| La Blanc, Augustus | Jeweller | D 1819 |
| Lacey, John | Watchmaker | D 1819-1825 |
| Lackey, Henry | Clockmaker | D 1808-1811 |
| Ladomus, Jacob | Watchmaker | D 1843-1850 |
| Ladomus, Lewis | Watchmaker | D 1845-1850 |
| Lagazze, John, & Joseph Sonnier | Jewellers | D 1814-1816 |
| Lalande, John | Jeweller | D 1844-1850 |
| Lalarde, see Lalande | | |
| Lamar, see Lemaire | | |
| Lambers, E. J. | Gold & Silversmith | D 1821 |
| Lamesiere, Peter | Goldsmith | 1811 |
| Lamione, A. see Lemoine | | |
| Lammel, Lewis | Chaser | D 1843-1850 |
| Lamont, Robert | Silversmith | D 1842-1845 |
| Lamont, see also Bard & Lamont | | |
| Lamoyne, Augustus | Watchmaker | D 1816 |
| Lamvine (or Lemvine), Augustus | Watchmaker | D 1811-1816 |
| Lancaster, Americus | Jeweller | D 1842-1850 |
| Lancaster, Arman | Jeweller | D 1837 |
| Lancaster, M. | Jeweller | D 1839 |
| Lancaster, Richard | Jeweller | D 1818-1822 |
| Lancaster, see also Rickards & Lancaster | |
| Lane, James | Watchmaker | D 1803-1818 |
| Lang, Abraham | Jeweller | D 1850 |
| Lang, Lewis | Jeweller | D 1844 |
| Lang, Lewis W. | Jeweller | D 1837 |
| Langer, Joseph | Goldsmith | D 1811 |
| Laquain, Francis | Watchmaker | D 1794 |
| Larer, Alexander (or A. E.) | Jeweller | D 1846-1850 |
| Laret, Michael | Jeweller | D 1814, 1818 |
| Laret & Brechemin | Jewellers | D 1816-1818 |
| Larit, see Laret | | |
| La Rue, William | Silverplater | D 1847-1849 |
| Latimer, James | Watchmaker | D 1813-1822 |
| Latta, A. | Watchmaker | D 1837 |
| Laval, George | Silverplater | D 1842-1843 |
| Laval, Peter | Silverplater | D 1842 |
| Law, William | Jeweller | D 1837-1850 |
| Law, William | Watchmaker | D 1839-1841 |
| Law, William P. | Jeweller | D 1848-1850 |
| Lawrence | Silversmith | D 1835 |
| Lawrence, John | Watchmaker | d. 1798 |
| Lawrence, Joseph | Jeweller | D 1818-1822 |
| Lawrence, Joseph | Silverplater | D 1839-1850 |
| Lawrence, Joseph H. | Jeweller | D 1823-1825 |
| Lawrence, Josiah | Silversmith | D 1817, 1837 |
| Lawrie, Robert (or R. D.) | Silversmith | D 1840-1850 |
| Lawrie, see also Taylor & Lawrie | | |
| Laws, John | Silverplater | D 1818-1830 |
| Lawson, Alexander | Engraver | 1794, D 1799 |
| Lazarus, Moses | Jeweller | D 1830 |
| Leach, Samuel | Engraver | Adv. 1741 |
| Leacock, John | Goldsmith | Adv. 1751-1767, 1799 |
| Le Blanc, Lewis | Goldsmith | D 1818 |
| Le Dorc | Silversmith | D 1797 |
| Lee, George | Jeweller | D 1837-1850 |
| Leeds, Gideon H. | Watchmaker | D 1841-1842 |
| Leeds, Howard G. | Watchmaker | D 1840 |
| Leevell, Peter | Silverplater | D 1841 |
| Lefevre, F. | Silversmith | D 1818 |
| Lefevre, John Felix | Silversmith | D 1806-1813, d. 1813 |
| Lefevre & Gravelle | Gold & Silversmiths | D 1811 |
| Lefevre, Theodore | Silver Chaser | D 1820-1822 |
| Lefferts, Charles | Watchmaker | D 1818-1822 |
| Lefferts & Hall | Watchmakers | D 1818-1822 |
| Le Huray, Nicholas | Watchmaker | D 1809-1831 |
| Le Huray, Nicholas, Jr. (or N. J.) | Watchmaker | D 1821-1846 |
| Le Huray, Theodore | Jeweller | D 1843-1850 |
| Leland, Joseph | Jeweller | D 1846 |
| Lelurge, Joseph | Jeweller | D 1817-1822 |
| Lemaire, Baptiste | Silversmith | D 1804 |
| Lemaire, Benjamin | Goldsmith | D 1785 |
| Lemaire, Matthias | Silversmith | Census 1790, D 1794-1803 |
| Lemar, see Lemaire | | |
| Le Merre, Matthew | Silversmith | Adv. 1781 |
| Lemist, William & Tappon, W. B. | Watchmakers | D 1816-1819 |
| Lemoine, A. | Watchmaker | D 1810-1817 |
| Lemvine, see Lamvine | | |
| Lendner, see Lindner | | |
| Lenoir, William | Jeweller | D 1843-1850 |
| Lenon, see Lenoir | | |
| Lentner, see Lindner | | |
| Lentz, George K. | Watchmaker | D 1825 |
| Leonard, Allen | Die Sinker | D 1844-1850 |
| Leonard & Wilson | Silversmiths | D 1847-1856 |
| Le Page, Alexander | Silver Founder | D 1818 |
| Lescure, Edward (or E. P.) | Silversmith | D 1822-1850 |
| Leslie, Robert | Watchmaker | Adv. 1788, D 1791, 1795, 1803, d. 1804 |
| Leslie & Parry | Watchmakers | D 1803 |
| Leslie & Price | Watchmakers | D 1793-1800 |
| Le Telier, John | Goldsmith | Adv. 1770-1780, D 1793 |
| Levering, Lewis | Silverplater | D 1835 |
| Levi, Garretson | Watchmaker | D 1840-1843 |
| Levi, Isaac | Watchmaker | Adv. 1780 |
| Levis, William | Silversmith | D 1810-1814 |
| Levy, Henry (or H. A.) | Watchmaker | D 1841-1850 |
| Levy, Lewis B. | Watchmaker | D 1841-1845 |
| Levy, Martin | Watch Case Maker | D 1814-1817 |
| Levy, Michael | Watchmaker | D 1802-1816 |
| Levy, M., & Co. | Clockmakers | D 1816-1817 |
| Lewis | Watchmaker | D 1796 |
| Lewis, Harvey | Silversmith | D 1811-1825 |
| Lewis, John (or John M.) | Watchmaker & Jeweller | D 1830-1850 |
| Lewis & Smith | Silversmiths | D 1805-1811 |
| Lewis, see also Brandt, Brown & Lewis, Johnson & Lewis | |
| Lhulier, Cassimer (or Cashmere) | Jeweller | D 1825-1850 |
| Lhulier, Lewis | Jeweller | D 1829-1849 |
| Lhulier & Co. | Jewellers | D 1846 |
| Limeburner, John | Watchmaker | Census 1790, D 1791 |
| Limone, see Lemoine | | |
| Lind, John | Watchmaker | Adv. 1775, Census 1790, D 1791, 1794, 1799-1801, 1805 |
| Lindner (or Linder), George | Silversmith | D 1837-1850 |
| Lindsey, Thomas | Watchmaker | Adv. 1799 |
| Linerd, John | Watchmaker | D 1816 |
| Link, Peter | Goldsmith | D 1811, 1817-1822 |
| Linn, see Lind | | |
| Lisset | Silverplater | D 1819 |
| List, John | Jeweller | D 1837-1850 |
| List & Smith | Jewellers | D 1847 |
| List & Smith, see also Smith & List | | |
| Little, Archibald | Watchmaker | D 1840 |
| Little, Thomas | Silverplater | D 1831 |
| Little, William | Silverplater | D 1813-1819 |
| Locton, Laetitia | Silver Burnisher | D 1811 |
| Loew, John J. | Watchmaker | D 1846-1848 |
| Lofland, Purnel | Silversmith | d. 1825 |
| Logan, James (servant to Milne) | Silversmith | Adv. 1769 |
| Lohse & Kayser | Importers of Watches | D 1831-1835 |
| Long, Andrew (or A. K.) | Silversmith | D 1837-1844 |
| Long, George W, | Jeweller | D 1837-1850 |
| Long, Samuel (or S. R.) | Watchmaker | D 1842-1846 |
| Long, William | Silversmith | D 1807-1822 |
| Lorange, John | Silverplater | D 1837-1850 |
| Lord, Joseph | Silversmith | Adv., d. 1795 |
| Lormger, Lorronge, Lorronger, see Lorange | |
| Lotier, Benjamin C. | Silversmith | D 1846-1847 |
| Louderback, Benjamin | Jeweller | D 1830-1845 |
| Loughlin, George | Jeweller | D 1849-1850 |
| Loughlin, Lawrence | Jeweller | D 1848 |
| Louiset, A. D. | Jeweller | D 1816-1817 |
| Lovell, A. E. | Clockmaker | D 1844-1849 |
| Lovell, Peter | Silverplater | D 1837 |
| Lovell & Smith | Clockmakers | D 1841-1843 |
| Lovett, Robert | Engraver | D 1818-1824 |
| Lovett, Robert, Jr. | Engraver | D 1840-1850 |
| Low, Joseph J. | Jeweller | D 1843-1850 |
| Low, Mark | Watch Case Maker | D 1847-1850 |
| Lowens, see Lownes | | |
| Lower, Isaac | Silversmith | D 1844-1846 |
| Lower, Jacob | Silversmith | D 1833-1850 |
| Lower, Joseph | Silversmith | D 1806-1850 |
| Lower, Theodore O. | Jeweller | D 1844 |
| Lower, William | Silversmith | D 1837-1848 |
| Lownes, Caleb | Die Sinker | Adv. 1779 |
| Lownes, David | Watchmaker | D 1785, 1800-1807, d. 1810 |
| Lownes, Edward | Silversmith | D 1817-1833 |
| Lownes, Joseph | Silversmith | 1754, Adv. 1780-1792, D 1785-1816 |
| Lownes, Joseph & Josiah H. | Silversmiths | D 1816-1822 |
| Lownes, Josiah H. | Silversmith | D 1820-1822, d. 1822 |
| Lownes & Erwin | Silversmiths | D 1816 |
| Lowrie, R. B. | Silversmith | D 1847-1849 |
| Lucke, John P. | Watchmaker | D 1849 |
| Ludwig, John | Watchmaker | Census 1790, D 1791 |
| Luhlier, see Lhulier | | |
| Lukens, Isaiah | Clockmaker | D 1823-1831 |
| Lukens, J. | Clockmaker | D 1837 |
| Lukens, William | Jeweller | D 1847 |
| Lunier, see Lhulier | | |
| Lyburn, John | Silverplater | D 1820-1822 |
| Lycett, John | Silverplater | D 1818-1822 |
| Lyndall, William | Watchmaker | D 1844 |
| Lyng, Philip | Goldsmith | D 1785, Adv. 1778 |
|