Josiah Bartlett was born 24 May 1701 in Marshfield, Plymouth County, Massachusetts to Ichabod Bartlett (1670-1715) and Elizabeth Waterman (1679-1708) and died 16 March 1782 Lebanon, New London County, Connecticut of unspecified causes. He married Mercy Chandler (1704-1781) 3 January 1722 in Duxbury, Plymouth County, Massachusetts.
Children
| Name | Birth | Death | Joined with |
| Ichabod Bartlett (1723-1798) | |||
| Elizabeth Bartlett (1724-1790) | |||
| Nathaniel Bartlett (1727-1798) | |||
| John Bartlett (1730-1795) | |||
| Chandler Bartlett (1733-1818) | |||
| Cyrus Bartlett (1738-1739) | |||
| Mercy Bartlett (1740-1827) | |||
| Mary Bartlett (1742-1819) | |||
| Rachel Bartlett (1745-) | |||
| Stephen Bartlett (1747-) | |||
Siblings
| Name | Birth | Death | Joined with |
| Josiah Bartlett (1701-1782) | 24 May 1701 Marshfield, Plymouth County, Massachusetts | 16 March 1782 Lebanon, New London County, Connecticut | Mercy Chandler (1704-1781) |
| Nathaniel Bartlett (1703-1732) | |||
| Joseph Bartlett (1706-1783) | |||
| Elizabeth Bartlett (1708-1755) | |||
| Name | Birth | Death | Joined with |
| Mercy Arnold Bartlett (1709-1755) | |||
| Sarah Arnold Bartlett (1710-1775) | |||
| Seth Bartlett (1713-) | |||