Mungindi and the surrounding areas were originally inhabited by Aborigines of the Kamilaroi (Gamilaraay) tribe. Their tribal grounds extended from the Barwon River to south of the Namoi River near Gunnedah. Gamilaraay (Gamilaroi, Kamilaroi, Comilroy) is a language from South-West Queensland and North-West New South Wales. The Gamilaraay language region includes the landscape within the local government boundaries of the Balonne Shire Council, including the towns of Dirranbandi, Thallon, Talwood and Bungunya as well as the border towns of Mungindi and Boomi extending to Moree, Tamworth and Coonabarabran in NSW.