The town is named after a pastoral run held by J.D. McTaggart in the late 1850s. The origins of that name are believed to be derived from an indigenous language.
When the construction of a railway line between Brisbane and Gympie was being contemplated in 1884-5, one of the routes being considered was through the Mary Valley. However, this was not the route chosen, and the residents of the valley who were disappointed at missing out on rail connection agitated for many years until the Mary Valley branch line was built. The first section south from Monkland to Kandanga (via Amamoor) was completed in October 1914. The second stage to Brooloo was completed in April 1915. The final stage to Kenilworth was to be built in 1920 but was never completed.
Amamoor has heritage-listed sites, including:
- "Amamoor (entry 492)". Queensland Place Names. Queensland Government. Retrieved 15 March 2014.
- "About MVHR". Mary Valley Heritage Railway. Archived from the original on 25 January 2014. Retrieved 16 March 2014.
- Premier Postal History. "Post Office List". Premier Postal Auctions. Retrieved 10 May 2014.
- ""A"". Opening and closing dates of Queensland schools. Queensland Government. Retrieved 15 March 2014.
- "Welcome to Amamoor State School". Amamoor State School. Retrieved 16 March 2014.
- "Mary Valley Railway Cream Sheds (entry 602792)". Queensland Heritage Register. Queensland Heritage Council. Retrieved 8 July 2013.
- "The Muster Site". Gympie Music Muster. Archived from the original on 16 March 2014. Retrieved 15 March 2014.
- "Amamoor". Queensland Places. Centre for the Government of Queensland, University of Queensland.
- Amamoor State School
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