All - Constructed - 1820–1829
| Kerr, Gen. William, House |
| Kerr-Patton House |
| King-Freeman-Speight House |
| King, Tandy, House |
| Kirkbride House |
| Knight, J. B., House |
| Lancaster County Courthouse |
| Lancaster County Jail |
| Lassiter House |
| Laurietta |
| Lawrenceville Street Historic District |
| Ledbetter, Albertus, House |
| Leicester Meeting House |
| Libby Island Light Station |
| Lincoln's New Salem Village |
| Long Point Light Station |
| Longwood |
| Losee, John, House |
| Lothrop, Caleb, House |
| Lovell, Capt. George, House |
| Lovett's by Lafayette Brook |
| Maden Hall Farm |
| Madison Masonic Lodge |
| Maine State House |
| Manley-Lefevre House |
| Manse, The |
| Maplewood |
| Marblehead Lighthouse |
| Marmon, Martin, House |
| Marquart-Mercer Farm |
| Matinicus Rock Light Station |
| McCleary Farm |
| McCutchen Meadows |
| Methodist Church |
| Mexico Academy and Central School |
| Milldean and Alexander-Davis House |
| Mill Hill |
| Mission House |
| Monhegan Island Lighthouse and Quarters |
| Monomoy Point Lighthouse |
| Montrose Mansion and Chapel |
| Montville Town House |
| Moody Farm |
| Morris County Courthouse |
| Murray, James H., House |
| Musical Fund Hall |
| Naval Live Oaks Reservation |
| Nayatt Point Lighthouse |
| New Echota |
| New England Lodge |
| New Lots Reformed Church and Cemetery |
| Newman, Andrew, House |
| Newport Harbor Lighthouse |
| Nobska Point Light Station |
| Noland, Jesse, House |
| North Wilmot Union Meetinghouse |
| Nutting Hall |
| Oakley |
| Oak Spring Farm |
| Old Cathedral Complex |
| Old City Cemetery |
| Old Corner Bookstore |
| Old Kingsport Presbyterian Church |
| Old Roman Catholic Cathedral |
| Old Stone House Library, The |
| Old Stone Warehouse |
| Old West, Dickinson College |
| Owls Head Light Station |
| Parkman, Francis, House |
| Parsonage, The |
| Peirce Mill |
| Pemaquid Point Light |
| Pennsylvania Institute for the Deaf and Dumb |
| Perquimans County Courthouse |
| Perry, David, House |
| Phoenix Building |
| Pilgrim Hall |
| Poinsett Bridge |
| Point Gratiot Lighthouse Complex |
| Pooles Island Lighthouse |
| Portland High School |
| Portsmouth Naval Hospital |
| Potter-Williams House |
| Powers, Strange, House |
| Priestley, Dr. Joseph, House |
| Protestant Episcopal Theological Seminary |
| Quincy Granite Railway |
| Quincy Market |
| Reformed Dutch Church, Parsonage and Lecture Hall |
| Rioux, Angeline Champeau, House |
| Roanoke Canal |
| Roberts Covered Bridge |
| Rock Cliff |
| Rosalie |
| Round Schoolhouse |
| Rural Glen Cemetery |
| Sanderson, John, House |
| Sand Key Lighthouse |
| Santa Fe Trail-Kearny County Segment 1 |
| Sapelo Island Lighthouse |
Data from United States Park Service and Wikidata
