John Mangum was born 5 May 1736 in Albemarle County, Virginia to William Mangum (1706-1744) and Mary Persons (1709-) and died 1794 Newberry, South Carolina of unspecified causes. He married Mary Lewis (1734-) 1755 in Albemarle County, Virginia.
Children
| Name | Birth | Death | Joined with |
| William Mangum (1756-1837) | |||
| Lucy Mangum (1758-) | |||
| Sarah Mangum (1760-) | |||
| John Mangum (1763-1843) | 19 January 1763 Lunenburg, Virginia | 3 March 1843 Fulton, Itawamba County, Mississippi | Rebecca Canida (1785-1847) |
| Lewis Mangum (1767-) | |||
| Mary Mangum (1769-) | |||
Siblings
| Name | Birth | Death | Joined with |
| James Mangum (1734-1757) | |||
| John Mangum (1732-1794) | 5 May 1736 Albemarle County, Virginia | 1794 Newberry, South Carolina | Mary Lewis (1734-) |
| William Mangum (1736-1818) | |||
| Henry Mangum (1738-) | |||
| Arthur Mangum (1741-1789) | |||
| Sarah Mangum (1743-) | |||
| Solomon Mangum (1758-1810) | |||