The area around Coonabarabran and the
Warrumbungles has been occupied by the
Kamilaroi people for approximately 7,500 years. In 1818, the area was opened up for European settlement, when the
surveyor-general for the
Colony of New South Wales,
John Oxley, made an expedition through the north-west areas of the colony. Oxley surveyed the area around the Warrumbungles mountain range, which he named the "Arbuthnot Range". The former convict, James Weston (1800–1883), who was assigned to the
Cassilis area in the
Upper Hunter Region before being granted his freedom in 1843, acquired the agricultural area known as "Coolabarbyan" in the district in 1843. In 1859, the town was first surveyed by Lewis Gordon, with the first sale of land recorded in 1859. After construction of a new stone courthouse in 1878 the original courthouse was demolished and a post and telegraph office constructed on its site in 1879. The
Coonabarabran Shire was proclaimed on 7 March 1906, with the enactment of the
Local Government (Shires) Act 1905. With incorporation, the town continued to grow with the construction of the
railway line through Binnaway to Coonabarabran in 1917 (extended to Baradine and Gwabegar in 1923) and the establishment of the
Forestry Commission in 1916, both of which facilitated the growth of agriculture and forestry as the primary industries of the region. In 1926–1928, a local committee organised the development of the town memorial to the First World War in the form of the Coonabarabran Memorial Clock Tower at the central town intersection of John Street and Dalgarno Street. Built from local sandstone by Edmund Pye of
Gunnedah at a cost of £1,300, the clock tower was officially dedicated on 23 August 1928 by Major General
Charles Frederick Cox. ==Heritage listings==