| Results | |||
| Note: A ? indicates the information presented is a 'best guess'. The information on the original letter is unknown or illegible and may not be completely accurate. | |||
| Letter Number | Letter Date | Written By | Written To |
| 2119 | 1849 January 22 | Mark Hopkins Sibley | Hiram Sibley |
| 2120 | 1850 January 25 | Mark Hopkins Sibley | Hiram Sibley |
| 2121 | 1850 February 11 | Mark Hopkins Sibley | Hiram Sibley |
| 2122 | 1850 March 04 | Mark Hopkins Sibley | Hiram Sibley |
| 2123 | 1848 March 25 | Mark Hopkins Sibley | Hiram Sibley |
| 2124 | 1850 March 27 | Mark Hopkins Sibley | Hiram Sibley |
| 2125 | 1843 May 14 | Mark Hopkins Sibley | Hiram Sibley |
| 2126 | 1852 August 06 | Mark Hopkins Sibley | Hiram Sibley |
| 2127 | 1848 September 08 | Mark Hopkins Sibley | Hiram Sibley |
| 2128 | 1850 October 28 | Mark Hopkins Sibley | Hiram Sibley |
| 2129 | 1850 November 22 | Mark Hopkins Sibley | Hiram Sibley |
| 2130 | 1851 December 20 | Mark Hopkins Sibley | Hiram Sibley |
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