All - Constructed - 1900–1909
| Queen Anne House |
| Quincy Shore Drive |
| Quinn Chapel African Methodist Episcopal Church and Parsonage |
| Quinn Ranger Station |
| Racine Depot |
| Racine Public Library |
| Railroad Depot Complex |
| Rainier Club |
| Ram Island Ledge Light Station |
| Rangley Public Library |
| Rankin County Confederate Monument |
| Ranshaw, Samuel and Emma A., House |
| Rapids Roadhouse |
| Ravennaside |
| Reading Railroad Station |
| Reber, Frederick, Jr., and Mary F., House |
| Record, Judson, House |
| Record Printing and Box Company Building |
| Reddick Hotel-Ophir LDS Meetinghouse |
| Redding House |
| Redding, William, House |
| Redd, Lemuel H., Jr., House |
| Redfield Carnegie Library |
| Redfield Light Plant and Fire Station |
| Red House |
| Reed Creek Mill |
| Reed-Wells House |
| Reese Creek School |
| Regez, Jacob, Sr., House |
| Renwick, Helen Goodwin, House |
| Revere Fire Hall |
| Revolution Cotton Mills |
| Rewerts, George, House |
| Reynolds House |
| Rhode Island Statehouse |
| Richards, Dexter, & Sons Woolen Mill |
| Richmond Tithing Office |
| Rich-Steeper House |
| Rickman Hotel |
| Ricks Memorial Library |
| Rifle Bridge |
| Riggs National Bank |
| Riley County Courthouse |
| Ringling, Charles, House |
| Rio Hondo Bridge |
| Ritch Hall |
| Riviere Building |
| Riviere House |
| Robbins, Royal E., School |
| Roberge-Desautels Apartment House |
| Robert, Sallie Chisum, House |
| Roberts, Col. William T., House |
| Roberts, Earl, House |
| Roberts Hall |
| Robertson Family Farm |
| Robinson, Byron W., House |
| Robinson-Smith House |
| Robinwood |
| Rockefeller Building |
| Rock Island Depot |
| Rockland Public Library |
| Rock of Ages Light Station |
| Rocky Ford Bridge |
| Rodef Shalom Temple |
| Roeser, Oscar, House |
| Roethke Houses |
| Rogers, James, House |
| Rogers, Newell, House |
| Rolfson House |
| Roosevelt, Sara Delano, Memorial House |
| Roos House |
| Rose Building |
| Rosecliff |
| Rosemary Hall |
| Rosenberg Library |
| Rosenstein Building |
| Rose, Rufus M., House |
| Ross, Dr. Robert M., House |
| Rossi, Mrs. A. F., House |
| Ross, Nimrod, House |
| Ross-Sewell House |
| Rotunda of the Pennsylvania Railroad Station |
| Round House |
| Royal Brewery |
| Royhl, Adam and Minnie, House |
| Roy, J. Arthur, House |
| Rozek, Theodore, House |
| Rozzell, Edward M., House |
| Ruhland, Charles and Anna |
| Rumford Falls Power Company Building |
| Rush Creek Bridge |
| Rutherford Hall |
| Rutherford House |
| Ruth, Thomas, H. House |
| Ryons-Alexander House |
| SABINO (steamer) |
| Saco Mercantile |
| Sacred Heart Church Historic District |
| Saint Camillus Academy |
| Saint James Court Apartments |
Data from United States Park Service and Wikidata
