On February 13, 2005, Hirukawa, along with the towns of Fukuoka, Sakashita and Tsukechi, the villages of Kashimo and Kawaue (all from Ena District), and the village of Yamaguchi (from Kiso District, Nagano Prefecture), was merged into the expanded city of Nakatsugawa and no longer exists as an independent municipality.
- "中津川市紹介（HP版）07.03.27" (PDF). Nakatsugawa official website (in Japanese). Retrieved August 19, 2011.
- Official website of Nakatsugawa (Japanese)
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