Massachusetts - Role: Building
| 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 |
| No. 4 Schoolhouse |
| Nobscot Union Chapel |
| Norad Mill |
| Norcross Brothers Houses |
| Norcross, William, House |
| Norfolk County Courthouse |
| Norfolk Grange Hall |
| North Abington Depot |
| North Avenue Congregational Church |
| Northbound and Southbound Stations |
| North Brookfield Town House |
| North Christian Congregational Church |
| North Easton Railroad Station |
| Northeast School |
| North Hadley Historic District |
| North Rochester Congregational Church |
| North Street Fire Station |
| North Taunton Baptist Church |
| North Terminal Garage |
| North Town Hall |
| North Uxbridge School |
| North Worcester Aid Society |
| Norton House |
| Norwood-Hyatt House |
| Norwood Memorial Municipal Building |
| Notre Dame Catholic Church |
| Notre Dame School |
| Noves, Charles W., House |
| Nowland, J. Martin, House |
| Noyes, J.A., House |
| Noyes, James, House |
| Noyes-Parris House |
| Nye, Benjamin, Homestead |
| Nye, Elnathan, House |
| Oakes, Edward, House |
| Oakes, J. J., House |
| Oak Grove Farm |
| 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 |
| Odd Fellows' Hall |
| Odd Fellows' Home |
| O'Hara Waltham Dial Company |
| Olcott, John E., House |
| Old Barn |
| Old Cambridge Baptist Church |
| Old Castle |
| Old Central Fire Station |
| Old Central High School |
| Old Chapel |
| Old Chelmsford Garrison House Complex |
| Old City Hall |
| Old Colony Iron Works-Nesmasket Mills Complex |
| Old Colony Railroad Station |
| Old Corner Bookstore |
| Old County Courthouse |
| Old Farm |
| Old Garrison House |
| Old Harbor U.S. Life Saving Station |
| Old Hose House |
| Old Indian Meeting House |
| Old Jail |
| Old Lynn High School |
| Old Manse |
| Old Medford High School |
| Old Mill |
| Old North Church |
| Old Post Office Building |
| Old Post Office Building |
| Old Public Library |
| Old Schwamb Mill |
| Old Shephard Farm |
| Old Ship Meetinghouse |
| Old South Church in Boston |
| Old South Meeting House |
| Old South Union Church |
| Old State House |
| Old State Mutual Building |
| Old Stone Church |
| Old Third District Courthouse |
| Old Town Farm |
| Old Town Hall |
Data from United States Park Service and Wikidata
