After being elected President of the Queensland Country Women's Association, Fairfax went on a six month tour of outback Queensland, during which she organised several branches. In 1926 she resigned as President of the Southern Division but remained State President until 1931. In addition to this, she was appointed a Justice of the Peace in 1927.

Visiting England from March 1929 to December 1930, Fairfax represented Australia at the International Conference of Rural Women's Organisations in London in 1929, and on the Liaison Committee of Rural Women's and Homemaker's Organisations. On her return to Australia, she lived in Sydney, New South Wales and continued her work for the Country Women's Association (CWA) as the New South Wales secretary until 1946, as well as fulfilling her role as a vice-president of the Associated Country Women of the World in 1934.

Co-editoring a book with Dorothy Catts entiltled The Countrywoman in New South Wales, Fairfax also served on the boards of the Adult Deaf and Dumb Society of New South Wales, St Luke's Hospital, Darlinghurst, the general council of the Girl Guides Association, was life governor of the Benevolent Society of New South Wales, a trustee of the Public Library of New South Wales and Chairman of the council of the Australian Board of Missions. In June 1935, Ruth Fairfax was appointed O.B.E.

Sources used to compile this entry: Grant, H., 'Ruth Fairfax', in Great Queensland Women, Office for Women, Department of Local Government, Planing, Sport and Recreation, Queensland; Rutledge, M., 'Fairfax, Ruth Beatrice (1878 - 1948)', in Australian Dictionary of Biography Online, Australian National University, Canberra, 2006, http://www.adb.online.anu.edu.au/biogs/A080487b.htm.