William Duncan was born on 12 May 1782 at Middlesex County, New Jersey. He was the son of
John Duncan and
Anna Dey. William Duncan married
Elizabeth Chamberlain on 16 April 1802 at Hightstown, Mercer County, New Jersey. William Duncan and
Elizabeth Chamberlain resided at at Sodus, Wayne County, New York, in 1804.
William Duncan appeared on the census of 1810; They are listed with five female children under ten years of age. He and
Elizabeth Chamberlain resided at at Rochester, Monroe County, New York, in 1823. William Duncan died on 5 November 1840 at Rochester, Monroe County, New York, at age 58. He was buried after 5 November 1840 at Mt. Hope Cemetery, Rochester, Monroe County, New York.