Susanna Pierce Hoar was born 9 May 1752 in Waltham, Middlesex County, Massachusetts to Abijah Pierce (1727-1800) and Thankful Brown (1730-1819) and died 9 January 1829 Lincoln, Middlesex County, Massachusetts of unspecified causes. She married Samuel Hoar (1743-1832) 1765 in Massachusetts.
Children
| Name | Birth | Death | Joined with |
| Abijah Hoar (1762-) | |||
| Nathaniel Hoar (1764-1820) | |||
| Susannah Hoar (1774-) | |||
| Thankful Hoar (1775-) | |||
| Samuel Hoar (1778-1856) | 18 May 1778 Lincoln, Middlesex County, Massachusetts, United States | 2 November 1856 Concord, Middlesex County, Massachusetts, United States | Sarah Sherman (1783-1866) |
| Elizabeth Hoar (1780-1811) | |||
| Abijah Hoar (1782-) | |||
| William Hoar (1786-) | |||
| John Hoar (1789-) | |||
| Polly Hoar (1791-1813) | |||
| Levina Hoar (1794-) | |||
Siblings
| Name | Birth | Death | Joined with |
| Susanna Peirce (1752-1829) | 9 May 1752 Waltham, Middlesex County, Massachusetts | 9 January 1829 Lincoln, Middlesex County, Massachusetts | Samuel Hoar (1743-1832) |
| Nathaniel Pierce (1754-1782) | |||