| Agricultural Resources of the Cuyahoga Valley MPS (13) |
| Apartment Buildings in Ohio Urban Centers, 1870-1970 MPS (19) |
| Architecture of Guy Tilden in Canton, 1885-1905, TR (7) |
| Augspurger Amish/Mennonite Settlement TR (15) |
| Bath Township MRA (19) |
| Bell, C.S., TR (4) |
| Black History TR (6) |
| Boneyfiddle MRA (21) |
| Brooklyn Centre MRA (10) |
| Canal, Railroad, and Industrial Resources of the Village of Clinton/Warwick, Ohio MPS (10) |
| Canal Winchester MPS (23) |
| Central College MRA (4) |
| Chesterville MRA (9) |
| Columbia-Tusculum MRA (17) |
| Cross-Tipped Churches of Ohio TR (36) |
| Downtown Youngstown MRA (17) |
| East Broad Street MRA (24) |
| Eastlake Houses of Ashley TR (4) |
| East Liverpool Central Business District MRA (13) |
| East Toledo MPS (4) |
| Elyria MRA (27) |
| European Ethnic Communities, Dayton MPS (2) |
| Federal and State Correctional Institutions in Ohio MPS (4) |
| Fredericktown MRA (23) |
| Gates Mills MPS (1) |
| Granville MRA (7) |
| Hannaford, Samuel, & Sons TR (4) |
| Heidelberg College MRA (14) |
| Historic Bath Township, 1810-1959 MPS (3) |
| Historic Industrial Resources of Tipp City, Ohio 1840-1959 (2) |
| Historic Mill-Related Resources of Delaware and Liberty Townships MPS (9) |
| Historic Resources of the Cincinnati Park and Parkway System 1817-1959 (1) |
| Hobart Welded Steel Houses TR (8) |
| Hudson MPS (4) |
| Lebanon MRA (15) |
| Leesville Village MRA (4) |
| Light Stations of Ohio MPS (7) |
| Lima MRA (16) |
| Little Cities of Black Diamonds-Athens, Hocking, Perry Counties MPS (2) |
| Lower Prospect-Huron District MPS (6) |
| Madison MRA (31) |
| Mechanicsburg MRA (20) |
| Millersburg MRA (7) |
| Mingo Junction MRA (4) |
| Morgan's Raid in Kentucky, Indiana and Ohio MPS (1) |
| Ohio and Erie Canal TR (19) |
| Ohio Wesleyan University TR (8) |
| Park Avenue West MRA (32) |
| Pataskala MRA (11) |
| Patrol Stations in Cincinnati, Ohio TR (4) |
| Pennsylvania German Churches of Ohio MPS (3) |
| Ravenna Commercial Center MRA (5) |
| Recreation and Conservation Resources of the Cuyahoga Valley MPS (6) |
| Robinson-Ransbottom Pottery TR (5) |
| Round Barns in the Black Swamp of Northwest Ohio TR (5) |
| Sandusky MRA (90) |
| Seven Early Office Buildings at Central Square TR (7) |
| Short North MPS (3) |
| Tiffin Industrial Buildings TR (13) |
| Twentieth-Century African American Civil Rights Movement in Ohio MPS (12) |
| Upper Prospect MRA (22) |
| U.S. Coast Guard Lighthouses and Light Stations on the Great Lakes TR (5) |
| Vermilion-Harbour Town MRA (40) |
| Washington Township MRA (60) |
| Webster Station Area, Dayton, Ohio MPS (5) |
| Wellington-Huntington Road MRA (22) |
| Worthington MRA (26) |
| Wyoming MRA (18) |
| Zanesville Historic Railroad Depots TR (2) |
