Maryland - Significance region: Local
| Presbury Meetinghouse |
| President Street Station |
| Price-Miller House |
| Primrose Hill |
| Princess Anne Historic District |
| Pritchard, Dr. William B., House |
| Proctor and Gamble Baltimore Plant |
| Proctor House |
| Prospect Hall |
| Prospect Hill |
| Public School No. 109 |
| Public School No. 111 |
| Public School No. 25 |
| Public School No. 37 |
| Public School No. 99 |
| Puncheon Mill House |
| Purnell, George Washington, House |
| Quarter Place |
| Queenstown Rosenwald School |
| Queponco Railway Station |
| Quindocqua United Methodist Church |
| Radcliffe Mill |
| Radnor-Winston Historic District |
| Rehobeth Presbyterian Church |
| Reisterstown Historic District |
| Remington Historic District |
| Reservoir Hill Historic District |
| Retreat |
| Reward-Tilden's Farm |
| Richland |
| Richland Farm |
| Rich Mountain |
| Ridgeley School |
| Ridgely's Delight Historic District |
| Ridge, The |
| Ridgley Methodist Episcopal Church |
| Rieman Block |
| Riley-Bolten House |
| Rising Sun Inn |
| Riverdale Park Historic District |
| River Road Unitarian Church |
| Riverside Historic District |
| Riviera Apartments |
| Roberts Inn |
| Robinson House |
| Rock Clift |
| Rock Creek Methodist Episcopal Church |
| Rock Creek Woods Historic District |
| Rockdale |
| Rockland |
| Rockland Farm |
| Rockland Farm |
| Rockledge |
| Rock Methodist Episcopal Church |
| Rock United Presbyterian Church |
| Rockville Park Historic District |
| Rodgers Forge Historic District |
| Rohrer House |
| Rolling Mill Historic District |
| Rombro Building |
| Roop's Mill |
| Rosehill |
| Rosemary Lawn |
| Round About Hills |
| Routzahn-Miller Farmstead |
| Rowhouses at 303-327 East North Avenue |
| Rudisel, Ludwick, Tannery House |
| Ruscombe |
| Saint Mary's Rectory |
| Saint Michaels Mill |
| Salmon-Stohlman House |
| Samester Parkway Apartments |
| San Domingo School |
| Sands, John, House |
| Sandy Point Shoal Light Station |
| Sandy Point Site |
| Sanitary Laundry Company Building |
| Schoolhouse, Denton |
| School No. 27 (Commodore John Rodgers Elementary School) |
| Schoolridge Farm |
| Schwartze Mansion |
| Scott, Lula G., Community Center |
| Scott, Robert and Phyllis, House |
| Search Well |
| Sellers Mansion |
| Senator Theatre |
| Shaarei Tfiloh Synagogue |
| Shafer's Mill |
| Shaffer, Jacob F., Farm |
| Sharpsburg Historic District |
| Sharp Street Memorial United Methodist Church and Community House |
| Shaw Mansion |
| Sheffer, Daniel, Farm |
| Shoemaker, Henry, Farmhouse |
| Shrewsbury Church |
| Silver Houses Historic District |
| Silver Spring Baltimore and Ohio Railroad Station |
| Simpson's Grove |
| Skipworth's Addition |
| Slagle-Byers House (CARR-821) |
Data from United States Park Service and Wikidata
