Mathias St. John was born 7 May 1604 in London, Middlesex, England, United Kingdom (St. Botolph's Bishopgate) to Oliver St. John (1575-1626) and Sarah Bulkeley (1580-1611) and died 19 October 1669 Norwalk, Fairfield County, Connecticut, United States of unspecified causes. He married Mary Tinker (1606-1669) 1 November 1627 in New Windsor, Bershire, England, United Kingdom.
Children
| Name | Birth | Death | Joined with |
| Mathias St. John (c1628-1728) | |||
| Thomas St. John (1631-1639) | |||
| Mark St. John (1633-1693) | 1633 United Kingdom | 12 August 1693 Darien, Fairfield County, Connecticut, United States | Elizabeth Stanley (c1635-c1692) |
| Mercy St. John (c1642-c1694) | |||
Siblings