Maine - Role: Building
| Scribner Homestead |
| Seal Harbor Congregational Church |
| Seaverns, George, House |
| Seavey, A. B., House |
| Seavey-Robinson House |
| Second Callahan Block |
| Second Congregational Church |
| Security Trust Building |
| Sedgley, John, Homestead |
| Seguin Island Light Station |
| Sellers, Salome, House |
| Seton, Elizabeth Ann, Hospital |
| Seven Star Grange, No. 73 |
| Sewall, William, House |
| Sewell Memorial Congregational Church |
| Shaw, William M., House |
| Shiloh Temple |
| Shore Acres |
| Singhi Double House |
| Skelton, Thomas, House |
| Skowhegan Fire Station |
| Skowhegan Free Public Library |
| Slate House |
| Small Point Club |
| Smith-Emery House |
| Smith, George W., Homestead |
| Smith, James, Homestead |
| Smith, Parson, House |
| Smith, Zebulon, House |
| Snipe Farm |
| Soderholtz, Eric E., Cottage |
| Soldiers Memorial Library |
| Somerset Academy |
| Somerset County Courthouse |
| Sorrento Library |
| Sound Schoolhouse |
| Southard Block |
| South Bridgton Congregational Church |
| South China Meeting House |
| Southgate Farm |
| South Parish Congregational Church and Parish House |
| South Solon Meetinghouse |
| Sparrow House |
| Spaulding House |
| Spite House |
| Springfield Congregational Church |
| Sproul Homestead |
| Sproul's Cafe |
| Sprucewold Lodge |
| Spurwink Congregational Church |
| Squire Tarbox House |
| St. Andrew's Church |
| St. Anne's Church and Mission Site |
| St. Anne's Episcopal Church |
| Stanwood Homestead |
| Staples Inn |
| Star of Hope Lodge |
| St. Cyril and St. Methodius Church |
| St. David Catholic Church |
| St. Denis Catholic Church |
| St. Edward's Convent, (Former) |
| Steep Falls Library |
| Stetson Union Church |
| Stevens, John Calvin, House |
| Stewart Free Library |
| St. Hyacinth School and Convent |
| Stimson Memorial Hall |
| St. James Episcopal Church |
| St. John Catholic Church |
| St. John's Catholic Church |
| St. John's Episcopal Church |
| St. Joseph's Academy and Convent-Catherine McAuley School |
| St. Joseph's Catholic Church |
| St. Joseph's School |
| St. Lawrence Church |
| St. Mark's Episcopal Church |
| St. Mary's-By-The-Sea |
| St. Mary's Church |
| Stockton Springs Community Church |
| Stone, Capt. Nataniel, House |
| Stone, Elisha F., House |
| Stone House |
| Stone Schoolhouse |
| Stonington Opera House |
| Stover, Capt. Johnson H. Jr., House |
| Stowe, Harriet Beecher, House |
| St. Patrick's Catholic Church |
| St. Paul's Church and Rectory |
| St. Paul's Episcopal Church |
| St. Peter's By-The-Sea Protestant Episcopal Church |
| Strand Theatre |
| Strathglass Building |
| Sts. Peter and Paul Church |
| Sturgis and Haskell Building |
| Sturtevant Hall |
| Summer Street Block |
| Sunnycroft |
| Sunset Lodge |
| Surry Town Hall |
| Surry Village School |
Data from United States Park Service and Wikidata
