All - Architectural style - Federal architecture
| Porter House |
| Port Micou |
| Portsmouth Athenaeum |
| Post, Augustus, House |
| Potter Hall |
| Potter-O'Brian House |
| Potter-Remington House |
| Powell Farm |
| Powell House |
| Powell House |
| Powell, John, House |
| Pratt, Dexter, House |
| Pratt, Dr. Ambrose, House |
| Pratt-Faxon House |
| Pratt House |
| Pratt-McDaniels-LaFlamme HOuse |
| Prattsville Reformed Dutch Church |
| Pratt, Zadock, House |
| Preston House |
| Preston House |
| Priestley, Dr. Joseph, House |
| Priestley, Joseph, House |
| Prince, Cushing and Hannah, House |
| Proctor, William, House |
| Prospect |
| Prospect Hall |
| Prospect Hill |
| Prospect Hill |
| Protectworth Tavern |
| Protestant Children's Home |
| Prouty, Jed, Tavern and Inn |
| Provost |
| Pruyn, Casparus F., House |
| Pugh, Capt. David, House |
| Pumpkin House |
| Puncheon Mill House |
| Puppy Creek Plantation |
| Puryear, Mordecai, House |
| Pyne, Jonathan, House |
| Quaker Lane Farms |
| Quaker Meadows |
| Quimby, Dr. Samuel, House |
| Quincy Library |
| Quincy Woman's Club |
| Railroad Hotel |
| Rally Hill |
| Randall Farm |
| Randall-Hildreth House |
| Randall, Jacob, House |
| Rasmussen, Morten, House |
| Ratcliff Inn |
| Rather, John Daniel, House |
| Ravenswood |
| Raynham |
| Readfield Union Meeting House |
| Ready, Charles, House |
| Record, E.C. and M.I., Homestead |
| Red Brick Tavern |
| Red Fox Inn |
| Red Hill Farm |
| Redington House |
| Redlands |
| Red Lane Tavern |
| Redman Farm House |
| Reed, G. W., Travellers Home |
| Reed-Wood Place |
| Rees, John, David, and Jacob, House |
| Rees, Morris, III House |
| Reeves, W. L., House |
| Reformed Church, The |
| Reformed Dutch Church, Parsonage and Lecture Hall |
| Reformed Presbyterian Church Parsonage |
| Reid-White-Philbin House |
| Remick, Capt. Enoch, House |
| Remington House |
| Residence, The |
| Reveille |
| Ricards House-Linden Hall |
| Rice's Hotel |
| Richards Mansion |
| Richardson, John, House |
| Richardson, Joseph, House |
| Richard, Stephen, House |
| Richey, John, House |
| Richland |
| Richland Plantation |
| Richmond |
| Richmond Hill |
| Rich Mountain |
| Rich, Samuel, House |
| Riddick House |
| Rider Tavern |
| Ridgeway |
| Ridgewood Farm |
| Rieser-Shoemaker Farm |
| Riga Academy |
| Riggs, Benjamin, House |
| Riggs-Zorach House |
| Ringgold-Carroll House |
| Ringland Tavern |
Data from United States Park Service and Wikidata
