When Thomas Jewett was born on 1 May 1794, in Wardsboro, Windham, Vermont, United States, his father, Thomas Jewett, was 37 and his mother, Melatiah Woodcock, was 26. He married Sylvia Haradon in March 1822, in Painted Post, Erwin, Steuben, New York, United States. They were the parents of at least 3 sons and 4 daughters. He lived in Hornby, Steuben, New York, United States in 1860. He died on 22 May 1873, in Hornby, Hornby, Steuben, New York, United States, at the age of 79, and was buried in West Hill Cemetery, Hornby, Steuben, New York, United States.