| Player | Birth date | First year in majors | Last year in majors | Played in majors | With StL-N | With minors | Drafted |
| Heaford McKinney | June 17, 1929 | 0 | 0 | No | No | Yes | 0 |
| Ian McKinney | November 18, 1994 | 0 | 0 | No | No | Yes | 2013 |
| Alex McKinnon | August 14, 1856 | 1884 | 1887 | Yes | Yes | No | 0 |
| James McKinnon | 1926 | 0 | 0 | No | No | Yes | 0 |
| Tom McKinnon | May 16, 1973 | 0 | 0 | No | No | Yes | 1991 |
| McKinnon | 0 | 0 | No | No | Yes | 0 | |
| Blake McKnight | February 13, 1991 | 0 | 0 | No | No | Yes | 2013 |
| Charles McKnight | 0 | 0 | No | No | Yes | 0 | |
| Jim McKnight | June 9, 1956 | 0 | 0 | No | No | Yes | 0 |
| Jim McKnight | June 1, 1936 | 1960 | 1962 | Yes | No | Yes | 0 |
| Jack McLain | March 29, 1920 | 0 | 0 | No | No | Yes | 0 |
| Bill McLaughlin | October 19, 1916 | 0 | 0 | No | No | Yes | 0 |
| Jim McLaughlin | January 3, 1902 | 1932 | 1932 | Yes | Yes | No | 0 |
| McLaughlin | 0 | 0 | No | No | Yes | 0 | |
| Ralph McLaurin | May 23, 1885 | 1908 | 1908 | Yes | Yes | No | 0 |
| Bully McLean | May 24, 1900 | 0 | 0 | No | No | Yes | 0 |
| Charles McLean | 1926 | 0 | 0 | No | No | Yes | 0 |
| Charlie McLean | February 21, 1914 | 0 | 0 | No | No | Yes | 0 |
| D. McLean | 0 | 0 | No | No | Yes | 0 | |
| Larry McLean | July 18, 1881 | 1901 | 1915 | Yes | Yes | No | 0 |