Jonas Leonard first married Wainy Wheelock. Born ca 1793 in Charlton, MA. Wainy died in Spencer, MA on 30 Mar 1852.

On 20 Oct 1852 when Jonas Leonard was 59, he second married Betsey Towne, daughter of Daniel Towne (12 Mar 1771-1808) & Azubah Dagget (15 Mar 1774-6 Jul 1874), in Charlton, MA. Born on 6 Nov 1795 in Vermont. Betsey died in Oakham, MA, on 13 Feb 1890; she was 94. Buried in Northside Cemetery, Charlton.

Betsey first married Albigence Weld, second Jonas Sibley