Indiana - Area of significance: Commerce
| Lockyear College |
| Lodge |
| Lombard Building |
| Lowell Commercial Historic District |
| Lusk Home and Mill Site |
| Madison Historic District |
| Majestic Building |
| Makepeace, George, House |
| Mansfield Roller Mill |
| Mansion Row Historic District |
| Marion Downtown Commercial Historic District |
| Marion Firestone Auto Supply & Service Center |
| Marott Hotel |
| Marott's Shoes Building |
| Martens |
| Martinsville Commercial Historic District |
| Massachusetts |
| Massachusetts Avenue Commercial District |
| MATERIAL SERVICE (shipwreck) |
| Matthews Stone Company Historic District |
| Mayleeno |
| McCormick, Charles, Building |
| McCurdy Building (Sears, Roebuck and Company Building) |
| McCurdy Hotel |
| McEwen-Samuels-Marr House |
| McKay |
| Mead Johnson River-Rail-Truck Terminal and Warehouse |
| Merchants National Bank and Annex |
| Michigan Road Toll House |
| Middletown Commercial Historic District |
| Mitchell Downtown Historic District |
| Monon Commercial Historic District |
| Montgomery Ward Building |
| Mooresville Commercial Historic District |
| Morgantown Historic District |
| Morrison Block (M. O'Connor Grocery Wholesalers) |
| Mount Vernon Downtown Historic District |
| MUSKEGON Shipwreck Site |
| Myrtle Fern |
| Nashville Historic District |
| National City Bank |
| Nester House |
| New Albany Downtown Historic District |
| Newby, Micah, House |
| New Carlisle Historic District |
| New Castle Commercial Historic District |
| Newman, M. G., Building |
| Ninde-Mead-Farnsworth House |
| Noblesville Commercial Historic District |
| Northern States Life Insurance Company |
| North Liberty Commercial Historic District |
| North Manchester Historic District |
| North Vernon Downtown Historic District |
| Old Bittermann Building |
| Oldenburg Historic District |
| Olde Store (John O'Ferrell Store) |
| Old Fellwock Auto Company |
| Old Hoosier Theatre |
| Old Jeffersonville Historic District |
| Old Northside Historic District |
| Old Richmond Historic District |
| Old State Bank |
| Oliver, Joseph D., House |
| Original Newburgh Historic District |
| Orleans Historic District |
| Oxford |
| Palace Lodge |
| Palais Royale Building |
| Paoli Historic District |
| Parson and Scoville Building |
| Pearl Steam Laundry |
| Pendleton Historic District |
| Pennsylvania |
| Peru Courthouse Square Historic District |
| Pierceton Historic District |
| Plaza |
| Plymouth Downtown Historic District |
| Point Historic District |
| Portland Commercial Historic District |
| Pound, John, Store |
| Princeton Courthouse Square Historic District |
| Purviance, Samuel, House |
| Randall Building |
| Redkey Historic District |
| Rensselaer Courthouse Square Historic District |
| Reserve Loan Life Insurance Company |
| Richmond Downtown Historic District |
| Richmond Railroad Station Historic District |
| Ridgway Building |
| Rink |
| Rink's Womens Apparel Store |
| Rising Sun Historic District |
| Roachdale Historic District |
| Roads Hotel |
| Roberts Hotel |
| Rochester Downtown Historic District |
| Rockport Historic District |
| Rockville Historic District |
| Roots, Francis T., Building |
| Rushville Commercial Historic District |
Data from United States Park Service and Wikidata
