, House |
| Harris House |
| Harrison Lake Patrol Cabin |
| Harrison, Waborn (Wabe) and Sarah E., Ranch House |
| Harvat Ranch |
| Haverfield Hospital |
| Havre Residential Historic District |
| Hawthorne Grade School |
| Hayward Lodge |
| Headquarters Building and Daily Company Annex |
| Heatherington Boarding House |
| Hecla House |
| Helena Railroad Depot Historic District |
| Helena South-Central Historic District |
| Helena West Main Street Historic District |
| Heller Building |
| Hellgate Lodge 383 BPOE |
| Heltne Oil Company |
| Henneberry, William F., Homestead |
| Hepburn, John, Place |
| Heritage Museum, The |
| Herzog, J. M., House |
| Hi Bug Historic District |
| Hilger, Joe and Carrie, Ranch |
| Hines House |
| Hodgson House |
| Hoffman, Charles, House |
| Hogeland, Abraham and Mary Walton, House |
| Holy Rosary Church Rectory |
| Holy Rosary Hospital |
| Home of Peace |
| 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 |
Data from United States Park Service and Wikidata
