| M'Adams, William | Silverplater | D 1846-1850 |
| M'Allister, James | Jeweller | D 1840-1841, 1845-1850 |
| M'Calvey, Daniel | Silverplater | D 1837 |
| M'Cann, Michael | Jeweller | D 1839-1845 |
| M'Carter, John | Jeweller & Lapidist | D 1845-1850 |
| M'Carty, Edward | Silversmith | D 1845-1850 |
| M'Carty, John, see M'Carter, John | | |
| M'Clain, William | Jeweller | D 1848 |
| M'Clean, W. S., Jr. | Jeweller | D 1837 |
| M'Cleary, Daniel | Silverplater | D 1837-1841 |
| M'Clever, James | Jeweller | D 1828-1833 |
| M'Closkey, F. | Watchmaker | D 1850 |
| M'Collin, John | Watchmaker | D 1823-1824 |
| M'Collin, Thomas | Watchmaker | D 1824-1833 |
| M'Connel, Hugh | Silversmith | D 1811-1813 |
| M'Connelly, H. | Silversmith | D 1811 |
| M'Cormick, Bernard | Jeweller | D 1844-1850 |
| M'Cormick, Henry | Watchmaker | D 1833 |
| M'Cormick, John | Silversmith | D 1837 |
| M'Cosker, Patrick | Jeweller | D 1842-1846 |
| M'Coy, George W. | Watchmaker | D 1837-1850 |
| M'Crea, Robert | Goldsmith | D 1785 |
| M'Culley, George H. | Watchmaker | D 1829-1850 |
| M'Cully, William | Watchmaker | D 1841, 1850 |
| M'Cutchen, Francis | Jeweller | D 1844-1846 |
| M'Daniel, John | Silversmith | D 1848-1849 |
| M'Daniel, William H. | Watchmaker | D 1825 |
| M'Dermott, Charles C. | Jeweller | D 1850 |
| M'Dermott, Edward | Jeweller | D 1848 |
| M'Dermott, James | Silverplater | D 1835 |
| M'Donald, Daniel | Silversmith | D 1828-1837 |
| M'Donald, Richard | Silverplater | D 1820-1824 |
| M'Donnel, see M'Donald | | |
| M'Donough, John | Goldsmith | 1775 |
| M'Donough, Patrick | Goldsmith | D 1811 |
| M'Dowell, James | Watchmaker | D 1794-1808 |
| M'Dowell, John | Clockmaker | D 1817 |
| M'Elwee, James | Watchmaker | D 1813-1814 |
| M'Elwee, see also Ferris & M'Elwee | | |
| M'Ewen, John | Silverplater | D 1830-1833 |
| M'Farlane, William | Watchmaker | D 1805 |
| M'Fee, John | Goldsmith | D 1797-1799, D. 1800 |
| M'Fee & Reeder | Goldsmiths | D 1793-1796 |
| M'Fee, M. | Silversmith | Adv. 1769 |
| M'Glensey, John | Jeweller | D 1845-1850 |
| M'Ilhenney, Joseph E. | Watchmaker | D 1818-1825 |
| M'Ilhenney & West | Watchmakers | D 1818-1822 |
| M'Ilvaine, John K. | Jeweller | D 1823-1837 |
| M'Ilwain, see M'Ilvaine | | |
| M'Intire, James | Silversmith | D 1840 |
| M'Keen, Henry | Watchmaker | D 1823-1850 |
| M'Keever, James | Jeweller | D 1829-1850 |
| M'Kinley, Edward | Watchmaker | D 1830-1837 |
| M'lean, Daniel J. | Watch Case Maker | D 1850 |
| M'lean, William S. | Jeweller | D 1845-1850 |
| M'Mahon, John | Silversmith | D 1803-1804 |
| M'Manus, John | Watchmaker | D 1840 |
| M'Master, John | Silversmith | D 1805 |
| M'Masters, Hugh A. | Watchmaker | D 1839-1850 |
| M'Minn, James | Jeweller | D 1846, 1850 |
| M'Mullen, Edward | Clockmaker | D 1846-1848 |
| M'Mullen, James | Goldsmith | D 1814 |
| M'Mullen, John | Silversmith | Census 1790, D 1795-1841 |
| M'Mullen, William | Silversmith | D 1791, 1794 |
| M'Mullen & Black | Silversmiths | D 1811-1813 |
| M'Namara | Watch Finisher | Adv. 1765 |
| M'Neare, William | Watch Case Maker | D 1828-1833 |
| M'Neir, William | Watch Case Maker | D 1835, 1844-1848 |
| M'Nutt, Ezra | Watchmaker | D 1848 |
| M'Pherson, John | Die Sinker | D 1846-1850 |
| M'Pherson, Robert | Silversmith | D 1828-1841, 1850 |
| M'Pherson, Robert | Watchmaker | D 1837-1850 |
| M'Stocker, Francis | Watchmaker | D 1831-1850 |
| Machon, Austin | Jeweller | Adv. 1759 |
| Mackey, John | Silversmith | D 1841-1842 |
| Maker, Matthew | Watch Finisher | Adv. 1761 |
| Maholland, Robert | Watchmaker | D 1850 |
| Mahony, William A. | Jeweller | D 1837-1841, 1848-1849 |
| Mahve, see Maker | | |
| Mander, Henry | Silversmith | D 1848-1850 |
| Manley, Matthew | Jeweller | D 1843 |
| Manly, James | Die Sinker | Adv. 1790 |
| Manning, John | Silverplater | D 1819-1822 |
| Mansfield, Samuel A. | Watchmaker | D 1848-1850 |
| Mansfield, Thomas | Silversmith | D 1804 |
| Mansure, John | Jeweller | D 1844-1850 |
| Manuel, Jules | Watchmaker | D 1849-1850 |
| Marce, see Maree | | |
| Marceloe, Isaac(Apprentice To Fr. Richardson) | Silversmith | Adv. 1735 |
| Maree, Henry | Jeweller | D 1845 |
| Maree, Henry S. | Jeweller | D 1848-1850 |
| Marks, Isaac | Dealer In Watches | D 1795-1799 |
| Marrs & Stewart | Silverplaters | D 1802 |
| Marrs, Robert | Silverplater | D 1803-1818 |
| Marshall | Jeweller | D 1833 |
| Marshall, Alexander D. | Jeweller | D 1847-1848 |
| Marshall, Joseph | Goldsmith | D 1818-1850 |
| Marshall & Smith | Jewellers | D 1837 |
| Marshall & Tempest | Goldsmiths | D 1813-1850 |
| Marshall, see also Spencer & Marshall | | |
| Martin | Jeweller | D 1811 |
| Martin, Ambrose | Jeweller | D 1840-1850 |
| Martin, Anthony, see St. Martin | | |
| Martin, John | Silverplater | D 1823-1824, 1829-1835 |
| Martin, John J. (or J. L.) | Clockmaker | D 1844-1850 |
| Martin, Lewis | Jeweller | D 1811 |
| Martin, Patrick | Watchmaker | D 1820-1822, 1831-1850 |
| Mascher, John F. | Watchmaker | D 1845-1850 |
| Mason, Charles A., see Masson | | |
| Mason, Samuel, Jr. | Watchmaker | D 1820-1830 |
| Massey, Charles R. | Watchmaker | D 1837-1839 |
| Masson, Charles A. | Jeweller | D 1829-1850 |
| Mathey, Lewis | Watchmaker | D 1797-1803 |
| Mathey, see also Brandt & Mathey | | |
| Mathieu, Peter | Silverplater | D 1837-1843 |
| Matlack, White | Clockmaker | Adv. 1777 |
| Matlack, White & William | Clockmakers | Adv. 1780 |
| Matlack, William | Watchmaker | D 1797 |
| Matlack, William | Silversmith | D 1828-1833 |
| Matthews, Peter | Silverplater | D 1845 |
| Matthias, Charles | Jeweller | D 1849 |
| Maull, John | Jeweller | D 1848-1849 |
| Maull, Joseph (or J. E.) | Silverplater | D 1830-1837 |
| Maull, see also Clausen & Maull | | |
| Maurice, Meyer | Jeweller | D 1849 |
| Maus, Frederick | Watchmaker | Adv. 1782, D 1785-1793 |
| Mautz, John | Watchmaker | D 1841 |
| Mawdsley, John | Watchmaker | D 1846-1847 |
| Maxwell, A. | Clockmaker | D 1805-1811 |
| May, Samuel (May & Clarke) | Watchmaker | Adv. 1765 |
| Mayer, Elias | Jeweller | D 1831-1833 |
| Maysenhaelder, Charles | Jeweller | D 1810-1825 |
| Mead, John O. | Silverplater | D 1850 |
| Mead, see also Filley, Mead & Cadwell | | |
| Mears, Charles | Watchmaker | D 1828-1835 |
| Mears, Lewis | Jeweller | D 1848 |
| Mears, Lewis J. | Jeweller | D 1839 |
| Mecke, John | Watchmaker | D 1837-1850 |
| Megear, Thomas J. | Watchmaker | D 1833-1850 |
| Megonegal, F. | Jeweller | D 1841-1842 |
| Megonegal, W. H. | Watchmaker | D 1844 |
| Menard, Stephen | Jeweller | D 1817 |
| Mendenhall, John | Silversmith | D 1841-1846 |
| Mends, Benjamin | Watchmaker | D 1796-1797 |
| Mends, James | Watchmaker | D 1795 |
| Mens, see Mends | | |
| Menzies, John | Watchmaker | D 1804-1850 |
| Menzies, John, Jr. | Watchmaker | D 1835-1850 |
| Merkle, Perry (or Parry) | Silverplater | D 1840-1848 |
| Merry, F. | Watchmaker | D 1799 |
| Mesker, see Mexter | | |
| Mestier, B. | Watchmaker | D 1817 |
| Mexter, Godfrey | Silverplater | D 1837-1840 |
| Meyers, Albert (or A. G.) | Silversmith | D 1837-1846 |
| Meyers, Elijah | Jeweller | D 1829-1830 |
| Meyers, John, see Myers, John | | |
| Meyrick, Richard | Engraver | Adv. 1729 |
| Mignard, Lewis | Jeweller | D 1829-1835 |
| Miles, John | Silversmith | D 1785-1796 |
| Miles, Robert | Silverplater | D 1828-1850 |
| Miley, John | Silverplater | D 1829-1850 |
| Milhe, Stephen | Goldsmith | D. 1798 |
| Millard, George | Silversmith | D 1816 |
| Miller, George | Watchmaker | 1809 |
| Miller, George | Watchmaker | D 1829-1833 |
| Miller, S. W. | Clockmaker | D 1843 |
| Miller, Thomas | Watchmaker | D 1819-1833, 1840,1841 |
| Miller, William | Jeweller | D 1810-1840, 1847 |
| Miller, William S. | Clockmaker | D 1844-1848 |
| Miller & Son | Silversmiths | D 1833-1835 |
| Miller, see also Ward & Miller | | |
| Milloudon, Phillippe | Goldsmith | D 1811 |
| Mills, Edmund | Goldsmith | D 1785 |
| Mills, Edward | Silversmith | D 1794 |
| Mills, John, see Miles, John | | |
| Mills, John | Silversmith | D 1811-1819 |
| Milne, Edmund | Goldsmith | Adv. 1757-1773, D. 1813 |
| Milne, Robert | Clockmaker | D1817 |
| Mindel, Gustavus | Watchmaker | D 1850 |
| Minshall, William | Jeweller | Adv. 1773 |
| Missing, Charles | Jeweller | D 1847 |
| Mitchell, Henry | Silversmith | D 1844-1850 |
| Mitchell, James | Silversmith | D 1845-1846 |
| Mix, Thomas | Silverplater | D 1803 |
| Moellinger, see Mollinger | | |
| Moffett, Benjamin | Jeweller | D 1839 |
| Mollinger, Henry | Watchmaker | D 1794, 1799, 1804 |
| Monfay, Benedict | Jeweller | D 1828-1835 |
| Monier, Daniel | Watchmaker | D 1825-1850 |
| Monteith, Benjamin | Watchmaker | D 1818 |
| Monteith, Charles | Clockmaker | D 1847-1848 |
| Monteith & Co. | Clockmakers | D 1845 |
| Monteith & Shippen | Watchmakers | D 1817 |
| Moollinger, see Mollinger | | |
| Moore, Charles | Silversmith | D 1803-1809 |
| Moore, Robert | Jeweller | D 1829-1840 |
| Moore, Thomas | Silversmith | D 1805 |
| Moore & Ferguson | Silversmith | D 1801 1-1805 |
| Moreland, Thomas F. | Silversmith | D 1850 |
| Morgan, Aaron | Jeweller | D 1842-1850 |
| Morgan, Arthur | Jeweller | D 1849 |
| Morgan, John, see Morin, John | | |
| Morgan, Thomas | Watchmaker | Adv. 1779-1782, D 1785-1793 |
| Morin, Alexander C. | Jeweller, Etc. | D 1813-1850 |
| Morin, Anthony | Chaser | D 1849-1850 |
| Morin, Augustus | Watchmaker | D 1835 |
| Morin, John | Goldsmith | D 1808-1831 |
| Mormagea, Michael | Goldsmith | D 1817 |
| Morozzi, Angelo | Jeweller | D 1839-1842 |
| Morris, James | Silverplater | D 1844 |
| Morris, John | Jeweller | D 1817,1842 |
| Morris, William | Watchmaker | D 1837-1850 |
| Morris, William, Jr. | Watchmaker | D 1844-1850 |
| Morrison, Israel | Silversmith | D 1823-1824 |
| Morrissey, C. R. | Watchmaker | D 1837 |
| Morrow, B. | Jeweller | D 1806-1808 |
| Morrow & Barnard | Jewellers | D 1805 |
| Morton, George | Silverplater | D 1829-1850 |
| Moses, Jacob | Jeweller | D 1820-1822 |
| Moton, George | Jeweller | D 1849-1850 |
| Mountain, Samuel P. | Watchmaker | D 1842 |
| Mountford, John | Importer Of Watches | D 1818-1819 |
| Mudge, M. A. | Jeweller | D 1837 |
| Mulen, see Mullin | | |
| Mulholland, William | Jeweller | D 1837-1844 |
| Mulhollen, William | Jeweller | D 1817-1818 |
| Mullin, William (or W. J.) | Jeweller | D 1829-1833 |
| Murdoch, John | Goldsmith | Adv. 1779, D 1785 |
| Murphy, James | Silversmith | D 1846 |
| Murphy, Robert (or R. E.) | Watchmaker | D 1848-1850 |
| Murray, Alexander | Chaser | D 1814-1816 |
| Murtel, Perry | Silverplater | D 1839 |
| Musgrave, James | Goldsmith | D 1795-1811 |
| Musgrave, see also Parry & Musgrave | | |
| Myers, Christalar | Jeweller | D 1844 |
| Myers, John(Apprentice To Richard Humphreys, 1773) | Goldsmith | D 1785-1804 |
| Myers & Jacob | Silversmiths | D 1839 |
| Myring, Joseph | Lapidary | D 1811-1825 |
| Mysendhender, see Maysenhaelder | | |
|