Ohio - Area of significance: Industry
| Luethstrom-Hurin House |
| Lunkenheimer, Frederick, House |
| MacDonell House |
| Mackinaw Historic District |
| Madison Avenue Historic District |
| Main Street Historic District |
| Marietta Historic District |
| Marshall, James E., House |
| Mason, Frank H., House |
| McClelland, Harry S., House |
| McCormick Manufacturing Company Building |
| McDonald Farm |
| Meeker, Forrest, House and Farm |
| Merrill, Edwin H., House |
| Miami And Erie Canal, Deep Cut |
| Miller, Frederick A., House-Broad Gables |
| Mill Office and Post Office |
| Mill Worker House No. 1 |
| Mill Worker House No. 3 |
| Mill Worker House No. 4 |
| Mill Worker House No. 5 |
| Miner's Supply Store |
| Mohawk Place Historic District |
| Moore, Charles H., House |
| Morgan Mansion |
| Mount Pleasant Historic District |
| Mount Victory Historic District |
| Mueller Brewery |
| Mueller, Christ, House |
| Mueller Electric Company Building |
| Municipal Light Plant |
| Nela Park |
| Nelsonville Historic District |
| New Richmond Water Works and Electric Station |
| Norfolk and Western Freight Station |
| Normandy Farms |
| Northern Ohio Blanket Mills |
| North Union Shaker Site |
| Oberlin Gas Lighting Company Gasholder House |
| Oesterlein Machine Company-Fashion Frocks, Inc. Complex |
| Ohio and Erie Canal |
| Ohio Brass Company Office Building |
| Ohio Lantern Company |
| Ohio One-Ohio Edison |
| Ohio Valley Clay Company |
| Old Tippecanoe Main Street Historic District |
| Olive Furnace |
| Oregon Historic District |
| Orton Memorial Laboratory |
| Over-the-Rhine Historic District |
| Parker, John P., House |
| Parmelee House |
| Peerless Motor Company Plant No. 1 |
| Pennsylvania Railway Ore Dock |
| Perry, Norman Dewey, House |
| Petersburg Mill |
| Peters Cartridge Company |
| Picking, D., And Company |
| Pinecroft |
| Piqua-Caldwell Historic District |
| Pringle-Patric House |
| Putman, Walter S., House |
| Quaker Oats Cereal Factory |
| Rankin Historic District |
| Ransbottom, C. W., House |
| Ransbottom, Edward, House |
| Ransbottom, Frank M., House |
| Ransbottom, Mort, House |
| Rauch & Lang Carriage Company Building |
| Reeser, C. A., House |
| Reeves, Jeremiah, House and Carriage House |
| Renkert, Harry S., House |
| Rentschler House |
| Republic Iron and Steel Office Building |
| Retszch, W. C., House |
| Richman Brothers Company, The |
| Rich, N.J., and Co. Building |
| Riddle Block #11 |
| Riddle Block #5 |
| Riddle Block #9 |
| Riddle-Friend House |
| Riley, Calvin E., House |
| Riley Specialty Shoe Company |
| Ring, Walter, House and Mill Site |
| Rock Mill |
| Root, A. I. And E. R., Homestead |
| Rubicon Farm |
| Sachs and Pruden Ale Company Building |
| Saunders Seed Company |
| Schantz Organ Company |
| Schlee Brewery Historic District |
| Schmick, Charles Nelson, House |
| Schuter Carpenter Shop and House |
| Sebring, Frank, House |
| Seiberling, Charles Willard, House |
| Selby Shoe Company Building |
| Selle Gear Company |
| Shawnee Historic District |
| Shuey's Mill |
| Shuler & Benninghofen Woolen Mill |
Data from United States Park Service and Wikidata
