When William Reynolds was born on 18 January 1751, in Greenwich, Fairfield, Connecticut, United States, his father, James Sackett Reynolds, was 50 and his mother, Phebe Fowler, was 41. He married Rhoda about 1771. They were the parents of at least 1 son. He lived in Washington, New York, United States in 1810. He died on 24 November 1813, in Smithfield, Amenia, Dutchess, New York, United States, at the age of 62, and was buried in Smithfield Cemetery, Smithfield, Amenia, Dutchess, New York, United States.