Hirogawa is a town in Arida District, Wakayama Prefecture, Japan. As of 30 November 2021, the town had an estimated population of 6,778 in 2833 households and a population density of 100 persons per km2. The total area of the town is 65.33 square kilometres (25.22 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.