Ca 1739 Thomas married Mary Hill, daughter of Samuel Hill (13 Nov 1696-2 Apr 1767) & Sarah Thompson (ca 1685-). Born 15 Feb 1718/9 in Durham, Strafford County, New Hampshire. Mary died in Durham, Strafford County, New Hampshire in 1810.

Children of Thomas and Mary (Hill) Chesley, born at Durham:
    i. Joseph Chesley, b. 4 May 1740, d. 29 Dec 1822, m. at Durham 15 Apr 1771 Susan Hogdon;
    ii. Abigail Chesley, b. ca. 1741, d. 1784, m. ca. 1763 James Thomas;
    iii. Benjamin Chesley, b. 23 Jan 1743, m. ca. 1764 Deborah Randall;
    iv. Sarah Chesley, b. ca. 1747, m. ca. 1768 Israel Randall;
    v.. Mary Chesley, b. 17 Sep 1749, m. ca. 1770 Thomas Crommett;
    vi. James Chesley, b. 25 Jan 1750, d. 13 Jan 1851 at Rochester, NH, m. ca. 1770 Elizabeth Furber;
    vii. Elizabeth Chesley, b. ca. 1752, m. 11 May 1786 Daniel Davis;
    viii. Thomas Chesley, b. 5 Aug 1754;
    ix. Hannah Chesley, b.3 Aug 1756; and
    x. NathanielChesley, b. ca. 1760, d. 13 Apr 1832 at Strafford, NY, m. at Newmarket, NH, 10 May 1781 Hannah Murray (d. 1845 at Strafford, dau. of Timothy & Abigail (Wiggin) Murray).