All - Constructed - 1830–1839
| Julien, Denis, Inscription |
| Keefe-Mumbower Mill |
| Kelvin |
| Kilgore, Josiah, House |
| Kingston/Rondout 2 Lighthouse |
| Kitchen, Van, House |
| Kittredge, Alvah, House |
| Knapp, William, House |
| Knowlton, Jabez, Store |
| Koontz House |
| Kunkle Log House |
| Laurens County Courthouse |
| Lawrence Academy |
| Lee's Creek Covered Bridge |
| Leigh, Ichabod, House |
| Leon High School |
| Lincoln, Anselm, House |
| Little Cumberland Island Lighthouse |
| Little Red School House 1835 District No. 7 |
| Live Oaks Plantation |
| Livingston Parish Courthouse, Old |
| Lochinvar |
| Lockkeeper's House, C & O Canal Extension |
| Lock Tender's House and Inn |
| Locust Grove |
| Logan Methodist Church |
| Longwood |
| Loomis Family Farm |
| Magnolia Hill |
| Maguire, Patrick, House |
| Manchester Historic District |
| Mangum, James, House |
| Mann, Donald, House |
| Maples, The |
| Maplewood Cemetery |
| Marblehead Light |
| Marble Schoolhouse |
| Mariaville Historic District |
| Marshall Point Light Station |
| Marsh-Warthen House |
| Marston House |
| Martin, Sidney, House |
| Massenburg Plantation (Boundary Increase) |
| Mayfield, John, House |
| Mays-Boddie House |
| McConnell House, Law Office, and Slave Quarters |
| McFarland-Render House |
| McGregor |
| McGuire-Setzer House |
| McLemore Cemetery |
| McMillan House |
| Merchants' Exchange Building |
| Mermaid House Hotel |
| Merriconegan Farm |
| Metropolitan African Methodist Episcopal Church |
| Mill at Freedom Falls |
| Millwood |
| Mitchell-Rountree House |
| Morel-Nott House |
| Morrill, Lot, House |
| Morrison, Alfred W., House |
| Mortland Family Farm |
| Moss Grove Plantation House |
| Moultonborough Town House |
| Mount Auburn Cemetery |
| Mount Desert Light Station |
| Mount Hope Cemetery |
| Mount Lebanon Chapel and Cemetery |
| Myrtle Bank |
| Nauset Beach Light |
| Neal, James, House |
| Ned Point Light |
| Neibert-Fisk House |
| Neighbor, Jacob Wise (J. W.), House |
| Nelson Schoolhouse |
| Newport Artillery Company Armory |
| New York City Marble Cemetery |
| New York Marble Cemetery |
| Nickels-Sortwell House |
| Nix's Mate Daybeacon |
| Noble, Jonathan, House |
| North Carolina State Capitol |
| Oak Grove |
| Oak Grove Plantation Dependencies |
| Oakland Chapel |
| Oaklands |
| Oakwood |
| Oberlin College |
| Odell-Locke-Randolph Cotton Mill |
| Ogdensburg Harbor Lighthouse |
| Olcott, John E., House |
| Old Governor's Mansion |
| Old Indian Agency House |
| Old Pine Church |
| Old State Capitol |
| Old State Capitol |
| Old Stone Barracks |
| Old Sugar Mill of Koloa |
| Old Town House |
| Olney Cook Artisan Shop |
Data from United States Park Service and Wikidata
