All Names
- M. Keller & J. Neff (Firm)
- M.B. Brown & Co. (2)
- Macbrair, Archibald (2)
- Magee, John L. (29)
- Magnus, Charles.
- Maolsehber, C.
- Marpé, August
- Marsh, Bela, 1797-1869.
- Matier & Kent
- Matteson, Tompkins Harrison, 1813-1884
- Maurer, Louis, 1832-1932 (23)
- Maurer, Ludwig, 1789-1878. (2)
- McCaffrey, Henry. (2)
- McClean, Alexander. (2)
- McGouldrick, J. (2)
- Medairy, John, approximately 1798-1857.
- Mendel, Edward, 1827-1884
- Merinsky, Svobodin. (2)
- Merrihew and Gunn.
- Metcalf & Clark (2)
- Middleton, Strobridge & Co.
- Miller & Beacham.
- Miller, William.
- Milne, Colin R., approximately 1817-
- Moore, Thomas
- Moore, Thomas, 1798 or 1799-1842.
- Morandi, Frances
- Morse, C. F.
- Mouls, J. (Joseph)
- Muringer, Caspar
- Murphy, John, 1812-1880.
- Murray, George, -1822
