Following an appeal by the Parents & Citizens' Association of Coonabarabran Public School to the Minister for Education, Clive Evatt, in late 1941, the NSW Department of Education made the decision to upgrade the existing Coonabarabran Public School (established in 1870) to the status of "Intermediate High School", with the existing school now providing primary and secondary education.[3][4][5] The headmaster of the public school, A. C. Innes, BA, continued as the first headmaster of Coonabarabran Intermediate High School.[6] On 18 March 1942, Minister Evatt formally opened the school, laying a memorial stone to mark the occasion.[7]
In January 1962, a separate "Coonabarabran High School" was established, again separating primary and secondary education between Coonabarabran Public School and the new Coonabarabran High School, respectively.[8] In 1972–1973, a new purpose-built school campus to the south of the public school site was completed.[9] On 16 October 1974, the school was visited by Charles, The Prince of Wales.[10][11][12] In the 2006 Queen's Birthday Honours, the school principal from 1999 to 2006, Michael Robert McEntyre, was awarded the Medal of the Order of Australia (OAM) for "service to secondary education in rural New South Wales and to school sport through Rugby League coaching and administrative roles."[13][14]
^"Coonabarabran Intermediate High". History of New South Wales government schools. NSW Department of Education. Retrieved 19 August 2023.
^"Students and Text Books". The North-western Watchman. Coonabarabran, New South Wales. 30 October 1941. p. 1. Retrieved 19 August 2023 – via National Library of Australia.
^"Evatt, K.C., Opens I.H.S."The North-western Watchman. Coonabarabran, New South Wales. 19 March 1942. p. 1. Retrieved 19 August 2023 – via National Library of Australia.
^"Coonabarabran High". History of New South Wales government schools. NSW Department of Education. Retrieved 19 August 2023.
^"More schools opening early in year". The Sydney Morning Herald. 28 January 1972. p. 8.
^"[Front Cover] THE Australian Women's Weekly". The Australian Women's Weekly. Australia, Australia. 30 October 1974. p. Front Cover. Retrieved 19 August 2023 – via National Library of Australia.
^Nicklin, Lenore (17 October 1974). "The day the stars came down to Siding Spring". The Sydney Morning Herald. p. 1. After a buffet lunch, [the Prince] was driven to the handsome new Coonabarabran High School where over 1,000 children had gathered from neighbouring schools.