Eliza G. Washburn (maiden name: Gardner) was born on November 23, 1827, in Canton, Massachusetts, to James and Marcia Gardner. She married Andrew Washburn on May 17, 1854, and their son Gardner was born around 1858. They lived in Medway, Massachusetts, and her husband worked as a teacher. They moved to Boston, Massachusetts, in the late 1850s, and by 1860, they owned $4,500 of real estate and $1,000 of personal property.
In the 1860s, they moved to Medway, Massachusetts, and then to Richmond, Virginia. By 1870, they owned $5,000 of real estate and $17,000 of personal property. They moved to Hyde Park, Massachusetts, in the 1870s, and her husband worked as an oil dealer there. They employed at least one white domestic servant. Her husband died in 1908, and by 1910, she was living in her son’s household in Brookline, Massachusetts. She died of senility in Hebron, New Hampshire, on August 18, 1910.