On 30 Jun 1771 William married Mary Sprague (44564) , daughter of James Sprague (25159) (19 Mar 1715-1759) & Patience Ford (34635) (1 Jan 1723-7 Apr 1800), in Marshfield, MA. Born 22 Jan 1746/7 in Marshfield, MA. Mary died in Waldoboro, Lincoln County, Maine on 1 Apr 1800.