Ohio - Criteria: B (person)
| Promont |
| Prospect Place |
| Putman, Walter S., House |
| Putnam, Rufus, House |
| Raemelton Farm Historic District |
| Rankin, John, House |
| Ransbottom, Edward, House |
| Ransbottom, Mort, House |
| Rattermann, Heinrich A., House |
| Rawlings-Brownell House |
| Rawson House |
| Red Oak Presbyterian Church |
| Reed, C. A., House |
| Reed, Henry, Jr., House |
| Reeves, Jeremiah, House and Carriage House |
| Reid, Whitelaw, House |
| Renick House, Paint Hill |
| Renkert, Harry S., House |
| Rentschler House |
| Retszch, W. C., House |
| Reynolds, John R., House |
| Richards-Sewall House |
| Rickenbacker, Capt. Edward V., House |
| Riddle Block #11 |
| Riddle Block #5 |
| Riddle Block #9 |
| Riddle-Friend House |
| Rinehart, Hugh T., House |
| Rohr, David, Mansion And Carriage House |
| Rombach Place |
| Root, A. I. And E. R., Homestead |
| Root, William H., House |
| Ross-Gowdy House |
| Round Hill |
| Rubicon Farm |
| Salem Downtown Historic District |
| Salem Methodist Church Complex |
| Salt House |
| Sarchet, Peter B., House |
| Satterthwaite, John, House |
| Sawyer-Curtis House |
| Saxton House |
| Schantz, Adam Sr., House |
| Schmick, Charles Nelson, House |
| Schooley, Dr. Lindley, House and Office |
| Schuter Carpenter Shop and House |
| Schweinfurth, Charles, House |
| Seborn, Frederick Augustus, House |
| Sebring, Frank, House |
| Secor, Joseph K., House |
| Seiberling, Charles Willard, House |
| Sells, Benjamin, House |
| Sells, Eliud, House |
| Sells, William Henry, House |
| Seven Ranges Terminus |
| Shack, The |
| Shandy Hall |
| Sheridan House |
| Skywood Farms |
| Sloane, Rush R., House |
| Smead, David, House |
| Smith, Dr. Robert and Anne House |
| Smith, Samuel, House And Tannery |
| Snow, John, House |
| South Main Street District |
| Southworth House |
| Springdale |
| Spring Hill |
| Stan Hywet Hall-Frank A. Seiberling House |
| St. Clairsville Historic District |
| Stearns, Edward R., House |
| Stearns, William, House |
| St. Edward Hotel |
| Steubenville Pottery Company Buildings |
| Stockbridge Apartment Building |
| Stoll, Adam J., House |
| Stone, Capt. Jonathan, House |
| Stoneman, Joseph, House |
| Stowe, Harriet Beecher, House |
| Strong, John Stoughton, House |
| Studabaker-Scott House and Beehive School |
| Sullivant, Lucas, Building |
| Swetland House |
| Tallmadge-Mithoff House |
| Tangeman, John, House |
| Tannehill, Capt. James Boggs, House |
| Tappan, Judge Abraham, House |
| Taylor, Colonel Joseph, House |
| Temperance Row Historic District |
| The Ridge |
| Thompson, Cassius Clark, House |
| Thomson, Peter G., House |
| Thurber, James, House |
| Thurston Building |
| Townes, Clayton, House |
| Trailsend |
| Treber Inn |
| Trop Farm |
| Tuttle House |
| Twin Oaks |
Data from United States Park Service and Wikidata
