Ohio - Role: District
| Albert Krumm Apartments Historic District |
| Alliance Clay Product Company |
| Ambler Heights Historic District |
| Anderson Ferry |
| Anna-Dean Farm |
| Ansel Road Apartment Buildings Historic District |
| Archwood Avenue Historic District |
| Arlington Avenue District |
| Ashland County Children's Home |
| Ashtabula County Courthouse Group |
| Ashtabula Harbour Commercial District |
| Ashtabula Main Avenue Historic District |
| Athens County Infirmary |
| Athens Downtown Historic District |
| Athens State Hospital |
| Ault-Weygandt Farm |
| Aurora Center Historic District |
| Austin-Magie Farm and Mill District |
| Baldwin-Wallace College North Campus Historic District |
| Baldwin-Wallace College South Campus Historic District |
| Barberton Downtown Historic District |
| Barnesville Historic District |
| Barretts Mills |
| Beam Farm Woodland Archeological District |
| Bedford Historic District |
| Bell, Hiram, Farmstead |
| Belmont Historic District |
| Berkshire Park Historic District |
| Betts-Longworth Historic District |
| B.F. Goodrich Company Historic District |
| Birckhead Place Historic District |
| Birdtown Historic District |
| Birmingham Historic District |
| Bixler, George, Farm |
| Blossom, Elizabeth B., Subdivision Historic District |
| Boneyfiddle Commercial Disrict |
| Boom Town Historic District |
| Boston Mills Historic District |
| Botzum Farm |
| Brick Quarters Historic District |
| Brighton-Drydon Historic District |
| Broadway Avenue Historic District |
| Broadway Historic District |
| Bronson Place |
| Brookfield Center Historic District |
| Brooklyn Centre Historic District |
| Brown-Gorman Farm |
| Brownhelm Historic District |
| Bryan Downtown Historic District |
| Buckeye Commercial Historic District |
| Buckeye Furnace |
| Bucyrus Commercial Historic District |
| Burton Village Historic District |
| Bushnell-Foos Historic District |
| Bush Street Historic District |
| Cable Park Historic District |
| Caldwell Downtown Historic District |
| Caledonia Public Square and North Water Street Historic District |
| Camp Crowell Hilaka Historic District |
| Camp Manatoc Foresters Lodge and Kit Carson-Dan Boone Cabins Historic District |
| Camp Pittenger Historic District |
| Canal Fulton Historic District |
| Capital University Historic District |
| Carroll, John, University North Quad Historic District |
| Cascade Locks Historic District |
| Castalia Trout Club |
| Celina Main Street Commercial Historic District |
| Center Street Historic District |
| Centerville Historic District |
| Central Avenue Historic District |
| Central Avenue Historic District |
| Central Branch, National Home for Disabled Volunteer Soldiers |
| Chagrin Falls East Side Historic District |
| Chagrin Falls Triangle Park Commercial District |
| Chagrin Falls West Side District |
| Champion Coated Paper Company |
| Chardon Courthouse Square District |
| Cheviot Fieldhouse |
| Chillicothe Business District |
| Chillicothe's Old Residential District |
| Chillicothe Veterans Administration Hospital |
| Cincinnati East Manufacturing and Warehouse District |
| Cincinnati Street Gas Lamps |
| Circleville Historic District |
| Cisler Terrace |
| Cleveland Centre Historic District |
| Cleveland Mall |
| Cleveland Public Square |
| Cleveland Warehouse District |
| Clifton Avenue Historic District |
| Clifton Park Lakefront District |
| Clifton Park South Historic District |
| Clinton Ohio and Erie Canal Historic District-Clinton Lock 2 and 3-Clinton Upper (Lock 2) and Clinton Lower (Lock 3) |
| Clough Creek and Sand Ridge Archeological District |
| Coal Run Historic District |
| Cole Avenue Housing Project Historic District |
| Colerain Works Archeological District |
| College Hill Historic District |
| College of Wooster |
| Colony Burying Ground, Old |
Data from United States Park Service and Wikidata
