Joseph Coit was born 20 July 1643 in Salem, Essex County, Massachusetts, United States to John Coit (c1592-1659) and Mary Jenners (1596-1676) and died 27 March 1704 New London, New London County, Connecticut, United States of unspecified causes. He married Martha Harris (c1642-1713) 18 July 1667 in New London, New London County, Connecticut, United States.
Children
| Name | Birth | Death | Joined with |
| John Coit (1670-1744) | 1 December 1670 New London, New London County, Connecticut, United States | 22 October 1744 New London, New London County, Connecticut, United States | Mehitable Chandler (1673-1758) |
| Joseph Coit (1672-1750) | 6 April 1672 New London, New London County, Connecticut, United States | 1 July 1750 Plainfield, Windham County, Connecticut, United States | Experience Wheeler (1685-1759) |
| William Coit (1675-1703) | |||
| Solomon Coit (1679-1753) | |||
| Daniel Coit (1677-) | |||
Siblings
| Name | Birth | Death | Joined with |
| Joseph Coit (1622-1622) | |||
| Abigail Coit (1626-) | |||
| John Coit (1630-1667) | 1630 England, United Kingdom | 3 October 1667 Gloucester, Essex County, Massachusetts, United States | Mary Stevens (-1692) |
| Hugh Coit (1637-1692) | |||
| Joseph Coit (1639-1704) | 20 July 1643 Salem, Essex County, Massachusetts, United States | 27 March 1704 New London, New London County, Connecticut, United States | Martha Harris (c1642-1713) |
| Mary Coit (1642-) | |||
| Martha Coit (1643-1730) | |||