| Kahmer, William | Silverplater | D 1843-1847, 1850 |
| Karbin, see Carbin | | |
| Karl, J. N. | Silverer | D 1810 |
| Karn, A. L. | Watchmaker | D 1809-1810 |
| Karner (or Karrar), C. | Watchmaker | D 1809-1811 |
| Kean, John W. | Jeweller | D 1837-1850 |
| Keating, see Warner & Keating | | |
| Keatting, Lambert, Jr. | Watch Case Maker | D 1831-1843 |
| Keel, John | Watchmaker | D 1835-1837 |
| Keiff, Joseph | Silversmith | D 1828-1833 |
| Keim, Alexander | Silversmith | D 1841-1850 |
| Keim, see also Butler & Keim | | |
| Keller, Charles | Jeweller | D 1841 |
| Keller, George | Silverplater | D 1846 |
| Kellinger, John V. | Silverplater | D 1837 |
| Kelley, David | Watchmaker | D 1806-1816 |
| Kelly, Robert | Jeweller | D 1843-1844 |
| Kennedy, Hugh | Watchmaker | D 1837-1850 |
| Kennedy, Nathan | Silversmith | D 1825 |
| Kennedy, Patrick | Watchmaker | D 1795-1801 |
| Kensell, William | Silverplater | D 1835 |
| Kerrison, Robert M. | Watchmaker | D 1842-1850 |
| Kessler, John, Jr. | Watchmaker | D 1806-1807 |
| Kew, George | Watchmaker | D 1840 |
| Key, F. C. | Die Sinker | D 1848 |
| Key & Sons | Die Sinkers | D 1850 |
| Keyser, Joseph | Watchmaker | D 1828-1833 |
| Keyser, William | Silversmith | 1850 |
| King, John | Silverplater | D 1817-1819 |
| King, William | Silverplater | D 1806-1816 |
| Kinkead, James | Clockmaker | Adv. 1765 |
| Kinley, A. | Silversmith | D 1841 |
| Kinsel, William & Jesse | Silverplaters | D 1837-1839 |
| Kirchoff, J. H. | Clockmaker | D 1805 |
| Kirckhaff, E. H. | Clockmaker | D 1803 |
| Kirk, Joshua | Silverplater | D 1848-1849 |
| Kirk, Robert | Jeweller | D 1829-1833 |
| Kitchen, Andrew (or A. E.) | Jeweller | D 1835-1837 |
| Kitchen, see also Bailey & Kitchen | | |
| Klein, John | Watchmaker | D 1828-1850 |
| Kleiser (or Kleizer), Jacob | Clockmaker | D 1822-1824 |
| Kline, Bartholomew | Jeweller | D 1837-1850 |
| Kline, B. & Co. | Silversmiths | D 1837 |
| Kline, Charles, see Cline, Charles | | |
| Kline, John, see Klein, John | | |
| Kline, Peter | Silverplater | D 1835 |
| Kline, Philip, see Cline | | |
| Klingle, Joseph | Watchmaker | D 1823-1825 |
| Knappe, Philip | Jeweller | D 1839-1841 |
| Kneass, Christian | Silverplater | D 1811-1837 |
| Kneass, William | Engraver | D 1805-1842 |
| Kneass, see also Horn & Kneass | | |
| Knipe, Philip | Jeweller | D 1829-1833 |
| Knock, Julius | Die Sinker & Chaser | D 1845-1850 |
| Knorr, James | Jeweller | D 1828-1829 |
| Knorr & Baker | Jewellers | D 1830 |
| Knowles, John | Watchmaker | Adv. 1784 |
| Koch, Augustus | Jeweller | D 1850 |
| Koch, Carl | Jeweller | D 1846-1848 |
| Kocksperger, Henry | Watchmaker | D 1837 |
| Kolb, Peter | Silverplater | D 1829-1833, 1839, 1845-1850 |
| Kolby, John | Silverplater | D 1807-1808 |
| Kramer, William | Silverplater | D 1848 |
| Kucher, Jacob | Silversmith | D 1806-1817, 1825-1833 |
| Kurtz, John | Silverplater | D 1823-1824 |
|