Connecticut - Role: Building
| Ramsdell, Hezekiah S., Farm Site |
| Randall, John, House |
| Raymond-Bradford Homestead |
| Raynham |
| Rectory and Church of the Immaculate Conception |
| Red Mountain Shelter |
| Reeve, Tapping, House and Law School |
| Remington, Frederic, House |
| Restmore |
| Richardson, Nathaniel, House |
| Rider, John, House |
| Ridgebury Congregational Church |
| Rising Sun Tavern |
| Robbins, John, House |
| Robbins, Unni II, House |
| Robinson, P., Fur Cutting Company |
| Rock Hall |
| Rock Ledge |
| Rockwell House |
| Rockwell, Solomon, House |
| Rocky Hill Congregational Church |
| Rocky Neck Pavilion |
| Rogers, John, House |
| Rogers, John, Studio |
| Root, Jonathan, House |
| Rosemary Hall |
| Rowe and Weed Houses |
| Royal Typewriter Company Building |
| Rumsey Hall |
| Russell Company Upper Mill |
| Russell, Edward Augustus, House |
| Russell, Samuel Wadsworth, House |
| Sabbathday House |
| Sage-Kirby House |
| Saint Anthony Hall |
| Saint Luke's Home for Destitute and Aged Women |
| Salem School |
| Sanford-Curtis-Thurber House |
| Sanford, Frederick S., House |
| Sanford-Humphreys House |
| Sanseer Mill |
| Saxony Mill |
| Schlaraffia Burg |
| Schoverling, Carl F., Tobacco Warehouse |
| Scoville Memorial Library |
| Scoville Powerhouse |
| Seaside Institute |
| Second Church of Christ |
| Sedgwick, Maj. Gen. John, House |
| Seelye, Seth, House |
| Selleck, Sylvanus, Gristmill |
| Seventh Sister |
| Seymour, Elisha, Jr., House |
| Seymour High School and Annex |
| Shade Swamp Shelter |
| Shambaugh House |
| Shaw Mansion |
| Shelley House |
| Shelton, William, House |
| Shepard, John, House |
| Shepherd of the Sea Chapel |
| Sherman, David, House |
| Shore Line Electric Railway Powerhouse |
| Simpson, Dr. Frank T., House |
| Simpson, Samuel, House |
| Simsbury Bank and Trust Company Building |
| Simsbury Railroad Depot |
| Simsbury Townhouse |
| Skee's Diner |
| Skelton, Dr. Henry, House |
| Skinner, Jason, House |
| Slater Library and Fanning Annex |
| Sleeping Giant Tower |
| Sloan-Raymond-Fitch House |
| Sloper-Wesoly House |
| Smith, H. D., Company Building |
| Smith, Jabez, House |
| Smith, Samuel, House |
| Smith, Shubel, House |
| Sound Beach Railroad Station |
| South Canaan Congregational Church |
| South Congregational Church |
| Southern New England Telephone Company Adminstrative Building |
| Southern New England Telephone Company Building |
| Southington Public Library |
| Southport Railroad Stations |
| South School |
| Southwest District School |
| Southwest District School |
| Spanish House, The |
| Spencer House |
| Sports Building |
| Sprague, Elias, House |
| Stackpole, Moore, and Tryon Building |
| Stamford Harbor Lighthouse |
| St. Andrew's Episcopal Church |
| St. Andrew's Protestant Episcopal Church |
| Stanley-Whitman House |
| Stanley-Woodruff-Allen House |
| Stanton, Robert, House |
Data from United States Park Service and Wikidata
