When David Crosby Jr was born on 6 September 1737, in Harwich, Barnstable, Plymouth Colony, British Colonial America, his father, David Crosby, was 28 and his mother, Reliance Hopkins, was 27. He married Bethiah Paddock about 1757, in New York, United States. They were the parents of at least 2 sons and 4 daughters. He lived in Dutchess, New York, United States in 1790 and Southeast, Dutchess, New York, United States for about 10 years. He died on 16 November 1816, in Putnam, New York, United States, at the age of 79, and was buried in Southeast, Putnam, New York, United States.