Massachusetts - Area of significance: Social History
| North Burial Ground |
| North Canal Historic District |
| North Cemetery |
| North Falmouth Village Historic District |
| Northfield Center Cemetery |
| North Hadley Historic District |
| Northside Historic District |
| Oak Grove Cemetery |
| Oak Grove Cemetery |
| O'Brien, Richard, Three-Decker |
| O'Connor, James-John Trybowski Three-Decker |
| O'Connor, James, Three-Decker |
| Odd Fellow's Hall |
| Odd Fellows Hall |
| Odd Fellows' Home |
| Ohabei Shalom Cemetery |
| Old Burial Hill |
| Old Burying Ground |
| Old Burying Ground |
| Old Churchyard Cemetery |
| Old North Cemetery |
| Old Public Library |
| Old Shephard Farm |
| Old Town Farm |
| Old Town Hall |
| Old Town Hall Historic District |
| Oliver House |
| Olmsted Subdivision Historic District |
| Osgood Hill |
| Oxford Main Street Historic District |
| Padanaram Village Historic District |
| Paine, Robert Treat, Jr., House |
| Palmer School |
| Pan Burying Ground |
| Park Street District |
| Park Street Railroad Station |
| Parsons, Shepherd and Damon, Houses Historic District |
| Pawtucket Congregational Church |
| Peabody City Hall |
| Peabody, George, House |
| Peabody Institute |
| Peirce, Edward, House-Henderson House of Northeastern University |
| Pembroke Friends Meetinghouse |
| Pepperell Center Historic District |
| Perry Avenue Historic District |
| Pest House |
| Petterson, Lars-Adolph Carlson Three-Decker |
| Petterson, Lars-Fred Gurney Three-Decker |
| Petterson,Lars-James Reidy Three-Decker |
| Petterson, Lars-Silas Archer Three-Decker |
| Phipps Street Burying Ground |
| Pierce House |
| Pilgrim Memorial Church and Parish House |
| Pill Hill Historic District |
| Pine Grove Cemetery |
| Pine Grove Cemetery |
| Pine Grove Cemetery |
| Pinkham, Lydia, House |
| Plainfield Center Historic District |
| Pleasant Street Historic District |
| Point Allerton Lifesaving Station |
| Polish National Home |
| Pond Hill School |
| Pondville Cemetery |
| Poor House and Methodist Cemetery |
| Porcellian Club |
| Power, Charles Whittlesey, House |
| Powers Institute Historic District |
| Prentiss, Addison, House |
| Prince Hall Mystic Cemetery |
| Prospect-Gaylord Historic District |
| Prospect Hill Cemetery |
| Providence Court |
| Providence Street Historic District |
| Provost, Arthur, Three-Decker |
| Putnam Street Historic District |
| Quadrangle-Mattoon Street Historic District |
| Quincy Grammar School |
| Ramsdell Public Library |
| Reed, Frank, Three-Decker |
| Richards, Ellen H. Swallow, House |
| Ridgewood Cemetery |
| Ridyard, Albert, Three-Decker |
| Ridyard, B. E., Three-Decker |
| Riley, Charles, House |
| Ringville Cemetery |
| Riordan, John, Three-Decker |
| Roberts House |
| Robin Hill Cemetery |
| Rockland Almshouse |
| Rocklawn Cemetery |
| Rockwood Road Historic District |
| Rocky Neck Historic District |
| Roslindale Baptist Church |
| Ross Farm |
| Roughan Hall |
| Roxbury Presbyterian Church |
| Roynane, Catharine, Three-Decker |
| Rumney Marsh Burying Ground |
| Rural Cemetery and Friends Cemetery |
Data from United States Park Service and Wikidata
