Montana - Area of significance: Commerce
| Heller Building |
| Hellgate Lodge 383 BPOE |
| Heltne Oil Company |
| Higgins Block |
| Hotel Metlen |
| Hotel Norden |
| Hough, Raymond, House |
| Howe, John G., House |
| Independent Telephone Company Building |
| IOOF Hall and Fromberg Co-operative Mercantile Building |
| Izaak Walton Inn |
| Judith Landing Historic District |
| Kalispell Flour Mill |
| Kalispell Main Street Historic District |
| Kalispell Monumental Company |
| Kennedy Building |
| Ketterer, Emil, House |
| Kevin Depot |
| Kleinschmidt, T. H., House |
| Kootenai Lodge Historic District |
| Kose Hall |
| Krohne Spring House |
| Krug, Charles, House |
| Labor Temple |
| L and L Building |
| Laurel Downtown Historic District |
| Lavina State Bank |
| Lenox Flats |
| Lewistown Central Business Historic District |
| Lewistown Courthouse Historic District |
| Lewistown Merchantile Company |
| Lewistown Silk Stocking District |
| Lodge Grass Merchandise Company Store |
| Lohman Block |
| Lundwall, Charles, Building |
| Madison Hotel and Cafe |
| Main Street Historic District |
| Main Street Historic District |
| Manley’s General Store |
| Many Glacier Hotel Historic District |
| Margaret Block |
| Marsh and Powell Funeral Home |
| Masonic Building |
| Masonic Lodge |
| Matt's Place Drive-In |
| May, Albert, House |
| May, George, House |
| May, Harry, House |
| McCone Residence |
| McCormick Neighborhood Historic District |
| McCormick's Livery and Feed Stable Sign |
| Meadowbrook Stock Farm |
| Merrill Avenue Historic District |
| Miles City Steam Laundry |
| Milwaukee Depot |
| Missoula County Fairgrounds Historic District |
| Missoula Downtown Historic District |
| Missoula Mercantile |
| Missoula Mercantile Warehouse |
| Missoula Southside Historic District |
| Modern Hotel |
| Montana National Bank |
| Montgomery Ward |
| Mullan Road |
| Murphy, John T., House |
| North, Austin, House |
| Northern Hotel |
| Northern Pacific Railroad Depot |
| Northern Pacific-Story Mill Historic District |
| Northern Pacific Warehouse |
| Northside Missoula Railroad Historic District |
| Olive Hotel |
| Oliver Building |
| O'Neil Lumber Company Office |
| Parberry Block East |
| Pease's, George, Second Store |
| Philipsburg Historic District |
| Ping, J. J., House |
| Polson Feed Mill |
| Pony Historic District |
| Quinn's Garage |
| Rainbow Conoco |
| Raymond Grain Elevators Historic District |
| Red Lodge Brewing Company-Red Lodge Canning Company |
| Red Lodge Commercial Historic District |
| Regis Grocery |
| Robbers Roost |
| Roberts Building |
| Rocky Point |
| Rossiter, H. D., Building |
| Rundle Building |
| Ryan's, John, House |
| Sacajawea Hotel |
| Saco Mercantile |
| Sharp's, Jay, Store |
| Shaw’s Best Factory |
| Slayton Mercantile Co. |
| Smith Mine Historic District |
| Spieth and Krug Brewery |
| Stafford's Grocery |
Data from United States Park Service and Wikidata
