All - Architectural style - Greek Revival architecture
| Rocks Estate |
| Rockwell, Samuel, House |
| Rockwell Universalist Church |
| Rockwood |
| Rockwood |
| Rocky Mount Mills |
| Rocky Run Methodist Church |
| Rogers-Bagley-Daniels-Pegues House |
| Rogers, Col. Matthew, Building |
| Rogers-Drummond House |
| Rogers, Francis M., House |
| Rogers House |
| Rogers, Nathaniel, House |
| Rogers, Orson, House |
| Rogers, William A., House |
| Rogers, William, House |
| Rogues Harbor Inn |
| Rollins-Eyre House |
| Rombach Place |
| Root, William and Hannah, House |
| Root, William H., House |
| Roscoe Village |
| Rose Cliff |
| Rosedale |
| Rosedale |
| Rosedale Historic District |
| Rosedown Plantation |
| Rose Glen |
| Rose Hill |
| Rose Hill |
| Rose Hill |
| Rose Hill |
| Rose Hill Farm |
| Rose Hill Farm |
| Rose Hill Manor |
| Rosekrans, Enoch, House |
| Roseland |
| Roseland Plantation |
| Roselawn |
| Rose, Maj. A. J., House |
| Rosemary Hall |
| Rosemont |
| Rosemount |
| Roseneath |
| Ross, Harvey Lee, House |
| Rossiter, William, House |
| Ross, Moses, House |
| Rosswood |
| Rotch, William Jr., House |
| Rountree, J. H., Mansion |
| Routh-Bailey House |
| Routhland |
| Routzahn-Miller Farmstead |
| Rowe, Benjamin, House |
| Rowe House |
| Rowe House |
| Row House |
| Rowland, Alfred, House |
| Rowland, John A., House |
| Row, The |
| Royce, J. B., House and Farm Complex |
| Royston, Grandison D., House |
| Rucker, Benjamine, House |
| Rucker House |
| Rucker-Mason Farm |
| Ruckman, John, House |
| Ruffin, Edmund, Plantation |
| Ruffin-Roulhac House |
| Ruffner House |
| Ruggles, Charles, House |
| Ruggles, Draper, House |
| Rumford Point Congregational Church |
| Rumsey Farm |
| Rumsey Hall |
| Runyon House |
| Rural Point |
| Russell, Charles, House |
| Russell, Charles W., House |
| Russell, Edward Augustus, House |
| Russell, Philemon, House |
| Russell, Samuel Wadsworth, House |
| Russell, Susan, House |
| Ruter Hall |
| Ryon, Judge John, House |
| Sabine Pass Lighthouse |
| Saco City Hall |
| Saeger, Edward, House |
| Sail Loft |
| Sailors' Snug Harbor National Register District |
| Saint John's Methodist Episcopal Church |
| Saint John the Baptist Catholic Church |
| Saint Mark's Episcopal Church |
| Saint Peter the Apostle Church |
| Saints Peter and Paul Catholic Church |
| Saint Stephen's Episcopal Church |
| Salem Black River Presbyterian Church |
| Salem Crossroads Historic District |
| Salem Downtown Historic District |
| Salem Methodist Episcopal Church and Salem Walker Cemetery |
| Salem Presbyterian Church |
Data from United States Park Service and Wikidata
