Kaimkillenbun is a town and a locality in the Western Downs Region, Queensland, Australia. At the 2011 census, Kaimkillenbun and the surrounding area had a population of 566.It is recognised as the Queensland town with the longest single-word name, but is affectionately known by locals as "The Bun".GeographyKaimkillenbun is 24km from Dalby, on the way to the Bunya Mountains and is part of the Darling Downs.The south-eastern half of the locality is predominantly flat farming land centred on the township. The north-western half of the locality has hills including Squaretop, a mountain of over. Minerals including opals can be found at Squaretop.The Bunya Highway passes through the north-west of the locality.HistoryThe name Kaimkillenbun is believed to derive from an Aboriginal word meaning open mouth, possibly associated with a male initiation ceremony.The Bell Branch railway line from Dalby to Bell was opened in 1906 with Kaimkillenbun being served by railway stations at Kaimkillenbun and Squaretop. The line closed in 1984.An attempt was made to establish a hotel in 1908 but the local temperance lobby managed to prevent it. However, in Ocotver 1911, local farmer Edwin Higgs successfully obtained a licence and built the Kenilworth Hotel. Soldiers leaving for World War 1 signed on the wall of the pub. Today it is known as The Bun Pub.