On 14 Mar 1759 when Elijah was 21, he married Elizabeth Damon (45577) , daughter of Dr. Edward Damon (26541) (Sep 1706-15 Mar 1800/1) & Elizabeth Smith (7 Dec 1720-12 Dec 1804), in Ware, MA. Born on 2 Oct 1741 in Wakefield, MA. Elizabeth died in New Braintree, MA, on 15 May 1822; she was 80.

Children of Elijah and Elizabeth (Damon) Marsh, born at Ware:
    i. Mary Marsh, b. Feb 1761;
    ii. Silas Marsh, b. Mar 1763; and
    iii. Lucy Marsh, b. Oct 1765.

Children of Oliver and Elizabeth (Damon) (Marsh) Newton, born at Ware:
    i. Elizabeth Newton, b. 10 Apr 1772;
    ii. stilborn son, b. &. d. 26 Apr 1774;
    iii. Electa Newton, b. 8 Sep 1775;
    iv. Sally Newton, b. 18 Oct 1777, d. 15 Dec 1793 at Ware;
    v. Oliver Newton, b. 26 Nov 1779; and
    vi. Nancy Newton, b. 30 Apr 1782.