Hidakagawa is a town in Hidaka District, Wakayama Prefecture, Japan. As of 31 October 2021, the town had an estimated population of 9,556 in 4246 households and a population density of 29 persons per km². The total area of the town is 331.59 square kilometres (128.03 sq mi).

Wakayama Prefecture is a prefecture of Japan located in the Kansai region of Honshu. Wakayama Prefecture has a population of 944,320 and has a geographic area of 4,724 square kilometres (1,824 sq mi). Wakayama Prefecture borders Osaka Prefecture to the north, and Mie Prefecture and Nara Prefecture to the northeast.