William Lowell Putnam was born 22 November 1861 in Roxbury, Suffolk County, Massachusetts, United States to George Putnam (1834-1912) and Harriett Lowell (1836-1920) and died 26 July 1924 Cotuit Village, Barnstable, Barnstable County, Massachusetts, United States of unspecified causes. He married Elizabeth Lowell (1862-1935) 9 June 1888 in Brookline, Norfolk County, Massachusetts.
Children
| Name | Birth | Death | Joined with |
| George Putnam (1889-1960) | |||
| Katharine Lawrence Putnam (1890-1983) | 5 December 1890 Boston, Suffolk County, Massachusetts, United States | 6 June 1983 Boston, Suffolk County, Massachusetts, United States | Harvey Hollister Bundy (1888-1963) |
| Roger Lowell Putnam (1893-) | |||
| Marriett Lowell Putnam (1897-1900) | |||
| Augustus Lowell Putnam (1899-1947) | |||
Siblings
| Name | Birth | Death | Joined with |
| William Lowell Putnam (1861-1924) | 22 November 1861 Roxbury, Suffolk County, Massachusetts, United States | 26 July 1924 Cotuit Village, Barnstable, Barnstable County, Massachusetts, United States | Elizabeth Lowell (1862-1935) |
| Charles Russell Lowell Putnam (1869-1962) | |||
| James Lowell Putnam (1872-1936) | |||
| Elizabeth Putnam (1873-1967) | |||
| Josephine Putnam (1877-1965) | |||