Ohio - Area of significance: Exploration/Settlement
| Kimball, Solomon, House |
| Kinney, Aaron, House |
| Kirkwood, Joseph, House |
| Kunkle Log House |
| Ladd's Tavern |
| Lambert, Jeremiah, House and Barn |
| Laundon, Thomas W., House |
| Law, Henry, Farm Historic District |
| Leesville Town Hall |
| Linden Community and Recreation Center |
| Lock No. 26 |
| Lock No. 27 |
| Lock No. 28 |
| Lock No. 29 and Aqueduct |
| Lock No. 30 and Feeder Dam |
| Lock No. 31 |
| Lock No. 32 |
| Lock No. 33 |
| Lock No. 34 |
| Lock No. 35 |
| Lock No. 37 and Spillway |
| Lock No. 38 and Spillway |
| Lock No. 39 and Spillway |
| Lock Tender's House and Inn |
| Logan Historic District |
| Lyle, Samuel, Log House |
| Lytle Park Historic District |
| Macomb, Mary Worthington, House |
| March, George, House |
| Marmon, Martin, House |
| Martin, Joseph, House |
| Massillon Downtown Historic District |
| McCracken-McFarland House |
| McCracken-Scott House |
| McDonald Farm |
| Mentzer-Sorrick Farm |
| Miller-Knight House |
| Miller, Peter, House |
| Mill Office and Post Office |
| Mitchell, Charles, House |
| Mitchell, Randolph, House |
| Montgomery Saltbox Houses |
| Mound House |
| Nafzger-Miller House |
| Nicholson, James, House |
| Nurre-Royston House |
| Old Meigs County Courthouse And Chester Academy |
| Olin, Arvin, House |
| Omar Chapel |
| Overfield Tavern |
| Peairs Homestead |
| Pinney, Dr. Eli, House |
| Plymouth Historic District |
| Putnam Historic District |
| Rich, Charles B., House |
| Rider, Adam, House |
| Riley, Calvin E., House |
| Rinehart, Hugh T., House |
| Ripley Historic District |
| Roas-Ilhardt Farm and Winery |
| Rubicon Farm |
| Saint Anne's Hill Historic District |
| Salt House |
| Sarchet, Peter B., House |
| Sawyer-Curtis House |
| Schrock, Peter, Jr., Farm |
| Secor, Joseph K., House |
| Sells, Eliud, House |
| Serquet, Emanuel and Frederick, Farm |
| Seven Ranges Terminus |
| Shelby House |
| Shield's, Edwin M., House |
| Shull-Lugenbuhl Farm |
| Sprague, Jonathan, House |
| Springboro Historic District |
| Stanford, George, Farm |
| St. Clairsville Historic District |
| Stearns, Lyman, Farm |
| St. James Episcopal Church |
| Stone, Capt. Jonathan, House |
| St. Peter Evangelical Lutheran Church |
| St. Peter's Lick Run Historic District |
| Strong, John Stoughton, House |
| Studabaker-Scott House and Beehive School |
| Stumpy Basin |
| Talcott, Joseph, House |
| Tappan, Judge Abraham, House |
| Tinkers Creek Aqueduct |
| Travellers' Rest Inn |
| Treber Inn |
| Trop Farm |
| Umsted Farm |
| Unger, George B., House |
| Vaughn, Daniel, Homestead |
| Vistula Historic District |
| Voris, Peter Jr., House |
| Walker, William, Jr., House |
| Warszawa Neighborhood District |
| Waverly Canal Historic District |
| Waynesville Main Street Historic District |
Data from United States Park Service and Wikidata
