Joseph Gillett Jr. was born on 2 November 1664 at Windsor, Hartford County, Connecticut. He was the son of
Joseph Gillett and
Elizabeth Hawkes. Joseph Gillett Jr. married
Esther Gull on 3 November 1687 at Hatfield, Hampshire County, Massachusetts. Joseph Gillett Jr. married
Mary Griswold on 17 May 1692 at Hartford, Hartford County, Connecticut. Joseph Gillett Jr. died on 9 July 1745 at Hartford, Hartford County, Connecticut, at age 80. He died on 13 February 1746 at Hartford, Hartford County, Connecticut, at age 81.