Ohio - Area of significance: Social History
| 103rd Ohio Volunteer Infantry Association Barracks |
| Adams, John And Maria, House |
| Akron Jewish Center |
| Alcazar Hotel |
| Aldrich, Aaron, House |
| Alta Public Library |
| Ansel Road Apartment Buildings Historic District |
| Antioch Temple |
| Arlington Avenue District |
| Ashland County Children's Home |
| Ashtabula County Courthouse Group |
| Athens County Infirmary |
| Athens State Hospital |
| Athens State Hospital Cow Barn |
| Athletic Club of Columbus |
| Aurora Center Historic District |
| Austin, Eliphalet, House |
| Austintown Log House |
| Avon Isle |
| Barnhisel, Henry II, House |
| Bay View Hospital |
| Beatty-Moore House |
| Beecher, Lucas, House |
| Beir, Anna, House |
| Bellows Avenue School |
| Bellville Village Hall |
| Benedict, Reuben, House |
| Bimm Fireproof Warehouse |
| Blake, H. G., House |
| Blossom, Elizabeth B., Subdivision Historic District |
| Boeckling Building |
| Boeckling, G. A., House |
| Bohemian National Hall |
| Bolton, Chester and Frances, House |
| Brelsford-Seese House |
| Brown, Charles, Gothic Cottage |
| Brown, Jim, House |
| Brown, John, Farmhouse |
| Brown Township Building |
| Brown-Wing House |
| Brumback Library |
| Buckeye Commercial Historic District |
| Burlington 37 Cemetery |
| Burton Village Historic District |
| Bushnell, Martin, House |
| Butler, H. Karl, Memorial |
| Cable, Laurence House |
| Caledonia Public Square and North Water Street Historic District |
| Calvary Presbyterian Church |
| Camp Crowell Hilaka Historic District |
| Camp Manatoc Concord Lodge and Adirondacks Historic District |
| Camp Manatoc Dining Hall |
| Camp Manatoc Foresters Lodge and Kit Carson-Dan Boone Cabins Historic District |
| Camp Manatoc Legion Lodge |
| Camp Pittenger Historic District |
| Carnegie Library |
| Carnegie Library and Henry St. Clair Memorial Hall |
| Carroll Township Hall |
| Case-Barlow Farm |
| Castalia Trout Club |
| Cedar Branch Young Men’s Christian Association (YMCA) |
| Central Avenue Historic District |
| Central Branch, National Home for Disabled Volunteer Soldiers |
| Central Building of the Columbus Young Men's Christian Association |
| Central Ohio Lunatic Asylum |
| Chagrin Falls West Side District |
| Chandler, Matthew, House |
| Chapman-Hutchinson House |
| Chardon Courthouse Square District |
| Cheviot Fieldhouse |
| Childs, Alpha Charles, House |
| Christ Episcopal Church |
| Cincinnati Enquirer Building |
| Clemons, Alexander, House |
| Cleveland Home For Aged Colored People |
| Cleveland Masonic Temple |
| Coldwater Catholic Church Complex |
| Cole Avenue Housing Project Historic District |
| College of Wooster |
| Colony Burying Ground, Old |
| Columbia Baptist Cemetery |
| Columbiana County Infirmary |
| Columbian House |
| Columbia Town Hall |
| Columbus Gallery of Fine Arts |
| Columbus Near East Side District |
| Commodore Perry Hotel |
| Congregational Church Of Austinburg |
| Congregational Church of Christ |
| Convoy Opera House-City Hall-Firehouse Building |
| Cook, John, Farm |
| Cooley Farms |
| Crabill, David, House |
| Curtiss, Marcus, Inn |
| Cuvier Press Club |
| Danalds, Samuel, House |
| Datz, Walter, House |
| Davis, Alexander, House |
| Davis, Anson, House |
| Davis, Samuel Henry, House |
Data from United States Park Service and Wikidata
