Pennsylvania - Criteria: C (architecture/engineering)
| Risley, Dr. Samuel D., House |
| Rittenhouse, David, Junior High School |
| Rittenhouse Square |
| River Bend Farm |
| Riverside Farm |
| Riverside Hotel |
| River Street Historic District |
| Roaring Spring Historic District |
| Robertsdale Historic District |
| Roberts, Enoch, House |
| Roberts House |
| Roberts-Quay House |
| Robesonia Furnace Historic District |
| Robinson House |
| Robinson, Jesse, House |
| Rock Hill Farm |
| Rockland Furnace |
| Rockville Bridge |
| Rocky Spring Presbyterian Church |
| Rodef Shalom Temple |
| Rodeph Shalom Synagogue |
| Roebling, John, House |
| Rogers, Philip, House |
| Rohm and Haas Corporate Headquarters |
| Rohrbach Covered Bridge No. 24 |
| Romberger-Stover House |
| Rooke, Robert, House |
| Roosevelt, Theodore, Junior High School |
| Rose Valley Historic District |
| Ross Common Manor |
| Ross, Frank L., Farm |
| Ross Furnace |
| Ross, Moses, House |
| Roueche House |
| Roughwood |
| Rowen, William, School |
| Rowland House |
| Rowland Theater |
| Royal Theater |
| Royer, Daniel, House |
| Royer-Nicodemus House and Farm |
| Ruan, John, House |
| Runk Bridge |
| Rupert Covered Bridge No. 56 |
| Rush, Benjamin, House |
| Russell House |
| Ruter Hall |
| Ryerss Mansion |
| Ryon, Judge John, House |
| Ryot Covered Bridge |
| Saeger, Edward, House |
| Salem Evangelical Lutheran Church |
| Salem United Church of Christ |
| Sally Ann Furnace Complex |
| Saltsburg Historic District |
| Sanatoga Union Sunday School |
| Sandy Hill Tavern |
| Sansom Row |
| Sauer Buildings Historic District |
| Saxonburg Historic District |
| """S"" Bridge" |
| S Bridge |
| Scenery Hill Historic District |
| Schaeffer, Charles, School |
| Schall, William and Caroline, House |
| Schaumboch's Tavern |
| Schellsburg Historic District |
| Schenley Farms Historic District |
| Schenley High School |
| Schenley Park |
| Schiller Elementary School |
| Schlegel, Christian, Farm |
| Schlicher Covered Bridge |
| Schlicher, George F., Hotel |
| Schnader, R. K. & Sons, Tobacco Warehouse |
| Schnader, Walter, Tobacco Warehouse |
| Schoonover Mountain House |
| Schrot, Joseph F. and Anna B., Farm |
| Schultz, Martin, House |
| Scott Creek Bridge-North, Maryland and Pennsylvania Railroad |
| Scottdale Armory |
| Scottdale Historic District |
| Scott, David, House |
| Scottish Rite Cathedral |
| Scott, James, House |
| Scott, Thomas, House |
| Scranton Armory |
| Scranton Lace Company |
| Search, George W., House |
| Searight's Fulling Mill |
| Second Bank of the United States |
| Second National Bank of Meyersdale |
| Second Street Bridge |
| Seeds, Hugh D. and Martha S., Farm |
| Seel, William, Building |
| Segers, Redferd, House |
| Seigrist's Mill Covered Bridge |
| Seipsville Hotel |
| Sellers House |
| Seventeen-hundred-and-four House |
Data from United States Park Service and Wikidata
