| Jacks, James | Jeweller | Adv. 1797, D 1799 |
| Jacks, William | Jeweller | D 1798-1800 |
| Jackson, Ephraim | Silverplater | D 1813-1817 |
| Jackson, Thomas | Chaser & Die Sinker | D 1837-1849 |
| Jacob, Celestin | Importer of Watches | D 1840 |
| Jacobs, George (or G. W.) | Jeweller | D 1839-1846 |
| Jacob, Moses | Jeweller (Indented Servant) | 1775 |
| Jacot, Henry (or H. W.) | Jeweller | D 1841-1850 |
| Jacqt, Julius | Watch Case Maker | D 1848-1850 |
| Jacot, see also Bonsall & Jacot | | |
| James, Jacob S. | Jeweller | D 1837 |
| Jardella, see Dubosq. & Jardella | | |
| Jeanes, Thomas | Watchmaker | D 1835-1837 |
| Jeangu, John | Jeweller | D 1804 |
| Jeanneret, Theophilus H. | Watchmaker | D 1818 |
| Jeannert see Sleeper & Jeannert | | |
| Jefferies, David (or D. H.) | Jeweller | D 1846-1850 |
| Jefferies, E. | Jeweller | D 1837-1839 |
| Jeffreys, Samuel | Watchmaker | Adv. 1771-1778 |
| Jenkins, Edward J. | Jeweller | D 1843-1850 |
| Jenkins, James | Silversmith | D 1794 |
| Jenkins, John | Goldsmith | Adv. 1777, D 1791-1793, 1796 |
| Jenkins, John | Jeweller | D 1844-1848 |
| Jenner, B. | Galvanic Plater | D 1846 |
| Jennings, Thomas | Silverplater | D 1837 |
| Jerome, Chauncey | Clockmaker | D 1846-1849 |
| Job, John | Watchmaker | D 1819 |
| Johnson (or Johnston), Robert | Watchmaker | D 1823-1825, 1831-1850 |
| Johnson, William E. | Jeweller | D 1841 |
| Johnson & Crowley | Watchmakers | D 1830-1833 |
| Johnson & Lewis | Watchmakers | D 1837-1842 |
| Jolineth, John | Jeweller | D 1841-1843 |
| Jolivet, John | Jeweller | D 1829-1833, 1844-1850 |
| Jonas, Joseph | Watchmaker | D 1817 |
| Jones, George W. | Silverplater | D 1840-1841 |
| Jones, James | Silversmith | d. 1815 |
| Jones, John | Goldsmith | d. 1768 |
| Jones, John | Watchmaker | Adv. 1772 |
| Jones, Levi | Silverplater | D 1845-1846 |
| Jones, Samuel S. | Jeweller | D 1844 |
| Jones, William G. | Silverplater | D 1837 |
| Joubert, Peter | Goldsmith | D 1807-1830 |
| Jourdan, Peter | Goldsmith | D 1823-1824 |
| Journot, Michael | Jeweller | D 1809-1810 |
| Joyce, Thomas (or T. F.) | Watchmaker | D 1820-1825 |
| Jubart see Joubert | | |
| Julian, Cadmus | Jeweller | D 1840 |
| Justice, Joseph (or J. J.) | Watchmaker | D 1844-1848 |
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