On 31 Dec 1751 when Mary was 31, she first married Benjamin Muzzy in Newbury, MA.

On 4 Aug 1770 when Mary was 49, she second married Stephen Knight (27866) , son of Benjamin Knight (11481) (21 Aug 1668-bef 2 May 1737) & Abigail Jaques (11782) (11 Mar 1672/3-bef 24 Jan 1763), in Newburyport, MA. Born on 22 Mar 1707 in Newbury, MA. Stephen died in Newburyport, MA, on 1 Apr 1776; he was 69.

On 17 Sep 1777 when Mary was 57, she third married Joseph Crouch in Newburyport, MA.

On 27 Jan 1791 when Mary was 70, she fourth married Joseph Atkinson (46439) , son of Nathaniel Atkinson (20 Nov 1677-aft 1749) & Deborah Knight (27844) (26 Apr 1684-), in Boscawen, Merrimack County, New Hampshire. Born on 28 Nov 1718 in Newbury, MA.136