Maryland - Role: Building
| Standard Oil Building |
| St. Andrew's Church |
| St. Andrew's Episcopal Chapel |
| Stanley Institute |
| Stanton Center |
| Starr Church |
| St. Bartholomew's Episcopal Church |
| St. Brigid's School and Convent |
| St. Catharine |
| St. Elizabeth of Hungary |
| St. Euphemia's School and Sisters' House |
| Stevensville Bank |
| Stewart's Department Store |
| St. Francis Xavier Church |
| St. George's Parish Vestry House |
| St. Giles |
| Stieff Silver Company Factory |
| St. Ignatius Church |
| St. Ignatius Church |
| St. Ignatius Roman Catholic Church |
| St. James Church |
| St. James Church |
| St. James the Less Roman Catholic Church |
| St. John's Chapel of St. Michael's Parish |
| St. John's Church |
| St. John's Church |
| St. John's Methodist Episcopal Church and Joshua Thomas Chapel |
| St. John's Protestant Episcopal Church |
| St. John the Evangelist Roman Catholic Church |
| St. Leo's Church |
| St. Luke's Church |
| St. Luke's Church |
| St. Mark's Episcopal Church |
| St. Mark's Episcopal Church-Lappans |
| St. Martins Church |
| St. Mary's Benefical Society Hall |
| St. Mary's Church |
| St. Mary's Episcopal Church/Woodlawn |
| St. Mary's Roman Catholic Church, Newport |
| St. Mary's Seminary Chapel |
| St. Matthew's Church |
| St. Michael's Church |
| St. Michael's Church Complex |
| Stonebraker and Harbaugh-Shafer Building |
| Stone Hall |
| Stoner-Saum Farm |
| St. Paul's by-the-sea Protestant Episcopal Church |
| St. Paul's Chapel |
| St. Paul's Church |
| St. Paul's Church Rectory |
| St. Paul's Episcopal Church |
| St. Paul's Episcopal Church |
| St. Paul's Methodist Episcopal Church |
| St. Paul's Parish Church |
| St. Paul's Protestant Episcopal Church |
| St. Paul's Protestant Episcopal Church |
| St. Peter's Church |
| St. Peter's Methodist Episcopal Church |
| St. Peter the Apostle Church and Buildings |
| Stratton |
| Strawberry Hill |
| Streett, Col. John, House |
| St. Richard's Manor |
| St. Stephen's Episcopal Church |
| St. Thomas Church |
| St. Thomas' Church |
| St. Thomas Manor |
| St. Vincent De Paul Roman Catholic Church |
| Sudler's Conclusion |
| Sudley |
| Summer Hill |
| Summit |
| Sumner, Charles, Post #25, Grand Army of the Republic |
| Sunnyfields |
| Sunnyside |
| Surratt House |
| Susanna Farm |
| Swansbury |
| Swiss Steam Laundry Building |
| Sycamore Cottage |
| Tammany |
| Taney Place |
| Tawes, Capt. Leonard, House |
| Taylor, David W., Model Basin |
| Taylor-Manning-Leppo House |
| Taylor's Chapel |
| Teackle Mansion |
| Temora |
| Terminal Warehouse |
| The Maryland Club |
| The Wilderness |
| Thomas and Company Cannery |
| Thomas House |
| Thomas Run Church |
| Tidewater Inn |
| Tipahato |
| Tivoli |
| Todd Farmhouse |
| Tolson's Chapel |
| Town Clock Church |
Data from United States Park Service and Wikidata
