 | Imperator (Ship) (1) |
| | International Union Steam Engineers (1) |
| | Iron Molders' International Union (2) |
| | Jewish Temple (Washington, D.C.) (2) |
| | John Paul Jones Memorial (Washington, D.C.) (6) |
| | Knights of Labor (33) |
| | Knights of Labor -- Membership (1) |
| | Knights of Labor -- Seal (1) |
| | Koenigin Luise (Ship) (2) |
| | Library of Congress (12) |
| | Lord of the Isles (Vehicle) (1) |
| | Marble Arch (London, England) (1) |
| | Masonic Temple (Washington, D.C.) (19) |
| | Memorial Continental Hall (Washington, D.C.) (1) |
| | Miners' National Association (U. S.) (2) |
| | Mings Falls (Carbondale, Pa.) (2) |
| | Mirror Lake (Washington, D.C.) (1) |
| | Mt. Vernon Church (Washington, D.C.) (1) |
| | Mulley's Department Store (Scranton, Pa.) (1) |
| | Municipal Building (Washington, D.C.) (2) |
| | Munsey Building (Washington (D.C.)) (2) |
| | Museum of Natural History (U.S.) (2) |
| | National Bank for Savings (Washington, D.C.) (1) |
| | National Hotel (Washington, D.C.) (2) |
| | National Labor Union (U.S.) (1) |
| | National Metropolitan Bank (Washington, D.C.) (4) |
| | National Union of Machinists and Blacksmiths (U.S.) (1) |
| | National Zoological Park (U.S.) (8) |
