All - Architectural style - Colonial Revival architecture
| National Bank of Rolla Building |
| National Home, Daughters of America |
| Neathery, Sam, House |
| Neely-Sieber House |
| Neenah United States Post Office |
| Nelden, William A., House |
| Nelson, Christina, Three-Decker |
| Nettleton, George H., Home |
| Neuhaus, C. L., House |
| New Albany Hotel |
| Newark Broad Street Station |
| New Century Club |
| New Century Clubhouse |
| New Colonial Hotel |
| New Hampshire Conservatory of Music and the Arts |
| New Jersey Manual Training and Industrial School for Colored Youth |
| New Market United Methodist Church |
| New Perry Hotel |
| Newport National Bank |
| Newport News Public Library |
| New Suffolk School |
| New Sweden School |
| Newton City Hall and War Memorial |
| Newton, Edward B., School |
| New York Congregational Home for the Aged |
| Nichols, Capt. John P., House |
| Nichols, Edward, House |
| Nicolai, Harry T., House |
| Nicolson, William P., House |
| Ninde-Mead-Farnsworth House |
| Ninth Street Office Building |
| Nixon Homestead |
| Noble House |
| Norfolk & Western Railway Freight Station |
| Norman Vale |
| North East Neighborhood House |
| North Hempstead Town Hall |
| North Main Street School |
| North Olmsted Town Hall |
| Northrup House |
| North Uxbridge School |
| Norton, Charles H., House |
| Nortonia Boarding House |
| Norwalk City Hall |
| Notre Dame School |
| Noyes, J.A., House |
| Noyes Mansion |
| Numbers, Dr. J. R., House |
| Nu-Wray Inn |
| Nyberg-Swanson House |
| Oakdale |
| Oak Dell |
| Oakes, Augustus J., House |
| Oakes Estate |
| Oakhurst Links |
| Oak Knoll |
| Oakland |
| Oakland Free Library-Golden Gate Branch |
| Oakmoor |
| Oakslea Place |
| Oak Square School |
| O'Brien, Mathew, House |
| Ochs, Adolph C., House |
| Ocilla Public School |
| Ockershausen, Henry, House |
| Ockers, Jacob, House |
| O'Connor, James-John Trybowski Three-Decker |
| O'Conor, Andrew J., III, House |
| O'Donohue, C. A., House |
| Ogle, Joseph, House |
| Ogontz Hall |
| O'Grady, Mr. J. William de Coursey, House |
| Ogunquit Playhouse |
| Ohev Sholem Synagogue |
| Ohio One-Ohio Edison |
| Old Baker County Courthouse |
| Old Colony Club |
| Old Fernald-Laughton Memorial Hospital |
| Old Greenwood High School |
| Old Guaranty Bank Building |
| Old Hose House |
| Old Las Vegas Post Office |
| Old People's Home |
| Old People's Home |
| Old Portlock School #5 |
| Old Post Office |
| Old Post Office Building |
| Old Saybrook Town Hall and Theater |
| Old Southeast Town Hall |
| Old South Mebane Historic District |
| Old Town Hall |
| Old Town Residential Historic District |
| Old U.S. Forest Products Laboratory |
| Olive Street Historic District |
| Olney, George A., House |
| Olson, Oscar, House |
| Opera House-Starnes Jewelers Building |
| Orchestra Hall |
| Ormonde |
| Ormonde Apartment Building |
Data from United States Park Service and Wikidata
