Massachusetts - Significance region: Local
| Newton Street School |
| New York, New Haven & Hartford Passenger Depot |
| Nichols, Daniel, Homestead |
| Nichols, James, House |
| Nichols, Jerry, Tavern |
| Nichols, John F., House |
| Nichols, Richard, House |
| Nichols-Sterner House |
| Nickerson Mansion |
| Nightengale House |
| Nightengale, Solomon, House |
| Niles, Louville, House |
| Niles, Louville V., House |
| Nix's Mate Daybeacon |
| No. 4 Schoolhouse |
| Nobility Hill Historic District |
| Nobscot Union Chapel |
| Norad Mill |
| Norcross, William, House |
| Norfolk Grange Hall |
| Normal School Historic District |
| North Acton Cemetery |
| North Amherst Center Historic District |
| Northampton Downtown Historic District |
| North Andover Center Historic District |
| North Attleborough Town Center Historic District |
| North Avenue Congregational Church |
| North Avenue Rural Historic District |
| North Becket Village Historic District |
| North Bedford Historic District |
| North Bellingham Cemetery and Oak Hill Cemetery |
| Northbound and Southbound Stations |
| North Brookfield Town House |
| North Burial Ground |
| North Cemetery |
| North Cemetery |
| North Chester Historic District |
| North Downtown Historic District |
| Northeast School |
| North Egremont Historic District |
| North Falmouth Village Historic District |
| Northfield Center Cemetery |
| Northfield Main Street Historic District |
| North Hadley Historic District |
| North Hatfield Historic District |
| North High Street Historic District |
| North Leverett Historic District |
| North Lexington Street Historic District |
| North Rochester Congregational Church |
| Northside Historic District |
| Northside Village Historic District |
| North Street Fire Station |
| North Taunton Baptist Church |
| North Terminal Garage |
| North Town Hall |
| North Village Cemetery |
| North Village Historic District |
| Norton Center Historic District |
| Norton House |
| Norwell Village Area Historic District |
| Norwood-Hyatt House |
| Norwood Memorial Municipal Building |
| Notre Dame Catholic Church |
| Noves, Charles W., House |
| Nowland, J. Martin, House |
| Nye, Benjamin, Homestead |
| Nye, Elnathan, House |
| Oakdale Village Historic District |
| Oakes, Edward, House |
| Oakes, J. J., House |
| Oak Grove Cemetery |
| Oak Grove Cemetery |
| Oak Grove Farm |
| Oakham Center Historic District |
| Oak Knoll |
| Oak Square School |
| O'Brien, Richard, Three-Decker |
| O'Connor, James-John Trybowski Three-Decker |
| O'Connor, James, Three-Decker |
| Octagon House |
| Octagon House |
| Oddfellows Building |
| Odd Fellows Building |
| Odd Fellow's Hall |
| Odd Fellows' Hall |
| O'Hara Waltham Dial Company |
| Olcott, John E., House |
| Old Billerica Road Historic District |
| Old Burying Ground |
| Old Burying Ground |
| Old Burying Ground |
| Old Cambridge Historic District |
| Old Cambridgport Historic District |
| Old Castle |
| Old Cemetery |
| Old Central Fire Station |
| Old Central High School |
| Old Centre Historic District |
| Old Chelmsford Garrison House Complex |
| Old Churchyard Cemetery |
Data from United States Park Service and Wikidata
