Mercy Bradford Vermayes was born circa 1627 in Plymouth Colony, Plymouth, Plymouth County, Massachusetts to William Bradford (1590-1657) and Alice Carpenter (1583-1670) and died after 1648 Plymouth, Plymouth County, Massachusetts of unspecified causes. She married Benjamin Vermayes (c1620-) 21 December 1648 in Plymouth, Plymouth County, Massachusetts.
Mercy Bradford was born before May 22, 1627 at Plymouth Colony and may have been dead before her father's 1657 will as she was not mentioned. She married Benjamin Vermayes on December 21, 1648 in Plymouth but had no known children.
Siblings
| Name | Birth | Death | Joined with |
| John Bradford (1615-1678) | 1618 Leiden, Zuid-Holland, Netherlands | 21 September 1676 Norwich, New London County, Connecticut, United States | Martha Bourne (1614-) |
| Name | Birth | Death | Joined with |
| William Bradford (1624-1704) | 17 June 1624 Plymouth Colony, Plymouth, Plymouth County, Massachusetts, United States | 20 February 1704 Plymouth, Plymouth County, Massachusetts, United States | Alice Richards (1629-1671) Mary Fitch (c1635-1675) Mary Atwood (1642-1715) |
| Mercy Bradford (1630-) | 1627 Plymouth Colony, Plymouth, Plymouth County, Massachusetts | 1648 Plymouth, Plymouth County, Massachusetts | Benjamin Vermayes (c1620-) |
| Joseph Bradford (1630-1714) | 1630 Plymouth Colony, Plymouth, Plymouth County, Massachusetts | 10 July 1715 Kingston, Plymouth County, Massachusetts | Jael Hobart (1643-1730) |