On May 24, 1785, Clarkson was married to Mary Rutherfurd (1761–1786), the daughter of
Walter Rutherfurd and Catherine (née Alexander) Rutherfurd and the sister of
U.S. Senator John Rutherfurd. Together they had eight children, including: • Elizabeth Clarkson (1793–1820), • Catherine Rutherfurd Clarkson (1794–1861), who married Jonathan Goodhue, son of
U.S. Senator Benjamin Goodhue. •
David Clarkson (1795–1867), who was
President of the New York Stock Exchange, from 1837 to 1851, who married his cousin, Elizabeth Streatfield Clarkson, in 1822. who married Catherine Elizabeth Clarkson in 1821. the rest of his interest was placed in trust for his children.
Descendants Through his eldest daughter Mary, he was the grandfather of:
John Clarkson Jay (1808–1891), a physician and noted
conchologist, Catherine Helena Jay (1815–1889), who married Henry Augustus DuBois (1808–1884), in 1835. who married Henry Evelyn Pierrepont (1808–1888), in 1841, who married another of his grandchildren, Matthew Clarkson (1823–1913), the son of David Clarkson, in 1852. ==References==