On 17 Apr 1718 when John was 20, he married Margaret Gooding.
Children of John and Margaret (Gooding) Williams, born at Groton:
i. John Williams, b. 15 Feb 1719, d. 4 Nov 1752 at Arlington, m. 5 May 1741 Elizabeth Cutter (b. 26 Jan 1718 at Charlestown, d. 4 Nov 1752 at Arlington, dau. of Nathaniel & Elizabeth Cutter);
ii. William Williams, b. Dec 1723;
iii. Margaret Williams, b. 19 May 1726;
iv. Anne Williams, b. 20 Oct 1728;
v. Sarah Williams, b. 10 Sep 1731;
vi. Mary Williams, b. 7 Dec 1733; and
vii. Elizabeth Williams, b. 23 Sep 1736.