The editing of a newspaper is a sufficiently exacting piece of work for most people, but Barrow was a man of tireless energy and contrived also to carry out the duties of a member of parliament during nearly the whole of this period. He did not seek re-election for the assembly in 1860 but in 1861 became a member of the South Australian Legislative Council. In 1870 he was one of the South Australian delegates to the intercolonial conference held at Melbourne. In 1871 he resigned from the council, and the following year was returned to the South Australian House of Assembly for Sturt. He joined the seventh Henry Ayers ministry as Treasurer of South Australia in March 1872, holding the position until Ayers resigned in July 1873.