Ohio - Area of significance: Commerce
| Acton House |
| Adams Bag Company Paper Mill and Sack Factory |
| Adams, G., House |
| Adams-Gray House |
| Akron Soap Company |
| Alliance Bank Building |
| Andrews, Ebenezer, House |
| ANTHONY WAYNE Shipwreck |
| Arcade Hotel |
| Arnold Wooden Ware Co.-Arnold Wholesale Corp. Building |
| Ashtabula Harbor Light |
| Ashtabula Harbour Commercial District |
| Ashtabula Main Avenue Historic District |
| Astrup Company Building, The |
| Athens Downtown Historic District |
| Atlas National Bank Building |
| Aurora Center Historic District |
| Aurora Train Station |
| Austin-Magie Farm and Mill District |
| Baker Brothers Wholesale Grocery |
| Baker, John, Tavern |
| Baker, Maj. John C., House |
| Baker Motor Vehicle Company Building |
| Baldwin Piano Company Building |
| Bank Block Building |
| Barber Shop |
| Barnesville Historic District |
| Barretts Mills |
| Barr Hotel |
| Beasley Building |
| Bedford Historic District |
| Bernhard, Frederick, House |
| Bingham Company Warehouse |
| Bissman Block |
| Boneyfiddle Commercial Disrict |
| Brick Tavern House |
| Brighton-Drydon Historic District |
| Broadway Historic District |
| Brooks, James, House |
| Brown, Jim, Tavern |
| Brown, Samuel N., House |
| Brumberg Building |
| Brunswick-Balke-Collender Building |
| Bryan Downtown Historic District |
| Bryant Building |
| Buckeye State Building and Loan Company Building |
| Bucyrus Commercial Historic District |
| Bunker Hill House |
| Burt Building |
| Burton Village Historic District |
| Bush Street Historic District |
| Butler, Cyrus, House |
| Buttles-Johnson House |
| Buxton Inn |
| Caldwell Downtown Historic District |
| Caledonia Public Square and North Water Street Historic District |
| Canal Fulton Historic District |
| Canal Warehouse |
| Cargo Warehouse |
| Carty, J.-R. J. Tussing House |
| Castle Block |
| Caxton Building |
| Centerville Historic District |
| Central Avenue Historic District |
| Central Tower Building |
| Cermak Building |
| Chagrin Falls Triangle Park Commercial District |
| Chardon Courthouse Square District |
| Cheese-vat Factory |
| Chillicothe Business District |
| City National Bank Building |
| City Savings Bank & Trust Company |
| Clement, George S., House |
| Cleveland Centre Historic District |
| Cleveland Discount Building |
| Cleveland Hotel, The |
| Cleveland Packard Building |
| Cleveland Warehouse District |
| Cleveland West Pierhead Light |
| Clossman Hardware Store |
| Columbus Avenue Historic District |
| Columbus Near East Side District |
| Commercial Street Historic District |
| Commodore Perry Hotel |
| Consolidated Fruit Auction Company Building |
| Cook Building |
| Cooke, Jay, House |
| Coshocton Main Street Historic District |
| Courthouse Center |
| Crafts William H., House |
| Crescent Hill |
| Crosley Building |
| Davis Mill |
| Day, Erastus, House |
| Dayton Arcade |
| Dayton Daily News Building |
| Dayton, James, House |
| Dayton, James, House, II |
| Dayton Power and Light Building Group |
| Dayton Stove and Cornice Works |
Data from United States Park Service and Wikidata
