New Hampshire - Area of significance: Architecture
| Sanbornton Square Historic District |
| Sanders, G. O., House |
| Sandown Depot, Boston and Maine Railroad |
| Sandown Old Meetinghouse |
| Sawyer Building |
| Sawyer-Medlicott House |
| Sawyer Tavern |
| Sawyer Woolen Mills |
| Scamman Farm |
| Scammon Farm Historic District |
| Scranton House |
| Searles School and Chapel |
| Seavey House |
| Second Free Baptist Church |
| Second Rindge Meetinghouse, Horsesheds and Cemetery |
| Sewall, Edward, Garrison |
| Shapley Town House |
| Shedd-Porter Memorial Library |
| Shepard Hill Historic District |
| Sherburne, Henry, House |
| Signer's House and Matthew Thornton Cemetery |
| Silver Lake District |
| Silver Lake Farm |
| Smith and Dow Block |
| Smith Chapel |
| Smith, Gov. John Butler, House |
| Smith-Mason Farm |
| Smith Meeting House |
| Smith's Corner Historic District |
| Smith, Simeon P., House |
| Smyth Public Library |
| Smyth Tower |
| Somoresworth High School |
| South Congregational Church |
| South Danbury Christian Church |
| South Meetinghouse |
| South Parish |
| South Sutton Meeting House |
| Sphinx Tomb |
| Springfield Town Hall and Howard Memorial Methodist Church |
| Spur House |
| Square Schoolhouse |
| St. Andrew's By-The-Sea |
| Stanley Tavern |
| St. Anne Church |
| Stark Covered Bridge |
| Stark, Gen. George, House |
| Stark Union Church |
| Stelljes House |
| Stevens Memorial Hall |
| St. George's School and Convent |
| St. John's Church |
| St. John's Church, Rectory, and Parish Hall |
| St. Mark's Episcopal Church |
| Stone-Darracott House |
| Stone Farm |
| Stonehenge |
| Stone School |
| Stonyfield Farm |
| Strafford County Farm |
| Strafford Union Academy |
| Strawbery Banke Historic District |
| Straw, William Parker, House |
| Strong, Capt. Richard, House |
| Strongman, Henry, House |
| Strongman, William, House |
| Strong, Richard, Cottage |
| St. Thomas Episcopal Church |
| Sullivan County Courthouse |
| Sullivan House |
| Sullivan, Roger, House |
| Suncook Village Commercial-Civic Historic District |
| Swallow Boathouse |
| Temple Town Hall |
| Tenney, Samuel, House |
| Thayer's Hotel |
| Third Fitzwilliam Meetinghouse |
| Thompson Hall |
| Tilton, Charles E., Mansion |
| Tilton Downtown Historic District |
| Tip-Top House |
| Todd Block |
| Town Center Historic District |
| Town Hall |
| Town Hall and Courthouse |
| Town House |
| Townsend Farm |
| Townsend, Jabez, House |
| Trinity Church |
| Trinity Church |
| Troy Village Historic District |
| Tucker Mountain Schoolhouse |
| Tuftonboro United Methodist Church |
| Tuttle, Donald D., House |
| Union Chapel |
| Union Meetinghouse-Universalist Church |
| Union Railroad Station and Freight Shed |
| Unitarian Church |
| United Baptist Church of Lakeport |
| United Church of Christ in Keene |
Data from United States Park Service and Wikidata
