On 1 May 1777 when Jonas was 21, he first married Mehitable Pierce in Spencer, MA. Mehitable died in Spencer, MA on 16 Sep 1802.596

On 25 Aug 1803 when Jonas was 48, he second married Lucretia Smith (58413) , daughter of James Smith (46576) (5 Aug 1728-ca 1756) & Zerviah Hubbard (31 Mar 1732-), in Leicester, MA. Born on 16 Dec 1753 in Leicester, MA.508 Lucretia was baptized in Spencer, MA, on 14 Feb 1754. Lucretia died in Leicester, MA, on 3 Aug 1841; she was 87.