On April 1, 2005, Hidaka, along with the towns of Kinosaki and Takeno (all from Kinosaki District), and the towns of Izushi and Tantō (both from Izushi District), was merged into the expanded city of Toyooka and no longer exists as an independent municipality.
- Toyooka City Hall statistics 2015 Retrieved 17 June 2015
- Official website of Toyooka (Japanese)
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