Maryland - Role: Building
| Ridgley Methodist Episcopal Church |
| Rieman Block |
| Rigbie House |
| Riley-Bolten House |
| Rising Sun Inn |
| River Road Unitarian Church |
| Riversdale |
| River View, The |
| Riviera Apartments |
| Roberts Inn |
| Robinson House |
| Rock Clift |
| Rock Creek Methodist Episcopal Church |
| Rockdale |
| Rockland |
| Rockland Farm |
| Rockland Farm |
| Rockledge |
| Rock Methodist Episcopal Church |
| Rock United Presbyterian Church |
| Rockville Railroad Station |
| Rodgers Tavern |
| Rohrer House |
| Rombro Building |
| Rosehill |
| Rose Hill |
| Rose Hill |
| Rose Hill |
| Rose Hill |
| Rose Hill Manor |
| Rosemary Lawn |
| Round About Hills |
| Routzahn-Miller Farmstead |
| Rowhouses at 303-327 East North Avenue |
| Rowland, Henry August, House |
| Royer, Christian, House |
| Rudisel, Ludwick, Tannery House |
| Ruscombe |
| Saint Mary's Rectory |
| Saint Michaels Mill |
| Saleaudo |
| Salisbury Plantation |
| Salmon-Stohlman House |
| Samester Parkway Apartments |
| Sandgates On Cat Creek |
| San Domingo School |
| Sands, John, House |
| Sandy Point Farmhouse |
| Sandy Spring Friends Meetinghouse |
| Sanitary Laundry Company Building |
| Sarum |
| Savage Mill |
| Scheifferstadt |
| Schoolhouse, Denton |
| School No. 27 (Commodore John Rodgers Elementary School) |
| Schoolridge Farm |
| Schuler, Hans, Studio and Residence |
| Schwartze Mansion |
| Scott, Lula G., Community Center |
| Scott, Robert and Phyllis, House |
| Scott, Upton, House |
| Search Well |
| Sellers Mansion |
| Senator Theatre |
| Shaarei Tfiloh Synagogue |
| Shafer's Mill |
| Shaffer, Jacob F., Farm |
| Sharp Street Memorial United Methodist Church and Community House |
| Shaw Mansion |
| Sheffer, Daniel, Farm |
| Shepherd's Delight |
| Sheppard and Enoch Pratt Hospital and Gatehouse |
| Sherwood Manor |
| Shoemaker, Henry, Farmhouse |
| Shrewsbury Church |
| Silver Spring Baltimore and Ohio Railroad Station |
| Simpson's Grove |
| Sion Hill |
| Slagle-Byers House (CARR-821) |
| Slate Ridge School |
| Smeltzer, Henry, Farmstead |
| Smith, Gov. John Walter, House |
| Smith, Harry, House |
| Smith, William S., House |
| Snively Farm |
| Snow Hill |
| Sonneborn Building |
| Sophia's Dairy |
| Sotterley |
| Southern District Police Station |
| South River Club |
| Sprechers Mill House |
| Spring Bank |
| Springfield Farm |
| Springfield Presbyterian Church |
| Spring Hill Church |
| Spye Park |
| Stagg Hall |
| St. Alphonsus' Church, Rectory, Convent and Halle |
| Stancioff House |
Data from United States Park Service and Wikidata
