 He was a member of the New South Wales Legislative Council from 1829 to 1844 and died at Newington on 5 August 1845.Blaxland married twice, firstly to Sarah Davies (who died during childbirth) and secondly to Harriott de Marquett, daughter of Jean Louis de Marquett (a Calcutta merchant and a bodyguard of Louis XVI).He was survived by several sons and daughters from his second marriage.