Louisiana - Area of significance: Architecture
| St. Elizabeth Catholic Church |
| St. Emma |
| Stephanie Plantation House |
| Sterling Grove Historic District |
| Stevenson House |
| Stewart-Dougherty House |
| St. Francis Chapel |
| St. Francisville Historic District |
| St. Francis Xavier Cathedral |
| St. Gabriel Roman Catholic Church |
| St. George Plantation House |
| St. James AME Church |
| St. James Episcopal Church |
| St. John Baptist Church |
| St. John's Cathedral |
| St. John's Episcopal Church |
| St. John's Episcopal Church and Cemetery |
| St. Joseph Cathedral |
| St. Joseph Church-Convent of the Most Holy Sacrament Complex |
| St. Joseph Historic District |
| St. Joseph Plantation House |
| St. Julien House |
| St. Landry Catholic Church |
| St. Louis Cemetery No. 1 |
| St. Louis Cemetery No. 2 |
| St. Louis Plantation |
| St. Mark's Episcopal Church |
| St. Martin of Tours Catholic Church |
| St. Martin Parish Courthouse |
| St. Martinville Historic District |
| St. Mary Congregational Church |
| St. Mary Magdalen Church, Rectory, and Cemetery |
| St. Mary's Assumption Church |
| St. Mary's Assumption Church |
| St. Mary's Episcopal Church |
| St. Mary's Episcopal Church |
| St. Maurice Methodist Church |
| St. Michael's Church Historic District |
| Stoker House |
| St. Patrick's Catholic Church |
| St. Patrick's Church |
| St. Paul's Bottoms |
| St. Peter A.M.E. Church |
| St. Philip's Episcopal Church |
| St. Philomene Catholic Church and Rectory |
| Strand Theatre |
| Stribling House |
| St. Stephen's Episcopal Church |
| St. Thomas the Apostle Catholic Church and Cemetery |
| Sullivan House |
| Sunnybrook |
| Swearingen House |
| Sylvan Retreat |
| Sylvest House |
| Synope Plantation House |
| Talbert-Pierson Grave Shelters |
| Tallulah High School |
| Tallulah Men's Club Building |
| Tallulah Post Office |
| Tally-Ho Plantation House |
| Tally's Bank |
| Tate House |
| Taylor House |
| Taylor, John R., Drugstore |
| Tchefuncte River Range Rear Light |
| Teddy Avenue Residential Historic District |
| Tensas Parish Courthouse |
| Tessier Buildings |
| Tewell House |
| Texaco Building |
| Texaco Service Station |
| Texas and Pacific Railroad Depot |
| Texas Avenue Buildings |
| Thibodaux, Jean Baptiste, House |
| Thomas House |
| Thompson House |
| Thrasher House |
| Thurmond House |
| Tillandsia |
| Todd, Dr. John W., House |
| Toups, Zephirin, Sr., House |
| Towles-Musso House |
| Trinity |
| Trinity Episcopal Church |
| Trio Plantation House |
| Trosper House |
| Trudeau House |
| Tulane University of Louisiana |
| Tulip Methodist Church |
| Turner's Hall |
| Turpin-Kofler-Buja House |
| Twitchell House |
| Tyrone Plantation |
| Union Federal Savings and Loan Association |
| United States Coast Guard Station No. 79 |
| Upper Central Business District |
| Uptown New Orleans Historic District |
| U.S. Court of Appeals-Fifth Circuit |
| U.S. Customhouse |
| U.S. Mint, New Orleans Branch |
Data from United States Park Service and Wikidata
