| RefNo | Title | Date |
| EC/1855/02 | Farr, William: certificate of election to the Royal Society | |
| RR/8/222 | Referee's report by William Newmarch, on a paper 'English reproduction table' by William Farr | 24 February 1880 |
| RR/8/223 | Referee's report by Charles Watkins Merrifield, on a paper 'English reproduction table' by William Farr | 25 February 1880 |
| RR/4/91 | Referee's report by Arthur Cayley, on a paper 'On the construction of life-tables, illustrated by a new life-table of the healthy districts of England' by William Farr | 4 May 1859 |
| RR/4/94 | Referee's report by John William Lubbock, on a paper 'On the construction of life-tables, illustrated by a new life-table of the healthy districts of England' by William Farr | 9 May 1859 |
| RR/4/93 | Referee's report by Campbell Greig De Morgan, on a paper 'On the construction of life-tables, illustrated by a new life-table of the healthy districts of England' by William Farr | 22 August 1859 |
| MC/7/149 | Letter from W Farr, General Register Office, Somerset House, to the Royal Society | 2 December 1864 |
| MC/7 | Volume 7 of miscellaneous correspondence regarding business matters, sent to the Royal Society | 1864-1866 |
| MC/11/36 | Letter from W [William] Farr, General Register Office, to [Thomas Henry] Huxley, [Secretary of the Royal Society] | 28 March 1877 |
| MC/11/5 | Letter from W [William] Farr, General Register Office, to [Joseph Dalton] Hooker, [President of the Royal Society] | 17 January 1877 |
| MC/12/274 | Letter from W [William] Farr, 78 Portsdown Road, to the Royal Society | 3 October 1882 |
| MC/11 | Volume 11 of miscellaneous correspondence regarding business matters, sent to the Royal Society | 1877-1879 |
| MS/427/217 | Copy letter from Walter White, Assistant Secretary of the Royal Society; to Miss Farr | 19 September 1882 |
| MC/12 | Volume 12 of miscellaneous correspondence regarding business matters, sent to the Royal Society | 1880-1883 |
| AP/59/4 | Unpublished paper, 'On the minute structure and relationships of the lymphatics of the skin, and on the ultimate distribution of nerves to the epidermis, and subepidermic lymphatics' by George Hoggan and Frances Elizabeth Hoggan | 1877 |
| AP/59/4/1 | Unpublished manuscript, 'On the minute structure and relationships of the lymphatics of the skin, and on the ultimate distribution of nerves to the epidermis, and subepidermic lymphatics' by George Hoggan and Frances Elizabeth Hoggan | 1877 |
| RR/4/111 | Referee's report by William Farr, on a paper 'A supplement to two papers published in the Transactions of the Royal Society, "On the science connected with human mortality;" the one published in 1820, and the other in 1825' by Benjamin Gompertz | 2 December 1861 |