Sarah Colby Bagley was born circa 1635 in Cambridge, Middlesex County, Massachusetts to Anthony Colby (1605-1660) and Susannah Haddon (1610-1689) and died after 1721 of unspecified causes. She married Orlando Bagley (1623-1663) 1653 .
Siblings
| Name | Birth | Death | Joined with |
| John Colby (1633-1674) | 9 August 1633 Boston, Suffolk County, Massachusetts | 11 February 1674 Amesbury, Essex County, Massachusetts | Frances Hoyt (1636-1720) |
| Sarah Colby (1635-aft1721) | 1635 Cambridge, Middlesex County, Massachusetts | 1721 | Orlando Bagley (1623-1663) |
| Child Colby (1636-1636) | |||
| Samuel Colby (1638-1716) | 10 August 1638 Salisbury, Essex County, Massachusetts | 1716 Amesbury, Essex County, Massachusetts | Elizabeth Sargent (1648-1736) |
| Isaac Colby (1640-1682) | 6 July 1640 Salisbury, Essex County, Massachusetts | 1684 Amesbury, Essex County, Massachusetts | Martha Parratt (1649-1730) |
| Rebecca Colby (1643-) | |||
| Mary Colby (1647-1716) | 19 September 1647 Salisbury, Essex County, Massachusetts | 27 September 1716 Amesbury, Essex County, Massachusetts | William Sargent (1645-1712) |
| Thomas Colby (1651-) | |||