Pennsylvania - Area of significance: Architecture
| Radnor Friends Meetinghouse |
| Rafsnyder-Welsh House |
| Railroad Borough Historic District |
| Ralston, Robert, School |
| Ramcat Historic District |
| Ramsey, J. Sylvester, School |
| Randolph House |
| Rapp's Bridge |
| Ravensburg State Park |
| Raymond, Charles and Joseph, Houses |
| Reading Company Grain Elevator |
| Reading Furnace Historic District |
| Reading Hardware Company |
| Reading Railroad Freight Station |
| Reading Railroad Passenger Station-Tamaqua |
| Reading Railroad Station |
| Reading Terminal and Trainshed |
| Read, Thomas Buchanan, School |
| Real Estate Building |
| Rebersburg Historic District |
| Red Hill Church and School |
| Red Hill Historic District |
| Red Lion Borough Historic District |
| Red Men Hall |
| Red Run Lodge |
| Reed, Charles Manning, Mansion |
| Regent-Rennoc Court |
| Regester Log House |
| Reiff Farm |
| Reilly Brothers and Raub Building |
| Reinholds Station Trinity Chapel |
| Reppert-Gabler House |
| Revloc Historic District |
| Rex House |
| Rex, John, Farm |
| Reyer, Peter and Catherine, Farmhouse |
| Reymer Brothers Candy Factory |
| Reynolds, Gen. John F., School |
| Reynolds-Morris House |
| Rhoads Homestead |
| Rhoads-Lorah House and Barn |
| Rice-Pennebecker Farm |
| Rice's Landing Historic District |
| Richardson, Joseph, House |
| Richmond School |
| Richmond Station, Philadelphia Electric Company |
| Ricketts, Clemuel, Mansion |
| Ridge Avenue Farmers' Market |
| Ridge Valley Rural Historic District |
| Ridgewood Farm |
| Ridgway Armory |
| Ridgway Historic District |
| Ridley Creek State Park |
| Riegel, Benjamin, House |
| Rieser Mill |
| Rieser-Shoemaker Farm |
| Rieth, Andreas, Homestead |
| Ringgold Place |
| Ringland Tavern |
| Risley, Dr. Samuel D., House |
| Rittenhouse, David, Junior High School |
| Rittenhouse Historic District |
| River Bend Farm |
| Riverside Farm |
| Riverside Hotel |
| River Street Historic District |
| Riverview Park |
| 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 |
| Rocky Spring Presbyterian Church |
| Rodef Shalom Temple |
| Rodeph Shalom Synagogue |
| Roebling, John, House |
| Rogers, Philip, House |
| Rohm and Haas Corporate Headquarters |
| Romberger-Stover House |
| Rooke, Robert, House |
| Roosevelt, Theodore, Junior High School |
| Ross Common Manor |
| Ross, Frank L., Farm |
| Ross, Moses, House |
| Rotunda of the Pennsylvania Railroad Station |
| Roueche House |
| Roughwood |
| Rowen, William, School |
| Rowland House |
| Rowland Theater |
| Royal Theater |
| Royer, Daniel, House |
| Royer-Nicodemus House and Farm |
| Ruan, John, House |
| Rush, Benjamin, House |
| Russell House |
Data from United States Park Service and Wikidata
